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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 in S*p idsla2vq 46I 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 system if there is no pgj n,6b6s-odmotion?

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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 against a stationary brick wall, the amount o4p) m jvktam3 n/ m(e:d3kzt4af work youm:vazep m3d 4/tn4 )mt a3kk(j 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 vertically and is being held there. How csc94:psw7cm much work is beingcs swc mcp9:47 done in holding the box in this position?

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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 forwarj7 p5e,wflleoq;2q/z q7r/e gap9/e g d at a constant velocity carrying a 10-N obj/goap7ewerfl g7q 5e/e9 qqz2 l/,p;ject, the amount of work you do 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 verticall,) ftaj (j jtoh+9azn2y 3.0 m then returned to its original postj9t+)h, af(oz2j janition. If the total weight is 30 N, how much work was 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 fopfgdc+m/el3kp ,evm0u 6)(g6m m n am0rce 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. C6 ie 8dhd/h7. 4ebilqpompare the sign of the work done by gravity while the ball g/4hidq7ebhlde8 6.i poes up with the 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, on a Force versus position (F vs. x) graph,.boo6mdapvmg1; 0 /7le u-gjj representsoaedj601-.jgp7ogm;bml/v u

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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 position (F vs. x), what represents the wp 1v1pn;ei:jpg2)vum a j(xnau/b q63ork done by the force F?;a)g:36v m2 xevi/n1 bapqunu j1(ppj

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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 kij- ;bw zwmz y3kqpao9* o6w.z6netic energy

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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 object's 5g xo84oati8tkinetic 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 zero, v2r4+ vb5npvothen 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 as much as a car, andiq;j7iy3h fin, hyfl xk 0;*v6 is moving at twice the speed of the car. Which statemel0hy7 6fi hqfn ;v3jxi*,iyk; nt is true about 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 dyl8b3s t us7 ;prun74car J has half the mass of car K. The kinetic energy of car Jd8usy4;bnul 37s7tr p , compared to car 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 bwzgmdgi**p,f.i2dbc cz/;rao ci ( 80 ounces back with half of its original speed. What is the ratio of the final kinetic energy to the initial kinetic eneir gmpid0f/o i.28c dgw*bza* ( zcc;,rgy?

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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 me gm7xbz3; 2jw9,lzdp oving at a speed of 5 m/s. If both objects have the same kineti;9w2jzdbmx, g e7plz3c energy, what is the ratio of the brick's mass to the rock's mass?

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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 2.00uq 0 29szc pr2p)8kcahbj iw1 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which obz9hk pca up bqir0sc 22)j1w08ject 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 of your car in a panic, and skid a certain distance ou4v738+ m vsclbmxsb(n a straight, level road. If you had been traveling twice as fast, what distance would the car have skidde4 x(lvc3s7b+bu s vmm8d, 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:/hv dca*qa ,nd1: ceq orbits the Sun in an elliptical orbit. Neglecting any friction effects, what happens to the planet's kindcqq1ca /e* :hd,avn :etic energy?

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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 princips9 l ((nig:zaczb8 3ahle.
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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 negative potentiz56btw7w-l- qqse xmyni 9 i:7al 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 fromxbd gf-n c;no t*(g;v1nb96s w rest a height h above the ground. A second object with four times the mass of the first ib;ng;-vod9xngc*1 (s6tw f bnf 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.izq/a xtnz5.0 cm. If another 0.200-kg mass is added to the spring, the potential ene .5qz/tzni ;axrgy 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 enerc dsla*q-.ny 0gy 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. Cou,7)bo; h (kfv8eg lzbmpare its kinetic energy K, to its potential energy U k;ogzev,fu 7)(8 lhbb.

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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 a car driving up a hill.t v+q5 (;4bi;xf;cul ey2fs kl

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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 heavy rp 2fwtap/x xpo4-+a,.x r7iw object are sliding with equal speeds along a level frictionless surface. Tfrxp.ar i4op,-t 7xxww +p /a2hey both slide up the same frictionless hill. Which 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 i 8knp3tif /(b$m_{1}$ 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 conservat t*8kkjqzy;h7o .+o ysion of mechanical energy for conservative forces.sqh8z ;t+okj .k7yyo*
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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 (air friction is p6m ) ..1swif(yismuz5) 3n dzc)r ujvaresent), to the ground below. How does the kinetic energy (K) just before striking the ground compare )w.c(i53vu) r ausnz1. fj dm6zmy)sito the potential energy (U) at the top of the building?

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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 kinetic energy. Do not ignore ai-vb xi2rh d-21i)bke3h+w xpqr resistance. Hoki2x1)-i-p3q2b hv b x wrdhe+w much gravitational 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 gravag):uhkieh k 0xr5dd3fdx+/(itational potential energy. Do not ignore airi3)k +(/e5f uh:dhxdkadr 0x g 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 conservation of enen.15t i4rf z2ry/ hnsnd,ej6z rgy.
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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 is l+;e p,7wc8sai;*rzu2e eblr

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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 expressed iny6u 1vq3-e rcs 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 a4l5gs;ddg v/i unit of power?

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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 the work in one-third the time. To do soh:m k4((a mypx3y*3p(t irnsu, your power output must have beetxs nmah :3 m *yp(k(y4ir(3upn

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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 khntw4 fkc b; svf)f(6b66g ,wa constant acceleration, the car's engine 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. ad( y/vkk9o np03 b9zh If the object weighs 90 N, how muczdp9yh(0vo3k 9 a n/bkh 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 physics book up in the a0.z++- (vxwqdrz z ttihy2 lq)ir a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work do.0+rdl v+t2qixzqz )t -hyw (zne 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 pulled upward with a constant force obiq /,w+d 8uc*8jwywf f 5500 N for a distance of 50.0 m. What is the+8/ywwu q wf 8i,*jbdc 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 pulled upward with a constant eipyz4-f 4.s fforce of 5500 N for a distance of 50.0 m. What is the work do4 yfpizfs -e4.ne 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 upward with a constant force of 5500 N fors6r)zmiy9ym gbp) u8pa 5d)5d a distance o9)rdy)agsm5)6 dzpm 5p 8yi buf 50.0 m. What is the 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.ouui;w /e-d)a 8lhd( a;3bmrb0 m up along a $37^{\circ}$ 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 dfh3 dt::et,p.0 m down 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?

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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 no fr,e,rt6mcq6 leiction), with a force of 60.0 N at an ,qt 66m ceelr,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 in the direction o p6;e)2pz5, uh.x:erm poank if the force. The graph in Fig. 6-1 shows the f e,popkm az:2u6xpne.;5rih)orce versus the object's position. Find the work done when the object 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 direction of theyh 0i:okg(z il5b 9rky*a i0z) force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done :l9zoy)i5ahg0(yr0k z*kb i iwhen 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. The grbwwi sc:i,l./ ; j pgev.6qt1paph in Fig. 6-1 shows the force versus the object's position. Find the w ;. q,wl:pj6wsv/pgte1 ic.ibork 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 obj61jwe 2fm7vuf3/ykbx b. +ojn a)oih*ect in the direction of the force. The graph in Fig. 6-1 shows fj/+xjohm.u673va ob)bk2i fy n1w*ethe force versus 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 applied to move a 55-kgzlj . l1vc lt8bg6,w.k cart (initially at rest) across l w8lkg vb l,t.1c6j.za 10 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 is2tlp)a (mdh-8*z wa+j cf+ /ejl nqs(x applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is (qjt(f /jamw8h +l-s)dlz a x*npc2+ethe 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 a l ek(6mq*gb*u; g4e rsspeed of 5.0 m/s. How much work is required to stop the*gr egub ( l;4e*qsk6m mass?

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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 stoq/g.+ gpbv,:s :bo/gtn vbb;l p a car initially moving at 25 m/s, what distance is require:lvo b/;:,/b qbt +vn.ggbsp gd to stop a car moving at 50 m/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-g dart. It ivpc fjtm36r.08hqh g8s cocked by exerting a force of 20 N over a distance of 5.0 cm. Wig3 v h0 8hf8mqc.tj6rpth 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 com 0*sb ktnz.fcyz)3oi9ponent of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart startkz093 st.izc )y*bnofs 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 b4+tiy)y(tq.8,o sbplo 0di vthd ;5zhay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stop 0,dq(;d+t byz)t5sp.oih b t4lyvoi8ping. 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 7.00 m ab7s xkil+,h9zx/ *dgrq ove a floor to a height of 13.0 m abkr9 ,sxx*h 7dgzi/ lq+ove the floor. What is the change 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. The plane is 4.0 m long anvube( hutkuc1,gx x*r 4;wz,3 d rises 2.0 m. If the plau tberu,k4c3 z w1hgv*xx ,(u;ne is frictionless, 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 spring to stretch 2.r ra6k6iyka; -/3w ues0 cm. What is the spring ia36wyrk /ur6 - kea;sconstant?

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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 sb 5p)bxt* se;ypring constant of 60 N/m. How much potential energy doet)b p *x;5sbeys it store, when stretched 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 cozv v7b xdyq.98-q to,hmpress an initially uncompressed spring with a spring constant of 25 N/m b td-8vq 97ozxqhv,yb. y 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/m fb3m4 wo gk6u t/bt-zg2rom x = 0.20 m to 0.25 m? (Assume the unsw-k ggottu2bb36m4z /tretched position 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 compresh-ddlx 3ta0zef/dcj;m4/o*n sed by 3.0 cm. How much work is required to compres0fd nh/4co*za/dmt;ldje 3 -xs the spring an additional 4.0 cm?

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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 highbp1nsn3/8sowk:lc(xul za t8* + 5s mg slope. What is the speed of t3slkxcz a1 *upn l 5wnt8 /mgb(+so8s:he slier on reaching 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 iq5v8vl;*ct u pu fxyur9ild h 1 a(i,5efn*8+wnitial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m in elevtn 8a*iui v*dl; f59uqp8c(xrl 1, h+5fyuwve 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 frictiarz16lbk /enss / ,rbc)tv(x2onless inclined plane. At the bottom, it has a speed of 9.80 m/s. Whata2zs / tr1v6nxe(/)csbbk l,r is the vertical height of the plane?

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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 to the floor. When it is 0.70 m above the floor, its potd(/i nqz3stq0q48ep v+e6p ejential energy exactly equals its kinp3td0e4 +qqiq pzvse(jne8/ 6 etic energy. How 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, weighing 10 N, blasts straight upw rr-cb,1eis*4u ) 1zvvhtyc(s76fcz 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 weufv) z,r-z7cyvr4c bc(16t1hss i *does it rise?

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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 ground with a kinetic energy of 22ecn )9vm-gl (u0 J. At the highest point in its trajectory, its kinetic energyg) muc(nel9 -v 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 r6 ai:es.r2kz+nlbo b38 z0lexest at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of 28o +a bs l6biren .zl:k3xz0ethe 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 5p4ach(jof;jv7 r3fgfj9 -b7f .0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, w jrfgf79c hj v bf3o(p-;j7f4ahat 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?


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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 botu/qtlj57 .ak ptom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect frila j 5q/pu7.tkction, 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?


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78#
 
  What is the minimum speed of the ball at the bottom of its swing n-qlgx;5.j/vuq c5 at(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 pendulum of length 50 cm is pulled 30 cm away from the vertical bfu b rvg/22-00gn ubhaxis and released from rest. What will be its speed afb 00- g2/bvru gn2bhut 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 moving at 25 m/s hits an ini )k*q)dp ct wup9px(5xtially uncompressed horizontal spring with spr* w(x pdt)cq5xp)9p uking constant 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:lf xp0zm*gt)r a red light. What work is done by the friction force against the wheels?f mg)* lt0pzx:

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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 600q0yel7haq3y u68pmnn3it u1 .0-kg object and a horizontal surface is 50.0 N. If the in1633u li7 8nya0yq tpneh0qmuitial speed of the object is 25.0 m/s, what distance will it slide before coming to a stop?

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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. It has 24 J of kinetic enhy2a1y* 0nne +4 xenpsergy. T4nye*y nps+a ehxn 021he friction force on it is a constant 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 horizontaa49. rg 3vjrtklly to a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surfacek9g 3jtar.4vr is 0.20. If the mass is moved 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 high slope. If the work7bpo; y, jii 24 bp 2s lpambwf*6lp*.gtxtx;5 done by fricti4gx tp2tlx6pws.7pp 5bjy; mba o2b* ; fi*,ilon 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. y l euusm;:9 5z(+rkbh The plane is 4.0 m long 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 tslr kb5uzyh:e9; u+(mhe average friction force 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 the top of a plane inclined aumw5ro+6b96faup pd - t 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will bo+pub5m r9p6-w dufa6e the speed of the mass 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 dropped from a height of 10.0 m, and strikes the ground w 9hv7qtu84fwn ith a velocity of 7.00 mtn749uvqh fw8 /s. What 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 ene)bv-5kvd- ejs rgy when he runs up a flight of stairs 10.0-m j-v5)seb k-dv high, 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 constant velocity of7lei16mpoard yr4)q ( 5.0 m/s. What power must be delivered to the (eqir ldyp6 )41aomr 7object 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 used by a 1.0 hp motor that runs for 3o bnwy8pbj j61kx2ai ,j9y1n1.0 hr? (1 hp y,1pwnj 9oy nbakjjb2163x8i= 746 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 ratbi * e 5nm,iy)u)yzhko 0hs7q8e of 500 W while riding. How much force does her fo )0hsuon*yhy 7i5zm8eqbi,)kot push with when she is traveling at 8.0 m/s?

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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 to 25 m/*y - ijl2zu350 pnzzoh5 ej7c5xiazz8s in 7.0 s. What is the average power delivered by the eno-*zhjyezin 0 5zc 573 8za2xpijzlu5 gine? (1 hp = 746 W)

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