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习题练习：Physics Unit6: Work and Energy
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 作者: admin  发布日期: 2022-07-28 12:33    总分: 95分  得分: _____________

答题人: 匿名未登录  开始时间: 22年07月26日 13:45  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the correct unit of work expressed g* 4g 5(+)tmerq lkmjm28x wesin SI units?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Can work be done on a sys)ov,-otcjx dye7w cizu )9neb3,+ og 2tem if there is no motion?

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you push twice as hard agam 3)ex+wno -oxinst a stationary brick wall, the amount of work yoe+x3mxown- o) u do

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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 verbd;o1pg 5yp:eh;9tnrtically and is being held there. How much work is being done in holding the box in this positi:;d nbeo; p9pgrt y15hon?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you walk 5.0 m horizontally fp4c)jd p*:mfa orward at a constant velocity carrying a 10-N object, the amount of work you d) pmcaf*jpd4:o is

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A container of water is lifted vertical td)2;v 5kk 1bkfbex+ 1dmafa(ly 3.0 m then returned to its original position. If the total weight is 30 N, how much work wast12;1ba vdakf+kb5dkm)e (xf done?

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Does the centripetal f3k+5 t h0z+hpqifwim.e ikwj+ fcp20 8;sv2z rorce acting on an object do work on the object?

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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 5:,+ ) 5bxonzyxgrmj; sr+r9jzvp4y s( b z:sjgravity while the ball goes up with m xz+rj 9jbzr)+ :;vs4 ,s5yg( ozr:bpjyxsn 5the sign of the work done by gravity while it goes down.

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The area under the curve, ui3yky 3(wis 5on a Force versus position (F vs. x) graph, representski3wy (53s iyu

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  On a plot of Force versus yq+,4a1 n8vahw lba5lqow(v /position (F vs. x), what represents the work done by thenvayvb lowwaahq/(, 4+ q581 l force F?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity $\frac{1}{2} \; mv^2$ is

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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 the object's kinetic eneyrs+ .jyq,. s +.plkuvrgy

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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, then the ob8p5ktf5 a p x3u04bmn;0wpa3iz b ivc)ject's kinetic energy

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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 zer kuz9n,gat a)4o, then the object's kinetic energy

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A truck weighs twice .ia1(wmpzrs ssu6pel). /:g pas much as a car, and is moving at twice the speed of the car. Which statement is true abau.sp(si/:s .zme6 w prgp l)1out the truck's kinetic energy compared to that of the car?

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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 haa* +u ;qjiwxwl4 m.1jhlu,5p*t6n5 *l oy vgthlf the mass of car K. The kinetic energy of car J, compared to caju *hv* 5o4u w+ah5,p lw6tmtjil;*gn .l1qy xr K is

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object hits a wall and bounces back with half owok wt5mlbb.i4yi:c os6 q*pz0env4r2 y.26 tf its original speed. What is the ratio of the final ktqcybpolk .206 .iovmiwy 642btes nw:z4r* 5inetic energy to the initial kinetic energy?

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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 movin+2cg 4g/y( ab4dofoiag at a speed 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 iyo44bf/ 2g + a(goacdmass?

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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 xqtiu3lz1tx, vb2/ 5zmoving with speed 4.0 m/s. Both objects encounter the same cons ,xvz5 3ix ltb/ut12qztant braking force, and are brought to rest. Which object travels the greater distance before stopping?

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You slam on the brakes *olkd 19ta* allb/9 e5 ycgxe.of your car in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, whk*eylxl* tc9.oebaa1d l 59/ gat distance would the car have skidded, under the same conditions?

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A planet of constant mass orbits/7merx(8)wds iqw;n v the Sun in an elliptical orbit. Neglecting any friction effects, what happens to the planet's kinetic energw8 rxds nm /)w7iq(v;ey?

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22#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the work-energy princv sd gwplyqmv/ 4z.,7 t*pj9/siple.
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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity mgy is

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity $\frac{1}{2} \; kx^2$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Is it possible for a system to have ne6r0t6wml (qykgative potential energy?

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is released from restocbzg2x.s55:m umxw(lfms+ t 6 zz s7* a height h above the ground. A second object with four times the mass of the firtzgfl(5+s:uc w z 5xo zms*2m6 7.sxmbst if released from the same height. The potential energy of the second object compared to the first is

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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 end of a spring causes it to stretch 5.0 cm. Ij 5ia5uy * /ksk xqu3w.*saz9wf anothexkuaa3*s5.q kwy* s9u/j5i wzr 0.200-kg mass is added to the spring, the potential energy of the spring will be

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The total mechanical encrk:;yh1 :rr -*pcs 7chd s,uyergy of a system

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An acorn falls from a tree. Compare its kinetic energy K, tol0ii 0-ytgzi93 jlx-v its potential ener-9i v0 -ilxjtyg0il z3gy U.

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Describe the energy of b54+aj2fqsd 1n0 jcejhvg fn6*v p64y a car driving up a hill.

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A lightweight object and a very hm* 9krppgh19e q* tx*jeavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Whichqt*pkjprm eh91*x 9 g* rises to a greater height?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two masses cub(k+zsou 88$m_{1}$ 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?

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33#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the principle of conservationg 50bqk* ldvw; of mechanical energy for conservative forcesbq ;lkw0gd5*v .
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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, through the air 8/ s)wijscbh7(air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of the buildinb7)jw /cs8hisg?

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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 ki ckvx 01(9wq sxa4psh reh.58dnetic energy. Do not ignore air resistance. How much gravit4x1 vh0sakse9w cp(rhx8. q5d ational potential energy did the ball lose?

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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 gravitational potential enup43xg;;lwz lf5s541 k zobzbergy. Do not igz4g bxzw k5sp4 b;3fz 5l1u;lonore air resistance. How much kinetic energy did the ball gain?

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37#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the law of conse,ul-w fs5,lt 6cjk( xurvation of energy.
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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity Fd/t isok1*gm9lbe ) 9joatu *py5 qh+nibd3*

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the correct unit of power ex+oecptz6ip d dhulb/0d l9 9f+my7n 72pressed in SI units?

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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 power?26 3/:r oqd,qq zdsjof

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to yesterday, you did 3 times l02 61ru x:e f;ofgnfkthe work in one-third the time. To do so, your pow:0ofegkx2rlfn 61; f uer output must have been

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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 engax7wm5y0fw,fmz mnw;s, s 52mine must

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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 the object wpj yubhj7e4 67eighs 90 N, jub7hy4 p6ej7how much work was done in lifting it?

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You lift a 10-N physic uzfq 2t q7o89 mmnqfl5z;;5ndn3-sbw jf)0iss book up in the air a distance of 1.0 m, at a constant velocity of 0.50 mn ns;f5mjtq3z -0mds 82wo 7uqifz9q f5b nl);/s. What is the work done by the weight of the book?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulledyipqzr/ wx*qarg7 b nf5c60ihv7h0uyh7;)f/ upward with a constant force of 5500 N for a distance of 50.0u/gh)6a/5 yz0 xhy ff 7pvqiiw c7bn0hq7r*;r m. What is the work done by the 5500 N force?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pullen6 fc/- w3dltoo07(y jpybmc)d upward with a constant force of 5500 N for a distance of 50(b d)3 p7tjo c06-cnw/flmy oy.0 m. What is the work done by the weight of the elevator?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled ummlc,4 rch4x w,1pt,hpward with a constant force of 5500 N for a distance of 50.0 m. What is the, hwmc4l4t,r ch,x1m p net work done on the elevator?

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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 up along ekslh :dyd x7g83i2w2a $37^{\circ}$ inclined plane. What is the work done by the weight (gravitational force) of the box?

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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 down aijy)j2 xn dd712 6j tskr8qss. 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?

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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 qtx;7sb+2t.g e m azx*xak84 ono friction), wx g om bqe+xzk7xa8a t;st42*.ith a force 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?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object -nn,nq,on, gi in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the on q-ongn,,n,ibject moves from 0 to 2.0 m.


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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direa9vbbt7 f pk77ction of the force. The graph in Fig. 6-1 shows the force versus thfab7kb797 v pte object's position. Find the work done when the object moves from 2.0 to 4.0 m.


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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. Thk .p:jpau,o 7hb4wkz; tgmu 6(e graph in Fig. 6-1 showspu;(7h o j.t: w6pgkbumzak,4 the force versus the object's position. Find the work done when the object moves from 4.0 to 6.0 m.


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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 p p61e 86pwyjgg:ph1 3xc64 lqax mvd)force. The graph in Fig. 6-1 shows the force verh gxxm3qpp1) 86:w6je 1p4c lyd6vgapsus the object's position. Find the work done when the object moves from 0 to 6.0 m.


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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force of 200 N is applie g:yiiza-c .ory5c:3vd to move a 55-kg cart (initially at rest) across a or5zc:3 - g:ivy.ycai10 m level surface. What is the final kinetic energy of the cart?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force of 200 N is u ygq 3qmiu3p(3iaz +,applied to move a 55-kg cart (initially at rest) across a 10 m leve3q, 3qiyuaz +pmg 3i(ul surface. What is the final speed of the cart?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-kg mass is moving with 88tu,xv4zmkh h1j/0mys 1tdsv0u k2ga speed of 5.0 m/s. How much work is required to stop the ma4vs/1 hxtkvtkug h00y smu2z,dj8 8m 1ss?

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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 initia/f l q8*m03 rwo orks9fhb8;ywlly moving at 25 m/s, what distance is required to stop a car moving at 50 fwbh 8fqyrr*3 0 ls o/w8o;km9m/s under the same condition?

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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-,qz-j*: th8;,tav bi9g5l7 dak g*bewwjm4 eeg dart. It is cocked by exerting a force of 20 ,:,*5w blhjq -ve8a*4keigtt ab7jz d mgw9 ;eN over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has negligible mass?

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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 of 80 N and a vertical component d 9 xcj2)5sc9o4 fe)j,cmku(p zqf-lqof 60 N. The force is applied to a b(j e fq5 4lx9jc9mc,)kso fu) z2dpq-cox 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?

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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 into a bale of hay, strixen3r ssoa5gt.j8zd vi(t0 82 king the hay with a velocity of 60 m/s. It penetrates at t0e2a8jdsg n 5zr .x3i(8osv depth of 20 cm before stopping. What is the average stopping force acting on the arrow?

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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 (dl6yui4m bl;eyand-g(( j0o7.00 m above a floor to a height of 13.0 m above the floor. What is the change-lg ((oed;6b0nmay jdui (4 ly in gravitational potential energy?

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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 inclined plane. 5np2 zco0oe0 k The plane is 4.0 m long and rises 2.0 m. If the plane is frico zno5c02p0e ktionless, how much work was done by the push?

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-kg mass, hung onto a spring, causes the sprin huqz5 ol:o.xel:ju m,kta 1.1g to stretch 2.0 cm. What is thakuho,elot5l.j1 . qmx::u1ze spring constant?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring is characterized by a springjwisl6f.(6 u 3olyrt o;:ix6 i constant of 60 N/m. How much potential energy does it store, when stretcuxl i3:.;6sfi6w6 irolto( j yhed by 1.0 cm?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Calculate the work required to compress an initially uncompressepeb .yp)rsla9 j-x w*f7 (z tqe3/ri8.tg 4dwcd spring with a spring constant o8.t39z7l.-dwtre w(yq cparief) b4px*/sgj f 25 N/m by 10 cm.

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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 constant 40 N/4h*qfl/3lq vnf t: *f ka6t7olm from x = 0.20 m to 0.25 m? (Assume the unstretched positiol *flk6n7ttv4q/* :ofql3fa hn is at x = 0.)

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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 compressed by 3.0 c+ ,i 6mjsbrz3um. How much work is required to compress the spring an additional 4.0 cm?i6,+z jsrm 3bu

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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 of a 50-m high slou wz3n17ucfz 3pe. What is the speed of the skier on 7 3uznczuf31 wreaching the bottom of the slope? (neglect friction)

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A skier, of mass 40 kg, pushes off the top of a hill with an initial speed of n cyex9 --x,mm4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m in elevx - mxc-my9en,ation?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object slides down a frictionless inclined plane. At the bottom, it has a spdc keie/j yg 1b( v 1,qb0la,-m6rk:tyeed of 9.80 m/s. What is the vertical height of the planebqv6ye ca,dki(/e -g0 blj, mr1ky1t:?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1.0-kg ball falls tog7ff5ixb,r 3: smw5yh the floor. When it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. Hofm7hxfgb5ysrw i5:3, w fast is it moving?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A toy rocket, weighingcimcayn( 5. f( 10 N, blasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical height does it riyanm(5c( fi. cse?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A projectile of mass m leaves the gredxdr:i )yyq,uo +/eaf4b6*z ound with a kinetic energy of 220 J. At the highest point+uz qy*/f4 eax,dy ebdir)o :6 in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch point, did it rise?

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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 bottom of atq. dn*c(fio:y ;hgl;z47y i-d8ppi s dip (See Fig. 6-2). Neglect friction, what will bet yh .o8 i : ;cylf7-g;snidiq4d(zpp* the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?


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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 pon2eij6e/py 5 ic4 sbzhy6)b s0int 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster a/i yhcs)ye6 562 n4episb0 bzjt the top of the next slope, which is 30 m above the bottom of the dip?


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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster star ,bejve+3;3oxvdb,yz jc +v 6ats at a point 30 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the;33vb bj,oxy j6+c,+zdevv ea speed of the roller coaster at the top of the next slope, which is 45 m above the bottom of the dip?


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78#
 
  What is the minimum s)56misiik)e( co ffl, im7ex *peed of the ball at the bottom of its swing (point

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A:2.2 m/s

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80#
 
  难度:2

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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-dy,hn dvac;6 pulled 0.10 m away from the vertical axis and relh dv-; 6a,ncdyeased from rest. What will be its speed at the bottom of its swing?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1500-kg car moving0n+7ydt - q5v 9lpv.f y+nwzs32uiefn at 25 m/s hits an initially uncompressed horizontal spring with spring consta2iqwvflyp .7f9z3n0ds-vne+y t5+ unnt of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

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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 her 2000 kg car to stop fo/vgwg dli/9m (r a red light. What work is done by the friction fgm/ gvw /9ldi(orce against the wheels?

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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 horizontal surface is o6d r+5a1sjz r50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide before coming to a stop?asr 6ojdr+1z 5

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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, level surface. Imaq 5bhz 4 ee-in46juq,zy67ut has 24 J of kinetic energy. The friction force on it is a bz qum 74yjiu64a-z5qehe 6,nconstant 0.50 N. How far will it slide?

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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 mass on a lev vqcgf)*dm o0b 7s-c.)o/uput el surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is movu*p)q0/v-buco)dc7 m sftg o.ed a distance of 10 m, what is the change in its kinetic energy?

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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 ho./d3 5eved 21qnqcg vigh slope. If the work do5en dv. gq2ed vc3oq/1ne by friction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

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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 inclined plane. The plane is 4.0 m lgt;atvt ,lpd +qy2+s yu6*5rtong and rises 2.0 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 aqtv+tp6dutrs5 ;g2t* ly y,+on the box?

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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 .s 1w29gl.x vo, si.zv*ycgvj the top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed of the mas.w.vlj1xog * g9,zi ys2.vcvss after sliding 4.0 m along the plane?

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 30.0-N stone is dro ),th*+lb8bfc:vr jsnpped from a height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. Whatb hr +cfvn)s:8j*,ltb average force of air friction acts on it as it falls?

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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 ru8 r toj( l;ye wr-07v7 j;i5s8dpsb ;7oausuesns up a flight of stairs 10.0-m e ar tlopu5s;yow;8sie7r s7s-7u;0dbv j(j 8high, in
8.00 s?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-N force is needed to move an object with a conyj4 s3m*n9u hbstant velocity of 5.0 m/s. W39 suym*4jbh nhat power must be delivered to the object by the force?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How many joules of energy are us9gn0 8haj hsug /0(jlged by a 1.0 hp motor that runs for 1.0 hr? (1 hp = h9hguj ls8a 0(g 0n/gj746 W)

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cyclist does work at the rate of 500 W while riding. How much force does h:y hkir4 nv5jt *uoeaw f/91,gfap.k-er foot push with when she is traveling at 8.0 m/si/-r w ,9ag.tk4jvf5p1:*k ue ynahfo?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1500-kg car accelerates from 0 t;ie39 ,+c0dnh(dqqai7 zlr pjx2svcoe31 oy* o 25 m/s in 7.0 s. What is the average power deliveredniaq jh0q(eyd;3 piz72c1 *+xo el,o c3s rd9v by the engine? (1 hp = 746 W)

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