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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 ih0lrn6tnn v0. ctkkm;w t x2.)n 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 system +ame5xn)p/ j vif 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 against a stationary br/nh,9kp fxs4l ;l)ai b1w zpj3ick wall, the amount of work you ka1pxzjsf,lw3n)bi;/ p 9 4hldo

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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 v24sq05pp /f*xg qpjkmertically and is being held there. How much work is being done in holding the box in this positioqpxjqp 4*5 s0fkp2/ gmn?

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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 forward at a constant v*s:q/-wc0 wk weug4 i0xxp7sxelocity carrying a 10-N object, t4w0 wgw0xi*xx7suk -qe/:cs phe 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 vertically 3.0 m th)a ot3xn- acy +-wc uuugtkd7,k h9d(8en returned to its original position. If the total weight is 3g(-ukt),yacn7-k+dou at3 wh8dc 9u x0 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 forcep ,d1ioblez ,.qze1b 8ke(,yi 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 graqbfo+j 4 rfo1kx0ty )3vity while the ball goes up with the sign o)0bo1f4f3 +oyt qr kjxf 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, repri tjcv* tri8f sa,9k(xz6x xh::v1,xdesents xtx(i: c,h ksr8,xvz*a1tdiv6xfj9:

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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 ve9qoeu +voxbts0(i6i7 rsus position (F vs. x), what represents the work done by the force Fov(q9e7ut6xi0 bs+ io?

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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, tozm 63(jpa4 iphen the object's kinetic 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 vqh3m1aq/9m,fp4 lf nan object is negative, then the object'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 objwyb za:nikz -dr;fcv k z2w.5;p e:j+3ect is zero, 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 as much as a car, and is mo(j6 ygixiw q4q;8c bku73sz vsby*f./ ving at twice the speed of the car. Which statement is truez 7;6qy4bvij us3 wi/(sg k8 cy.*qfxb 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 cg c oa0k)3zye c c009h71niczlar K, and car J has half the mass of car K. The kinetic energy of car Jzkch7el ci1y9n)3 0 z ac00gco, 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 bounces bac.pyldn nerq96;hmr;2e5 co9 r k with half of its original speed. What is the ratio of the fi29p ;e 5 ;lrh.oy6nqmrde9n rcnal kinetic 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 imd shn5(t +in,m 3xn+js moving at a speed of 5 m/s. If bothm,5+x3njm t in(n+hds objects have the same kinetic 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 movo9lh1( 6;vgqoc sy) xning with speed 2.0 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 object travels the greater distance before stoppin( 6soh;o1v ) cnglxy9qg?

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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 h*trk rh;76rrojhk 0 (car in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car h hrrrtkj k7( *60rh;ohave 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 the Sun in an 3. n3m -kz sw7duqaq4-g bh j/+cg7stielliptical orbit. Neglecting any friction effects, what happens to the planeqnia7jsg tcg q3usbz 3m7 .4wkd+-/-ht's kinetic 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 principluk1i s48su0pce.
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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 potentijo ,hlsq j,kvc9nna74doc+, , al 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 rest a height h above the ground. A second object wi1z;llx r.4j ypdw q:t,th four times the mass of the first if released from the same heylpd z:4x1wlqrtj.; ,ight. 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 s4s90ecjyvnp yg58ls 4 445okprdrd +fpring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of the sp4v0yk 44p9c5ers4gfjnd8d o+ 5lsr ypring 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 energy jc j11nvy/u+x 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, to its po*i b3p3xq .d9-p1bhkwgqekd 0tential energy Uq. k9gxdw* p-1ib3dk eqphb 30.

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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 )gmv; y2 ay nf7wb0f3ba 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 *dr02w3)ngy3z-ombvi 4hryyvery heavy object are sliding with equal speeds along a level frictionless surdg3-yhwyn3mo rv2b)iy z40 *r face. They 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 ,+-ynlxxh j7h erq8x:$m_{1}$ 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 conserfwy 9qjr z9(s.vation of mechanical energy for conservative forces.y9w9 z jrfs.(q
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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 tho zsgkgj ; wx0g t73+)*9ejf xv-wo4hte top of a building, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compar4*g +wg0z9fx xstv)-g7kj3 h;e oo tjwe to 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 of46ip10wy sa(1ef jxuu kinetic energy. Do not ignore air resistance. How much gravitational potentia1js6upye xwui0f1 a(4l 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 1b .hl84wocmkloses 30 J of gravitational potential energy. Do not ignore air rebmkw84lco h. 1sistance. 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 energys 2.vzam i.t2 kit-jhi0g j2-t.
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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 isgm.k ;837 )( bxtkxugy rco;nb

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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 in SI unitsn+7tbx 3nfsx) ?

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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 no7gv fdq: 5fs+a bg*u.4u-ndnr t a 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 timeqmp( m :z :lvxfr/7t.m-aobo87ntr l*. To do so, your pomqp7.lb*(::- 7 n t/8f zrmotvmolraxwer 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, xhg7a z8t yvs m*c0 ,qpjr(d79the 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. If the object t qv1s4mh vk33q5 j*ztweighs 90 N, how mucht4*vz3 1kmt3s5 vj qhq 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 aiwq(oe2z ,hs dg:)5miazi; 2fm r a distance of 1.0 m, at a constant velocity of g5,m( hzdzi2q o2mesa: iw );f0.50 m/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 pulled upward with a constant force l n9uumj, h3 z7z0i)uyof 5500 N for a distance of 50.0 m. What is the work done by the 5500 N forcjunz) 0umzl 3,iyh7u9 e?

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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 upu( xeud,;j m;4 lw7jvzward with a constant force of 5500 N for a distance of 50.0 m. What is the work done ,; ;j4mejd(z7vulxwuby 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 , + aq7,s :w4wz 34;(mylksitmfzhsfm of 5500 N for a distance of 50.0 m. What is the net work,wz; mfifszsahy(mwk4 t7lq, 4m 3s+: 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 tb2 9**tlhgqtk,unw w*j j+y3up 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 8.0 vme9+7 eb5o unm 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 fg ar.pyq:. 3 fcudp 9)f0uubo)riction), with a foa) p3. dguf y0c) :u.ubqr9opfrce 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 in the direction of the force. Tpnk.2i nvrov*4- ct7a h8c2bp he graph in Fig. 6-1 shows th voa2c ncn82ih.vp*7 kbt4r-pe force 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 the force. The graph in Foaw:uvg/u vf:4 q ** ttlx0q)zig. 6-1 shows the force versus theo*t : uv/a0u*f)wl:gxqt4 q vz 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,9yqcu(v/-/h rpiv xk the direction of the force. The graph in Fig. 6-1 shows,ph ck9/(-q/vr vyxiu 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 force. 6 y90/h-miu*lkz:ye9rwsmff The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when6wryz m l 9 *i-9f0fek:/hsyum 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-vi:zo b 3zq c.c5uawydv kom0zq yj9/:3l-v- N is applied to move a 55-kg cart (initially at rest) across a 1/b-90c qyjouz ick-v3w 3lm :dyq. -5avv:zzo0 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 applied to move a 55-kg cart (initially at d3wfdyys *y7fa.fe; qka t2 0.rest) 2a3fkyedd s0;affw7.q *ty. yacross a 10 m level 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 a speed of 5.0 m/s. How much worxj.h yjw 0av: ( c*:z*i lm,jhng(l;eyk is required to stop the mass :hmiyjx ,ea(gv;jhlz*j w0cyn *(. l:?

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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 initially bi-mum9uu3 m-.sfl u5 moving at 25 m/s, what distance is required to stop au3 m5u9.usl- ibmf-um 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. knfz4*( cqj7h It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speedzf n(k q4*7hjc 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 of 658.temq*g,hc (r fjtd0 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally alohregj(mt* .t5,d qf 8cng 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 xos*fsqf 07r1 horizontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopp0 x71 qorfss*fing 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 above a floo2g ub pxp/),opr to a height of 13.0 m above the floor. What is the change ,) 2popx g/bupin 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 anwyvn 4 l(p3sw3 e/b3px inclined 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 pushy3/xvw pb 4pewl3(s3 n?

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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 stre0,4 rr6jch mhrtch 2.0 cm. What is the r c46 ,mhhrj0rspring 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 spring constant of 60 N/m. How m02y,o slhhv 6;sd 5ayl5pvdx(uch potential energy doe(ls s02h6hvd;yov xy5 dpl5 ,as 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 compress an init ys j orsx309shts.4z+e.iy 1hially uncompressed spring with a spring constant of 25 N/m the4+s yyhszj1 0ro3x9. s.siby 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 sprn *z r4vfz5x,xing of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is v* xn5x ,zrzf4at 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 waa:1l 1oay;o initially compressed by 3.0 cm. How much work is required too aoa1:w 1a;yl compress 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 tm9 8 jy6j94moff/ti 8.p0xee plby n5she top of a 50-m high slope. What is the speed of tyffiomjn5l xep0/649 tjymp 88 se .9bhe skier 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 2xj(d z,- reoman initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m in e dxm ,zj-o2er(levation?

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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 hashs2x6, cz5f0 kg ,jgld.gui3aop/hxi x/ f*1m a speed of 9.80 m/s. What is the vertica,pxg 62ldf3hg0*x.h iu si5/z cjx,gak/o1 m fl 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 ml0xb18haqud s b.cs4 aw.7zt/ above the floor, its potential energy exactly equals its kinetic energb47.a0lqsd1hzabx sc . 8/uwty. 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 1j/ qa eqj7. nzixhv:460 N, blasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectorziqv. ejqan7 j6 /:x4hy, its total mechanical energy is 140 J. To what vertical height 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 220 )ql h 3,qd+-r*fyb vt rg7sl9iJ. At the highest *3 r-,v ly7sbqrtgl9+)dh ifq point 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 starm29*ught0j gm ts from rest 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 the next slope, which is 30 m ggmtju29mh* 0 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 point 45 m v+tclmq/ 0pxu q4c,r4above the bottom of a dip (See Fig. 6-2). Neglect frictiont/vp4 +rlc ,cq4xuq0 m, 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?


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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 bottom of a dcblae25s78 ovip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the rol e2obl8a7c5vsler 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 b;i gnau2;u4neg hj 2/wall 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 o(0kqrn m7c*n :r/sgp pulled 0.24 m away from the vertical axis and released from rest. What will be its speed at the07 krsnm(:* g/rpqon c 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 a-3ekhtk y;+ jut 25 m/s hits an initially uncompressed horizontal spring with springh+-t3e; yju kk 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 stop1:luv - :0pv6em/d+owt fftwl for a red light. What work is done by the friction + :ltw1-o0v6vfmd pe/f w :utlforce 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 i1/y zz,y (6,rvcgvqn5vmg8 aas 50.0 N. If the initial speed of the object68va/(v yzmngvz5,q gcra1 y, 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 ener;j3pizj)t/uj 9xu 8m wgy. The friction force on it is a 9tmxjpj;z )83/juiw u 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 horizontally to a 2.0-kg mass on a level surf f tx f02tupwsv82gu+)ace. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its kinetic ensu2pt0gx2fw8v + )f utergy?

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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 jb +,7lj5ppc uhigh slope. If the work done by frictiou,cbpp+7lj j5n 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:9ku .)luj ncs up an inclined plane. 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 the average friction force on thejusl.9c n u:)k 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 91b b0ceno8ziof 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 mass afteriz10 9ec bnb8o 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, andikuobshwk 17 9 .y- 6wh1h:kui strikes the ground with a velocity of 7.00 m/s. What average force of air friction h whky:6.i oh11 kswuk97-biuacts 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 boy28jwpy qc8kd0 using energy when he runs up a flight of stairs 10.0 jpykq02w8cd 8-m 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 oi 4m1kfst-pdm; y..bsm6 rp2velocity of 5.0 m/s. What power must be del-6md 2; mp4.t syi1k sbf.pmroivered 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 used by u.k;.jrkshh rs 8v,lu. ( 7kwea 1.0 hp motor that runs for 1.0 hr? (1 hp = 74khjekussw .h(8k.r7; ,.l v ur6 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 whiliph5*fycfd0 4;r-eepsq3h f *e riding. How much force does her foot push with when sf34hh p5-pf eiq;ce*0dfrsy* he 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/s in 7.0 s. What ipdrvapiu ;u+p6,vq +6 s the average power delivered by the eng6i,+a;ppdu+q6u v rpvine? (1 hp = 746 W)

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