Physics Unit6: Work and Energy - 题库网 (tiku.one)

1#

What is the correct unit of work expv kz0w3 nlpod9.u pa7fdq)4bc-i lb5:ressed in SI units?

A.

k g m / s^{2}

B.

k g m^{2} / s

C.

k g m^{2} / s^{2}

D.

k g^{2} m / s^{2}

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本习题练习全部题目来源于题库网 (https://tiku.one)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Can work be done on a s my72c*tjira: /8me vwystem if there is no motion?

A. Yes, if an outside force is provided.

B. Yes, since motion is only relative.

C. No, since a system which is not moving has no energy.

D. No, because of the way work is defined.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you push twice as hard against a65tn )m:fmnm9 cst h9l stationary brick wall, the amount of work yonlf tmn)mt :s6 h599cmu do

A. doubles.

B. is cut in half.

C. remains constant but non-zero.

D. remains constant at zero.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-N object was lifted 2.0 m vertically and is being held there. Hgwu68 om4 kszb;ukw bn /-k(;yow much work is being done in holding the box in to4( kwu ku/y ;k-w bng;b6s8zmhis position?

A. more than 100 J

B. 100 J

C. less than 100 J, but more than 0 J

D. 0 J

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you walk 5.0 m horizontally forward at a constant vc +hwu:(q tsi( l9org7elocity carrying a 10-N objec tu+cgw slqhr((:i9o7 t, the amount of work you do is

A. more than 50 J.

B. equal to 50 J.

C. less than 50 J, but more than 0 J.

D. zero.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A container of water is lifted qo;j4agm 3sc 9j/hv.jvertically 3.0 m then returned to its original position. If the totaljjghvj c.4/;3q aom9s weight is 30 N, how much work was done?

A.

45 J

B.

90 J

C.

180 J

D. No work was done.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Does the centripetal force ac obgn(q6. duy/.xadd)(o n*sjting on an object do work on the object?

A. Yes, since a force acts and the object moves, and work is force times distance.

B. Yes, since it takes energy to turn an object.

C. No, because the object has constant speed.

D. No, because the force and the displacement of the object are perpendicular.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You throw a ball straight up. Compare the sign of the work done by)mcm0nf /1 cc q5-ucqf gravity while the ball goes up with the sign of the work done by gravity whicc01)qcuqfmf -m/ 5cnle it goes down.

A. Work is + on the way up and + on the way down.

B. Work is + on the way up and - on the way down.

C. Work is - on the way up and + on the way down.

D. Work is - on the way up and - on the way down.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本习题练习全部题目来源于题库网 (https://tiku.one)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve, on a Force versus position (F vs. x) 7bg:ag9t j907 ptaq/z4bjyjs graph, represents/9jatgj9by04gq 7:sz7bj apt

A. work.

B. kinetic energy.

C. power.

D. potential energy.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

On a plot of Force versus position (F vs. x), wharue*cqbpk)1)sn /y .mt represents the work done by the f.k cep suqr mny))/1*borce F?

A. the slope of the curve

B. the length of the curve

C. the area under the curve

D. the product of the maximum force times the maximum x

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity

\frac{1}{2} m v^{2}

is

A. the kinetic energy of the object.

B. the potential energy of the object.

C. the work done on the object by the force.

D. the power supplied to the object by the force.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is positive, then tvos)ds.,d:aqgi dh ht-(6pt( he object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本习题练习全部题目来源于题库网 (https://tiku.one)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is negative, t8cmd-dpc 82zf d7+at ghen the object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the net work done on an object is zero, then - if +z4c7pje(+p fusathe object's kinetic energy

A. decreases.

B. remains the same.

C. increases.

D. is zero.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A truck weighs twice as much v*f)c(w fjlxnsj m6+- x6 z;gsas a car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to that ofgjzsf j-f6xs lw)xnv(m6*+ c; the car?

A. All that can be said is that the truck has more kinetic energy.

B. The truck has twice the kinetic energy of the car.

C. The truck has 4 times the kinetic energy of the car.

D. The truck has 8 times the kinetic energy of the car.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Car J moves twice as fast as car K, and car J has half the4e8j6ysk(8at5di *4yg i avyj cfr)c2 mass of car K. The kinetic kagedsiy ) y j68(58jcyf42a4rc vt*i energy of car J, compared to car K is

A. the same.

B. 2 to 1.

C. 4 to 1.

D. 1 to 2.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本习题练习全部题目来源于题库网 (https://tiku.one)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object hits a wall and bounces bacey+ s xqn*aq0n6d 0/dck with half of its original speed. What is the ratio of the final kinetic energy to the initial kieqyd c*ns/ad0n+x6 0q netic energy?

A. \frac{1}{2} \;

B. 1/4

C. 2

D. 4

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A brick is moving at a speed of 3 m/s and a pebble is moving at a sp9tk;w2a3npmom0u)xmm( p i3 tyk 7b hcrh44s9eed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to the rock's mam t7mkkb4mwxh;u0r) o 2tmynp9 3 h (s4ca3i9pss?

A. 25 to 9

B. 5 to 3

C. 12.5 to 4.5

D. 3 to 5

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本习题练习全部题目来源于题库网 (https://tiku.one)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-kg mass is moving with speed 2.0 m/s. A 1.0-kg mass is moving withzs4 lv 7uoh59 ixhd-nr+ed8u* speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the gshvr 7dx 4ziluu 8n9h e-5+o*dreater distance before stopping?

A. the 4.0-kg mass

B. the 1.0-kg mass

C. Both travel the same distance.

D. cannot be determined from the information given

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You slam on the brakes of your car in a panic, a+k7wa le03 he1m;jadbnd skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded,07ajwkah 1 de;l+3 bem under the same conditions?

A. It would have skidded 4 times farther.

B. It would have skidded twice as far.

C. It would have skidded 1.4 times farther.

D. It is impossible to tell from the information given.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A planet of constant mass orbits themf)nwa+x lwi7s-x9zcl ++km . Sun in an elliptical orbit. Neglecting any friction effects, what happens to the9 ikmxc +zla )f- ls++xm7ww.n planet's kinetic energy?

A. It remains constant.

B. It increases continually.

C. It decreases continually.

D. It increases when the planet approaches the Sun, and decreases when it moves farther away.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本习题练习全部题目来源于题库网 (https://tiku.one)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

22#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the work-energy pr sdl iq43.yzoa1j*3og inciple.

该题自我估分: (必填) (满分:1.0分)

绑定到本题的附件链接:
绑定到本题的上传图片: (问答题类型题目图片/附件必须插入上方文本框，否则会被移除题目绑定)

参考答案:

进入本题讨论区，参与讨论

本习题练习全部题目来源于题库网 (https://tiku.one)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity mgy is

A. the kinetic energy of the object.

B. the gravitational potential energy of the object.

C. the work done on the object by the force.

D. the power supplied to the object by the force.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity

\frac{1}{2} k x^{2}

is

A. the kinetic energy of the object.

B. the elastic potential energy of the object.

C. the work done on the object by the force.

D. the power supplied to the object by the force.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本习题练习全部题目来源于题库网 (https://tiku.one)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Is it possible for a syste45kq0fsw72hci d mji b0 ou6w8ga;y )ym to have negative potential energy?

A. Yes, as long as the total energy is positive.

B. Yes, since the choice of the zero of potential energy is arbitrary.

C. No, because the kinetic energy of a system must equal its potential energy.

D. No, because this would have no physical meaning.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is released from rest a height h abox5ydwcpdxi(w p 58h 7aag6 3r7ve the ground. A second object with four times the mass of the first if released from the same height. The potential energy of the second object compared to the first 83h(7 d 7rw5 5wgpy6aad pixcxis

A. one-fourth as much.

B. one-half as much.

C. twice as much.

D. four times as much.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.200-kg mass attached to the en9 dx 8uzc+otks wr57/fd of a spring causes it to stretch 5.0 cm. If another9fx8cs/ 7+ rwkuoz5 dt 0.200-kg mass is added to the spring, the potential energy of the spring will be

A. the same.

B. twice as much.

C. 3 times as much.

D. 4 times as much.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The total mechanical energy o:c l o6;n8oxlrf a system

A. is equally divided between kinetic energy and potential energy.

B. is either all kinetic energy or all potential energy, at any one instant.

C. can never be negative.

D. is constant, only if conservative forces act.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本习题练习全部题目来源于题库网 (https://tiku.one)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An acorn falls from acoo./n0 q7pxk*+fxt z tree. Compare its kinetic energy K, to its potential ener/k po0+ft znq7co*. xxgy U.

A. K increases and U decreases.

B. K decreases and U decreases.

C. K increases and U increases.

D. K decreases and U increases.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Describe the energy of a car driving up a0onau 2p4. vo*6qbn ql hill.

A. entirely kinetic

B. entirely potential

C. both kinetic and potential

D. gravitational

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lightweight object.fdy/(pg4 km1r8i )25ypfn0oa* j.f puegnky and a very heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionlyfiu1k.8 mp ff ry dj05 2)oe*(./pgnapn4 kgyess hill. Which rises to a greater height?

A. The heavy object, because it has greater kinetic energy.

B. The lightweight object, because it weighs less.

C. They both slide to the same height.

D. cannot be determined from the information given

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本习题练习全部题目来源于题库网 (https://tiku.one)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two masses :f05nplv a5te

m_{1}

and

m_{2}

at the top of two frictionless inclined planes. Both masses start from rest at the same height. However, the plane on which

m_{1}

sits is at an angle of

30^{\circ}

with the horizontal, while the plane on which

m_{2}

sits is at

60^{\circ}

. If the masses are released, which is going faster at the bottom of its plane?

A.

m_{1}

B.

m_{2}

C. They both are going the same speed.

D. cannot be determined without knowing the masses

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本习题练习全部题目来源于题库网 (https://tiku.one)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

33#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the principle of conservation of mechanical energy for conservative for-jky( :uu 42aycy; tkqces.kuc24 (uty :k;ay- qjy

该题自我估分: (必填) (满分:1.0分)

绑定到本题的附件链接:
绑定到本题的上传图片: (问答题类型题目图片/附件必须插入上方文本框，否则会被移除题目绑定)

参考答案:

进入本题讨论区，参与讨论

标记此题

34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball falls from the top of a building,c av8 *yy6s ekr v2pz6xr-mryuh4;c07 through the air (air friction is present), to the ground below. How 4r 7c 6z*0ys ma-ecyxvk6rpv8y2 h;rudoes the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of the building?

A. K is equal to U.

B. K is greater than U.

C. K is less than U.

D. It is impossible to tell.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and gains 30 J of kine+ /rn74s f,qmzt,ogbn95e o)g( rb shztic energy. Do not ignore air resistance. How much gravitational potential energy did the bal(7,4oe/ mrqz9gz+bh,sfng ro b t) sn5l lose?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball drops some distance and loses 30 J of gravp15 7ul5+q /uw:wne uelxs e)aitational potential energy. Do not ignore air resistance. How much kinetic energy did the ball gai /7w5+asuexupeq)l 5u wle1:nn?

A. more than 30 J

B. exactly 30 J

C. less than 30 J

D. cannot be determined from the information given

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

37#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conservation of enetq i:1s .ls to1otdq6)rgy.

该题自我估分: (必填) (满分:1.0分)

绑定到本题的附件链接:
绑定到本题的上传图片: (问答题类型题目图片/附件必须插入上方文本框，否则会被移除题目绑定)

参考答案:

进入本题讨论区，参与讨论

标记此题

38#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The quantity Fd/t isxey mamxh1j e- k8,, 9guc*kqb2fw7b,

A. the kinetic energy of the object.

B. the potential energy of the object.

C. the work done on the object by the force.

D. the power supplied to the object by the force.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the correct utk8*rbtn(z3cr sr2g8 nit of power expressed in SI units?

A.

k g m / s^{2}

B.

k g m^{2} / s^{2}

C.

k g m^{2} / s^{3}

D.

k g^{2} m / s^{2}

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Of the following, which is not a unit of ; imhxgv ah86r4+a,eqjdzn04 power?

A. watt/second

B. newton-meter/second

C. joule/second

D. watt

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Compared to yesterday, you did ke2-(nhe szcf4q 3xu/ xiw)r9wea6q 43 times the work in one-third the time. To do so, your power outqz24 x4k96 fer)xihs q/ne3- u(waew cput must have been

A. the same as yesterday's power output.

B. one-third of yesterday's power output.

C. 3 times yesterday's power output.

D. 9 times yesterday's power output.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本习题练习全部题目来源于题库网 (https://tiku.one)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

To accelerate your car at a constant acceleration, the car's eov eom gjt51-amf8//rngine must

A. maintain a constant power output.

B. develop ever-decreasing power.

C. develop ever-increasing power.

D. maintain a constant turning speed.

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is lifted vertically 2.0 m and held there. If )-/, d7fg(tex: ouktl(zbob gthe object weighs 90 N,/(t7 gb,k(l gx) ofzdbeot:u- how much work was done in lifting it?

A.

360 J

B.

180 J

C.

90 J

D.

0 J

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You lift a 10-N physics book up in the air a distance of 1.0 m, at a t -m ik4pt*) 9)zxzohnconstant velocity of 0.50 m/s. What is the work done by the weith k)) xmp9o-nizz t*4ght of the book?

A. +10 J

B. -10 J

C. +5.0 J

D. -5.0 J

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force of 5500 N for a distah+y20utyb)tg;a6iko;i0 e0 f m.tludnce of 50.0 m. Wtbmy6ytie.u;0 ig t0 l20u;o) akhdf+hat is the work done by the 5500 N force?

A.

2.75 \times 10^{5} J

B.

- 2.45 \times 10^{5} J

C.

3.00 \times 10^{4} J

D.

- 5.20 \times 10^{5} J

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constan 48bkf ;:lr/h.cxkecwt force of 5500 N for a distance of 50.0 m. What is the work done by the weight of 4ckcf : x/wehr8l ;k.bthe elevator?

A.

2.75 \times 10^{5} J

B.

- 2.45 \times 10^{5} J

C.

3.00 \times 10^{4} J

D.

- 5.20 \times 10^{5} J

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本习题练习全部题目来源于题库网 (https://tiku.one)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 500-kg elevator is pulled upward with a constant force ofoox0/0 sn-vplkt8 mn2 5500 N for a distancnx l02 v0k-n/ost8po me of 50.0 m. What is the net work done on the elevator?

A.

2.75 \times 10^{5} J

B.

- 2.45 \times 10^{5} J

C.

3.00 \times 10^{4} J

D.

- 5.20 \times 10^{5} J

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30-N box is pulled 6.0 m p2y zo7 cn91qpdglv wm/0 j*i b6/:qzqe8t7ti up along a

37^{\circ}

inclined plane. What is the work done by the weight (gravitational force) of the box?

A.

- 11 J

B.

- 1.1 \times 10^{2} J

C.

- 1.4 \times 10^{2} J

D.

- 1.8 \times 10^{2} J

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg box of fruit slides 8.0 m xfp0pzkhrkt,e6 47/4ljg e2tev -tj0down a ramp, inclined at

30^{\circ}

from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

A.

157 J

B.

- 157 J + 78.4 J

C.

78.4 J

D.

- 78.4 J

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本习题练习全部题目来源于题库网 (https://tiku.one)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Matthew pulls his little sister Sarah in a sled on an icy surface (assume 2lpo 3 uso44d;lu5yylb /ttr7 no friction), with a u3spdy2r4boou57;t l l yt/4lforce of 60.0 N at an angle of

37^{\circ}

upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

A.

185 J

B.

433 J

C.

575 J

D.

720 J

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本习题练习全部题目来源于题库网 (https://tiku.one)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. c940plphuztuv. sj0 7The graph in Fig. 6-1 shows the force versus the object's position. F4.u 00tvphp 7j zcu9lsind the work done when the object moves from 0 to 2.0 m.

本题所包含的其它图片:

A.

20 J

B.

40 J

C.

60 J

D.

80 J

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. Thxvq0)lrss ,c59 xa/hvx;zv et plq8,)e graph in Fig. 6-1 shows the force versus the object's position. Find the work done when t9tc v/xl e,ql,r0sxz v8v) s)a5qpx;hhe object moves from 2.0 to 4.0 m.

本题所包含的其它图片:

A.

20 J

B.

40 J

C.

60 J

D.

80 J

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graphe9k5s sfj u0l00.0pvxao4 q pi in Fig. 6-1 shows the force versus the object's position. Find the work v90o0upeqkxj0s 5 4 .0s lfaipdone when the object moves from 4.0 to 6.0 m.

本题所包含的其它图片:

A.

20 J

B.

40 J

C.

60 J

D.

80 J

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force moves an object in the direction of the force. The graph in Fv g02b*hwaqfqllp +aa89; ;wqig. 6-1 shows the force versus the object's position. Find the work done0v g;a2w*lqlpaf9qw +;ab qh8 when the object moves from 0 to 6.0 m.

本题所包含的其它图片:

A.

20 J

B.

40 J

C.

60 J

D.

80 J

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 200 N is applied to move a 55- wg ,o5tw0mgs.ju1z0vkg cart (initially at rest) across a 10 m level surface. What is the final kinetic energy of the ca0w5j gswzu.o 0gt1,v mrt?

A.

1.0 \times 10^{3} J

B.

2.0 \times 10^{3} J

C.

2.7 \times 10^{3} J

D.

4.0 \times 10^{3} J

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A horizontal force of 2-mbj+9kixc;8pil x os 88*w akr5(lcj1 y +uej00 N is applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final speed of the c8imeip5* rlxkxlc oa9wcbu1(+-8j8jk+jy s ;art?

A. 73 m/s

B. 36 m/s

C. 8.5 m/s

D. 6.0 m/s

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本习题练习全部题目来源于题库网 (https://tiku.one)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass is moving with a speed of 5.0 m/s. How mmozyo1s+h)tyb /a1 +duch work is required to stop to )/y+1md1 habz so+tyhe mass?

A.

50 J

B.

75 J

C.

100 J

D.

125 J

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If it takes 50 m to stop a car initially moving at 25 m/s, what dpd;c9r c5sj6( yd,ee zistance is required to stop a car moving at 50 m/s undery;sp er cd(6jc59, dze the same condition?

A.

50 m

B.

100 m

C.

200 m

D.

400 m

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring-driven dart gun propels a 10-g dart. It is cocked ,e30d:gm.p q 3sqxedcby exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assqde.q0d3g,:c x3pe msuming the spring has negligible mass?

A. 10 m/s

B. 14 m/s

C. 17 m/s

D. 20 m/s

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本习题练习全部题目来源于题库网 (https://tiku.one)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-N force has a horizontal component d++ip- l8d lghof 80 N and a vertical component of 60 N. T+8l ld+pg-d hihe force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is the cart's final kinetic energy?

A.

200 J

B.

160 J

C.

120 J

D. zero

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An arrow of mass 20 g is shot horizontally io 2m62m siq 8kte(/k6+ o a.qpejkwr2ynto a bale of hay, striking the hay a(t8y.me 2 ro6+kqepo2q62/i wks mjk with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force acting on the arrow?

A.

45 N

B.

90 N

C.

180 N

D.

360 N

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 15.0-kg object is moved from a height of 7.00 m above 6ylbykx igp*rso14o, : 0j;nmicgd82a floor to a height of 13.0 m ab2pk or;1i4 idysmc*j6nby:x ,o8lg 0gove the floor. What is the change in gravitational potential energy?

A. zero

B. 1030 J

C. 1176 J

D. 1910 J

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本习题练习全部题目来源于题库网 (https://tiku.one)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 400-N box is pushed up an rsmddw*t.7u5il i,s8to r u 3 8ry/hi9inclined plane. The plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work was done by the push 9u/ytrstlhm i53sirud7i *,dwr8 o 8.?

A.

1600 J

B.

800 J

C.

400 J

D.

100 J

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本习题练习全部题目来源于题库网 (https://tiku.one)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-kg mass, hung onto/sinv0lumi eb001hcu47(lqx) mjxa 1 a spring, causes the spring to stretch 2.0 cm. What is the spring l sx/uq7a0xcm 1ium0 (lh1ienv04jb)constant?

A.

4.9 \times 10^{3} N / m

B.

5.0 \times 10^{3} N / m

C. 20 N/m

D. 2.0 N/m

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring is characterized by a spring con1x7 w b7qt-3zx24detfhxyz2 jstant of 60 N/m. How much potential energyq4hy17 w723zdtbte-jxz x2 fx does it store, when stretched by 1.0 cm?

A.

3.0 \times 10^{- 3} J

B.

0.30 J

C.

60 J

D.

600 J

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Calculate the work required to compress an initialev,7ta18xg jw5 bce ch(f/v;qly uncompressed spring with a spring consttq1jwaec;f(c e , hv85 7xg/bvant of 25 N/m by 10 cm.

A.

0.10 J

B.

0.13 J

C.

0.17 J

D.

0.25 J

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What work is required to stretch a spring of spring cons; s5bs fo (2h)tefoeg:tant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position h)tbfessg: 25;o fe o(is at x = 0.)

A.

0.45 J

B.

0.80 J

C.

1.3 J

D.

0.050 J

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spring with a spring constant of 15 N/m is initially colk8 no/p,.ch/qbc em4mpressed by 3.0 cm. How much work is rl4 8nk/h,c mq.bec /opequired to compress the spring an additional 4.0 cm?

A.

0.0068 J

B.

0.012 J

C.

0.024 J

D.

0.030 J

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top o(uzm 4d/ au8kif a 50-m high slope. What is the speed of the skier on4/d8aum(z iku reaching the bottom of the slope? (neglect friction)

A. 22 m/s

B. 31 m/s

C. 38 m/s

D. 41 m/s

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A skier, of mass 40 kg, pus1qc7qqoauy2i. )jck )hes off the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after droc2i .)y) qc aq7oq1jkupping 10 m in elevation?

A. 7.3 m/s

B. 15 m/s

C. 49 m/s

D. 196 m/s

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本习题练习全部题目来源于题库网 (https://tiku.one)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object slides down a frict-vt )xj.b)v:.c 7lhe;fbm jc4ldup8v ionless inclined plane. At the bottom, it has a speed of 9.80 m/s. W f.cxh.u) bjcl v4vmpd7jlev)t -;:b8hat is the vertical height of the plane?

A.

19.6 m

B.

9.80 m

C.

4.90 m

D.

2.45 m

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.0-kg ball falls to the floor. When it is 0.70 m above the floop 3k0(*/we .hp,0w olsbl hf e:qga8wur, its potential energy exactly equals its kinetic energyappw 0gb,(/ok w:eslquf8wl.e 03*hh . How fast is it moving?

A. 3.7 m/s

B. 6.9 m/s

C. 14 m/s

D. 45 m/s

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, weighing 10 N, blasts straizmbr( katfw5gup1 u, z.(g**zght up from ground level with a kinetic energy of 40 J. At the exact top of its trajectouktzfab(5 m*gur(p1 ,.gz w*z ry, its total mechanical energy is 140 J. To what vertical height does it rise?

A.

1.0 m

B.

10 m

C.

14 m

D.

24 m

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A projectile of mass m leaves the gri.tz;*g7eb k 6cx3q 2lkvf-1igbw iu.ound with a kinetic energy of 220 J. At the highest point in its trajectokc g37bvixgiib6 l;f .z 2wt.qku*-1ery, its kinetic energy is 120 J. To what vertical height, relative to its launch point, did it rise?

A.

\frac{220}{m g} m

B.

\frac{120}{m g} m

C.

\frac{100}{m g} m

D. Impossible to determine without knowing the angle of launch

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts from rest at a point 45 m above the bo*w1tm+/ v(s2s 8ef.e +u1tyn vdfluwittom of a dip (See Fig. 6-2). Neglect frictitmw+ /vuffytl+.d(s2e *nus1ev8 w1ion, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 17 m/s

C. 24 m/s

D. 30 m/s

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts with a speed of 5.0 m/s at a point 45 m above the botw, altob,2 mh)z gv,x:tom of a dip (See Fig. 6-2). Neglect friction,h bv lztw2,:x,ogma), what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?

本题所包含的其它图片:

A. 12 m/s

B. 14 m/s

C. 16 m/s

D. 18 m/s

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A roller coaster starts at a point 30 m above the bottom of a dip with a speedsvp2 vv9wyrcpa7)sw* c*kb*g1 kqd6 ( of 25 m/s (See Fig. 6-2). Neglect friction, p* wva c69brsdskvg(pwqc*27*k y 1v)what will be the speed of the roller coaster at the top of the next slope, which is 45 m above the bottom of the dip?

本题所包含的其它图片:

A. 14 m/s

B. 16 m/s

C. 18 m/s

D. 20 m/s

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本习题练习全部题目来源于题库网 (https://tiku.one)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

78#

( 1.0 分) 切至整卷模式搜藏此题

What is the minimum speed of the balup *v ez.98m)d edcl2il at the bottom of its swing (point

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A:2.2 m/s

A. 3.1 m/s

B. 4.4 m/s

C. 4.9 m/s

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

80#

( 1.0 分) 切至整卷模式搜藏此题

难度:2

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2-kg pendulum of length 50 cm is pulledod mcu6 wgah0t)+;/1 cya..wku rpch - 0.20 m away from the vertical axis and released from rest. What will be its speed at the bottom of its swi6o)kc/. ;wg1upam+ar u h dcw ty0ch-.ng?

A. 0.2714 m/s

B. 0.724 m/s

C. 1.085 m/s

D. 0.905 m/s

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car moving at 25 m/s hits an initially uns.lv6 6h-;7 o opqn0w2b lf8mvjcv/upcompressed horizontal spring .p f;sou n6c0vwjlh8672b-mlpo/vv q with spring constant of

2.0 \times 10^{6} N / m

. What is the maximum compression of the spring? (Neglect the mass of the spring.)

A.

0.17 m

B.

0.34 m

C.

0.51 m

D.

0.68 m

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A driver, traveling at 22 m/s, slows down hg8p0cm o p1isc9m,m/.da :rmf er 2000 kg car to stop for a red light. What work is done by the friction force rma .cds0 fpi8m g:m/p1,mc o9against the wheels?

A.

- 2.2 \times 10^{4} J

B.

- 4.4 \times 10^{4} J

C.

- 4.84 \times 10^{5} J

D.

- 9.68 \times 10^{5} J

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The kinetic friction force between a 60.0-kg object and a hori +p. gajtbfaoj1*9eyeuj 4pza6;el.ub )y,* vzontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what dpaepb).e 4ego; zujj,tj*.y l*9yv+au1 6bf aistance will it slide before coming to a stop?

A.

15.0 m

B.

30.0 m

C.

375 m

D.

750 m

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 12-kg object is moving on a rough, lev(zrt9uccm) i1rxsq*if8+(mz el surface. It has 24 J of kinetic energy. The friction force on t1f xq9(i m8z(rs + rumc)c*ziit is a constant 0.50 N. How far will it slide?

A.

2.0 m

B.

12 m

C.

24 m

D.

48 m

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A force of 10 N is applied horizontally to a 2.0-kg mq1xctnq g6e ;l*sk*/k ass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a tg x**6 kk/c e;qqnls1distance of 10 m, what is the change in its kinetic energy?

A.

20 J

B.

39 J

C.

46 J

D.

61 J

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg skier starts from rest from the top of a 50-m high slop3 .l 8pgjaoqjwi7bl )m fd)+- gn(tul/e. If the work done by gwotg lj(.naq3f +m)diu) l/bl8 j-7pfriction is

- 6.0 \times 10^{3} J

, what is the speed of the skier on reaching the bottom of the slope?

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An 800-N box is pushed up an il, :rmgor 0m k0 r:rfv+mpbnfs* h6f+3nclined plane. The plane is 4.0 m long and rises 2.0fr0s flhmrr6+*fm: 0op bvrg:,k+m3n m. It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of the average friction force on the box?

A.

0 N

B. non-zero, but less than 400 N

C.

400 N

D. greater than 400 N

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass is released from rest at the top of a plane inclined at 20e ab1m ;msv;3jyvm d+.2ks78 xvy hijfsc4ove horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed of the mass after sliding m481yj 3smmvx7vsyv+s . jh fdi k;c;24.0 m along the plane?

A. 2.2 m/s

B. 3.0 m/s

C. 3.5 m/s

D. 5.2 m/s

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 30.0-N stone is dropped from a height of 10.0 m, and strikes the groun x13j09:*tjlkkdikl ad with a velocity of 7.00 m/s. What average force of air friction acts on it :j dikjlakt90kl x3* 1as it falls?

A.

22.5 N

B.

75.0 N

C.

225 N

D.

293 N

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

本习题练习全部题目来源于题库网 (https://tiku.one)，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

标记此题

91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

At what rate is a 60.0-kg boy using energy when he runs up a flight of stairs 10j b;y7k cp/n3r.0-m high,;jc/ b3rkynp 7 in
8.00 s?

A.

75.0 W

B.

735 W

C.

4.80 k W

D.

48 W

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10-N force is needed to mo( cp5- vgmu6tg hu 6vug5(8qfqve an object with a constant velocity of 5.0 m/s. What power must be delivered to the object bvfqq u thp (u(gmu5gv6- c56g8y the force?

A.

0.50 W

B.

1.0 W

C.

50 W

D.

100 W

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How many joules of energy are used by ab5f:t s u4b:sk s btie7t/)wh+ 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 W)bkt7thi: )b: tfe5s4u+ /ssb w

A.

3.6 \times 10^{3} J

B.

2.7 \times 10^{6} J

C.

4.5 \times 10^{4} J

D.

4.8 J

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A cyclist does work at the rated9 0flb6vl: wqc* re3xh5 n4zl of 500 W while riding. How much force does her 4r0vnq6lhwf:3 eb c9 dxz*ll5 foot push with when she is traveling at 8.0 m/s?

A.

31 N

B.

63 N

C.

80 N

D.

4000 N

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

标记此题

95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. What is the average 26j*a)2c wnz d;wgw mnpower delivered by the engi g wd)*2zwcjnm a6n2;wne? (1 hp = 746 W)

A.

60 h p

B.

70 h p

C.

80 h p

D.

90 h p

绑定到本题的附件链接:
绑定到本题的上传图片:

参考答案:

进入本题讨论区，参与讨论

账号		自动登录	找回密码
密码			立即注册

未使用图片

本次作答已使用

1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72	73	74	75	76	77	78	79	80
81	82	83	84	85	86	87	88	89	90
91	92	93	94	95

1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72	73	74	75	76	77	78	79	80
81	82	83	84	85	86	87	88	89	90
91	92	93	94	95

1	2	3	4	5	6	7	8	9	10
11	12	13	14	15	16	17	18	19	20
21	22	23	24	25	26	27	28	29	30
31	32	33	34	35	36	37	38	39	40
41	42	43	44	45	46	47	48	49	50
51	52	53	54	55	56	57	58	59	60
61	62	63	64	65	66	67	68	69	70
71	72	73	74	75	76	77	78	79	80
81	82	83	84	85	86	87	88	89	90
91	92	93	94	95