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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 SI q 9xp6sy0 f;s lb:t,nczce.c*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 n x0+xw *xnk(hma vqo- ag(u(q,o 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/+ k dil( gvn(;t5ytcb against a stationary brick wall, the amount of work you/v(d(yb tcl;5g+k t in 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 8)y5fmr1a1emdz+ jk xis being held there. How much work is being done in holding the 8ak1m1e+) yfdj zm x5rbox 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 horizo6: 6cpxe8uoexntally forward at a constant velocity carrying a 10-N object, thecx p:8 6ueoe6x 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 sy2rss o kg05vx/.q5v)fp.oh is lifted vertically 3.0 m then returned to its original poqh.5 0.x g/ry s52 sosvfvk)position. 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 force actiqbxy;t *.hmy 0e(5 itpng 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 sicq kl) mfpgaib6(7g- :gn of the work done by gravity while the ball goes up with the sign of the work done by kgfp m:c)7bl-iqa6 g( 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) grauz,wm3k qm8/ qph, representsw /3,k8qumqzm

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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 rey dv 3d )f-ib xc30mnb+2mwak7presents the work done by the force F?b 7 3ma3-kv0 ywncdi2b+x)dmf

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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 kin rjlq);: r+nuretic 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 th9sxlbx 4 ubk8d2 3id(me 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 object is zero, then the object's kineticyabfqmxb 3*+ ) 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 moving at twice the speed ofvpr7 +c5*l1 xa w3nkps the car. Which statement is truw7cpra*vp x 3+nl5s 1ke 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 car J has half the mass o)2jdxd :pcpz ,rs(.ssf car K. The kinetic energy of car J, compareds (.) rdxzcs:s,2 jppd 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 andnx21 l5 nzmmki/4qvu+ p.5 qof bounces back with half of its original speed. What is the ratio of the final kinetic energy to the initial kinetic energm2nqnzolipq1/45x+.5f k vmu y?

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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-0y q n:;mqrb ,jig7to a speed of 3 m/s and a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what ig ,0q7 q:-my;tnrboij s 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 s -(2g- lmjtv lpjjzd29peed 2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking fojpmgl 2-v j(dlj2zt-9rce, 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 of your car in a pa:pb1qg5g/u; gm-o7bn 9 ncutn7 xrb9snic, and skid a certain distance on a strai1nb-r;nb:sxb9 / m7ngt5c7uog 9g uqpght, level road. If you had been traveling twice as fast, what 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*i8n j aqali4d*hnr)8(s hha/ the Sun in an elliptical orbit. Neglecting any friction effects, whati rahlh j4(*/8h8 *s) qidnnaa happens to the planet'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 principle.i 3.agfd;7d;gicb)v1ef es*i/z /t ab
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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 potential energy?z34+d xkt t8vd

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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 s f2o86 4-m.-ocac y 0fgvmftepecond object with four times the mass of the first if released from the same height.6e8.fpvamc t gf4o- yom0- c2f 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 attack mbn 7u3i3h-t0q)f.bw ihj.thed to the end of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potentifh0 i7jitb33h. uqt .)-mbnwk al 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 mechanicalr.q(pi9 3z izz energy 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 tgu2e0 :zei q-zree. Compare its kinetic energy K, to its potential energy g z2-qzie0ue: 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 a car driving up a8n h6k1y jrz1 e.jof1f 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 heavy owilbzi+;s hla8e u6 3 )mxre0tc/:j p.bject are sliding with equal speeds along a level frictionless surfac hx:j/sabm plz0ew;lci ti )6u3+.e8r e. 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 dc(;sos7 q1y6 auxk 99y svcr9$m_{1}$ 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 conservation of mechanical energy for conservacr 55 jj3 imqm.* a4+le:ridkltive forcesd4ijl5.la rmr* cim5+ jq:ke3 .
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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 zv*(szn9r-3 p a4bstr building, through the air (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 tap *zbrv ss3-zrt4 9n(he 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 di+,us t:8ssocgo0l n;a stance and gains 30 J of kinetic energy. Do not ignore air resistance. Howg0:su;oca so +nsl8t, 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 gravitational potential energy. 7**o tp//u4jnvysug y Do not ignore air resistance. How much kinetic energy did the ball gainu/ o*y*nsgp4 ut7y jv/?

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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 energyi.vt zo;f+lbq: a*h1 c g3oua).
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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 isv;r*;h r-+ req(qe muu

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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 e7,jb kpjd,4hlknd5 y*xpressed 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 t3xjnl64f - nupower?

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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 i/o28ldot -6w5knl6stgp q)k n n one-third the time. To do so, your power outputl on/nqdw ls5 kk 6op2t8t6-)g 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 engine mu+ trpgnx,*vj: st

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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 weighs 90c gratg3x lw48xb83pho47di8 c /ty e: N, how much work was done in lifting itre /h ctt4bdcl3o8ax8g 8:34gw7iy p x?

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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 air a distance of 1.0 m,h q,i,6p3kd op at a constant velocity of 0.50 m/s. What is the work done by the weightq,ph io63k,pd 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 of 550g2gebuvj w4.z+ (i 4nwzton +4/ yyb1r0 N for a distance of 50.0 m. What is the work done by the 55gyi w1nroe 2 z/vwunj4z 4+.+(4bybtg00 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 constay,hl:kt) wf)ga7t(x knt force of 5500 N for a distance 7yx) w (tkhk a:,g)lftof 50.0 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 upward with a constant force of 5500 N for a dist5xjxt0*wvy) a wk+,luck2a 8ck6c1gzance of 50.0 m. What is the net work dw0k xc28)vx6 w kcg1juaak*,l5c+t zyone 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 a y)yp)d (2ow46l+z4 w rkftgfs $37^{\circ}$ 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 a ramp1s a0) 15t tsgv)g /uh;q6h9ja azvadi, 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 (assumv m *slp(:i7-evew6 vte no friction), with a force-*v7pl6i :e t vsemwv( 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. The graph in Figka 8 )*jw7susn xfm-z9. 6-1 shows the fs8mnu xfj*a- 9ks 7wz)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 the force. The graph inu r)u/e ad/60gp 6a*n-/2iv ytuhzypa Fig. 6-1 shows the force versus the object'sa06 ty r6u eihag-udpy*/p2)/a nuz/v 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 objectxoc (*r2:h n-e:y foor in the direction of the force. The graph in Fig. 6-1 shows the force versu2oohr : ro*-e yfx:(ncs 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 forceh dnwk3x+ks 9:. The graph in Fig. 6-1 shows the force versus the object's positi +khknx:9sw 3don. 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-kg cart (initially at rest) cf n ;m;ny2lo4lv,pn2across a nyollp,;2n4f;m c nv2 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 is applied to move a 55-kg cart (initially at resbb pqn,03qap.t) acros .qab0pbq,pn 3s 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 work is required to st a7mk uz:v2-spop t:v7 pkumazs2- he 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 stop a car initially moving at 2o)j w;f0mbfset,ty72 y0whd/5 m/s, what distance is required to stop bhwdy,e0 m ;sjt7 /)f2 tyw0foa 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 is cocked by exert3-y+yau pir:uing a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has up3ruayy+ :i-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 vertica8r apj ;ny+xb;l component of 60 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 hor;a 8yxpbj+nr;izontally 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, striking tq2 )jvnlya,yd:(rx 8yhe hay with a velocity of 60 m/s. It penetj:rqx(yay )ly2v,8dn rates a 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 7.00 m above a kf,i8 9ff;x ocfloor to a height of 13.0 m above the floo f;i 9fx8oc,fkr. 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 7rbujhy6nx60wjw f3) 4.0 m long and rises 2.0 m. If the plan3 j)w6670fxjnu yhb rwe 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 oo 0+sn6+ :,vvihccves bgf,u+nto a spring, causes the spring to stretch 2.0 cm. What is the spring constant?cg sh ,uc 6bnvi ,:++vfov0+se

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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 cok4rdq(+p l(g jnstant of 60 N/m. How much potential energy does it store, when stre k q(rgjd4p+l(tched 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 uncompre7i;(hnieo; 6xtjsvk *ssed spring with a spring constant of 25 N/k;o6;j vith(7n si e*xm 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/m fkp2 l i8t1vw,x0) q fq:raaeg9rom x = 0.20 m to 0.25 m? (Assume the unstretched positiof wqlp,01it e2 8ra9xk:qa)vgn 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 3.0uk+yxam i 8 sa9i tm3i1::xp8m cm. How much work is required to compress the spring an additioxmy8t 3 : mi+8muk aas19pix:inal 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 high slope. What is the sd l0xpy) c pe:v-h osu14rei48peed of the slier on reachid 4)p0xc8ivyh: 4 eol-ru1 sepng 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 qz2lgxhn8s ; mz(qx5-a hill with an initial speed of 4.0 m/s. Negz 2g8zm(x ; xsn-l5qhqlecting friction, how fast will she be moving after dropping 10 m in elevation?

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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.(v5ec.yyu;v f c;(adu At the bottom, it has a speed of 9.80 m/s. What is the vertical height of( ye;d ucvuc.vy(fa5; 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 thz. 58xrozc(pov 8cz6 o the floor. When it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How fast is oo58vc8cz h6z p r.xz(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, blastsw* (f,;.6 ny wvttkddq straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, itvdd6w.n ,w;k y* (fqtts 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 th hgd t;ij1 d3lxo3+wy-e ground with a kinetic energy of 220 J. At the highest point in its i 3x dhoj;d-t+l3y1wg 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 restu *qmrc2:1e ql 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 32u 1q*:mleqr c0 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/w ,: fm9yo2gp5n;qv jds 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 o:5nfy2wm qgp9 ,j;vdof 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 dip with a speed o 68 hj d tkiyzc/g,.qk5. b07lkwj:bkxf 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next sd6t0x:ybg7 hjkc8q5/z jk wk,lb .k.ilope, which is 45 m above the bottom of the dip?


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78#
 
  What is the minimum speed of the bawugy: 6s6j z-mc i4o,all 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 pendulum of length 50 cm is pulled 30 cm away frop0zm 7cgpb twzr4 .)o w-6bt9zm the vertical axis and released from rest. What will be its speed at the bottom of its swz)zbwtg4-6. z 0o7wt 9mp crbping?

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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.dmnf 91 ,5k2re4 tisr-prc fnre w*h0 initially uncompressed horizontal spring with s-nrfe,mt pehr1wn . kr0i59r2f 4ds*cpring 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 kv*q f -z:n3l.;.dri 2uyraq8+kmiefstop for a red light. What work is done by the friction force agai32 y;znm.i+r *idlafq k vu:qr-k8e.fnst 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 horizox6o9d /plfr;r ntal surface is 50.0 N. If the;x/frdpor l69 initial 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 mov s)t1 w.xj0 rq69ec;bkt5d2xt1dk txwosz+9ging on a rough, level surface. It has 24 J of kinetic energy. Theqt9k2 o tx dx5+9t cewzr1tbxksd1;w).jg6 s0 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 ho iw b)ri,cbis0ngxp2 ob-i )qek; bf.+g2y3;jrizontally to a 2.0-kg mass on a level surface. 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 g 0 3pk ibwrboi-);,.bejnfg yii; +s2)qc2bx 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 thef.2e c+ u whioh,ng +o++6qb76ugxgkk top of a 50-m high slope. If the work done by fricuuhqioc+6 k7 2 ex+gf,n.+k +6bhwggotion 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 a*x duo7 xi s2svi x e2ew87ti.9w.l,zyn inclined plane. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the bo2sows 7e 8yix9 ,uxdv. eiz2.x7li*t wx to the top of the plane. What was the magnitude of the 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 t)bkt4 siz ce :qf2r:w;op of a plane inclined at 20e above horizontal. The coef qw);::2fbts zk4cr eificient of kinetic friction between the mass and the plane is 0.20. What will be 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 grkjyu.-. xdhi6 qm53ytf4 kvq.ound with a velocity of 7.00 m/s. What average force o4 .5kd v.kf6 mqi j3hu.txy-qyf 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 us8c/+96mm qmohg xnd kxa.t b0(ing energy when he runs up a flight of stairs 10.0-m h/do9 (haxq6t .g8 c+nbkmx0m migh, 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 constantiwibcj/1 tgpj 8 q11*t velocity of 5.0 m/s. What power must be delivere8 qjgtb/c11jip i*wt1d 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 a 1.0 hp motor that runbr/8u qe0a :kes for 1.0 hr? (1 hp = 746q8k :areeb0/u 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 t ;*wjm/u7rfz rb / 6j+qfk,fcjhe rate of 500 W while riding. How much force does her foot push with when/u;kwz,6mjbrjr*jqc+f7/ f f 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/s ik4j t;nb we0:en 7.0 s. What is the average power delivered by the enb4ne w0j:e;kt gine? (1 hp = 746 W)

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