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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 wi2r,y )17x 6edwnl 9k9uy ndarork expressed in 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 if there is no moaiumo)il0 c pd* 13z1ltion?

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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 r-/k1:xisr qvwall, the amount of work you do rk1-qr xis:v/

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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 (daa+ q uoqs 7p++2sxxvertically and is being held there. How much work is being done i+(dx+xq7u ao + sq2apsn 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 f-/r, li2n /ozuumnjmkqt 4x()orward at a constant velocity carrying a 10-N object, the amount of work you do iom/i xz /um4,rj)u -nl 2tnk(qs

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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 mfxy k(/;s;o pj then returned to its original positiy;o/(pfs ; kxjon. 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 acting on an ob h-ly8 i8we i m: n1n/rusq-u9ju8gid-ject 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 gravity uvp5 a- pg4de9while the ball goes up with tp-g p4ae5udv9 he 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 m ci(7rsy*rm;g,ee2,zv qu a(ip- f0mvs. x) graph, representsfg 7,e(ez2rma -* sy (pmu,;mcvir0qi

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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 work done by tfz (65v 2itdnche force 6 5(ztfvc 2indF?

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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 adxy +08)sl;sp scqpbc)0 oa)bn object is positive, then 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 an object is negative, then the object's kineti rlj1mgcneq1q 2m;t/7c 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 kineticr 9ek6au-bu :dhic5k; 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 iftu.o0)m94mg0 lxuno s moving at twice the speed of the car. Which statement is true about the truck's kinetic energyun o0lt09xfmg)ou m.4 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 shysw l3,m qzc;h d mmzn::h/7*p-a+2zat:kzJ has half the mass of car K. The kinetic energy of car J, p ,3q k:mn7*c z;-azlhdha/s zyswmzt+h: 2:mcompared 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 back with half rp/jb gyjho0yj7i 4 dvz//l,40 f:figof its original speed. What is the ratio of the final o jji/7dv/ /:yfi44lpzh0 gfy 0rbg, jkinetic 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 4p4 lzo0zk;ck a pebble is moving at a speed of 5 m/s. If both objects hakpok44z z ;lc0ve 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 moving with speed 2.0 m/s. A 195bgzd rf5 1q9zxcj c4.0-kg mass is moving with speed 4.0 m/s. Both objects enc j9dcx 5zcg94r b1fz5qounter the same constant 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 of your car in a panh5zf)z:s 2pb/eghl fm.8 rxh: ic, and skid a certain distance on a stra8 .fsh:bl/exzr zgfhph5:m2)ight, 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 masxlwg 5+ndc) qrwry)r7ls79(rs orbits the Sun in an elliptical orbit. Neglecting any fri7(dwqn)rl7 r +l5ysc9rr)gx wction effects, what 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 princi/er sah+d3g0 bbu7/yiple.
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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 poteb*h+sxqd; c /9dp )uphntial 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. ms66zx fsma cv-eh9 :-6xd )jb A second object with four times the mass of the firsxc6ds v6zmjbse6 :x 9a--mh)ft 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 jmp8h + 6r 7ximl*2qxsit to stretch 5.0 cm. If anotherjsxh6m+8l 7 x*2qmr ip 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 energy of a syu pz1c4yo4w7 lqzfb5:stem

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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 k;g sz61( g.pdi3qfd2g 7yac lsinetic energy K, to its potential energy U.ap d.7sy2gcgz6s; 1 d(l fq3ig

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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 drivi7dkr, kavw8+dv0,j mqg--h1yck0jwqng 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 heavy object arzx8ord6x 8d: xe sliding with equal speeds along a level fro:r8d8xxx d6z ictionless surface. 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 e09co jmz/k7 ee1km w0$m_{1}$ 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 ene;(tzyeeaewm -trz27 b/ :u/dxrgy for conservative forces.yw 7b :tz-e/eud( ;a/r2ezmx t
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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, thncque;wf( ,6bi.zf6 mrough the air (air friction is present), to the ground below. How does the kinetic energy (K) just beforeb,wm;6 z.q(e nfif 6uc striking the ground compare 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 of kinetic energy. Do 2ipyhf /cdj(3g7)li znot ignore air resistance. How much gravitational potential energy did the ball loslz/ jyf( 3i 7cg)dhpi2e?

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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 los1hs+i j,h 6a:k wvj.ices 30 J of gravitational potential energy. Do not ignore air resistance. How much kine kjcw. avh6 1:i,+hjistic 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 conservationas4xfu f3-bqnt0 c8+z 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 isvdr;7 p6+qli,m zusei,lls /4 nb2m pnx ;j,u2

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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 exprqe,z3. 9xpv vkk; m1lje9ae.iessed 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)s2z+5 u4crrlb 7-hpahenn q 2?

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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 t 2sn /hrzqcfc0b,710guxprl04 wn(pnhe time. To do so,(xznn0pcugrfrnq0 l40b1sh w, 27p/ c your power 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 const:0o* ff r+kjh dp4xxm9ant 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. Ifb d9vm+4 lkm67wny f+1x k*nul the object weighs 90 N, how much wor*k+ 47+du lm1nbw9x n6y mvfklk 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 air a distance of 1.0 m, at,864lrk vlx/tdr)d vg a constant velocity ox ,vrtl/) dr4 86vkldgf 0.50 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 k.glmfh 0s(f6(gd-ftupward with a constant force of 5500 N for a distance of 50.0 m. What isgf6kmfh (0lfs. - (tgd 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 pulled upward with a constant force of 5500 N for a distanc00;z kfrvltj r;na yy4bs *.-xu, 0xkwe of 50.0 m. What is the work done by the weighl;z 4vws00kx; fy0yktr*axr bjn-u,.t 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 5500w q5 +keyht-i; N for a distance of 50.0 m+5wqhyetik -;. 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:k9oh;vpv8 j z9a lm3a.0 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 8.0 m down a ramp, inclined4+7j 1qroj7dak19a0x) mmsbb+u nwqo 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 ligxdt l -.q0h0c)j zxj0ttle sister Sarah in a sled on an icy surface (assume no frictiot0.z)0hg dx -xq0jcljn), with 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 in the directiona6-qbilrr e(ua7y ,d 6,mwmu*a ql -7gq1vlu9 of the force. The graph in Fig. 6-1 shows the forceu7-6r,a r76 9e wavl-a mq *lqbmlg,dq1uyui ( 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 ofc va)4m6fuj3dk:g.q4 dkvnl7 the force. The graph in Fig. 6-1 shows the force versus kk. lcmu7jv)dvngda44:f63 q the 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 *,xb lip7s)t59 osyqa force. The graph in Fig. 6-1 shows the force versus the objts)x qosal9,7*b5yi pect'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 direct0+f91lgl4 bgh s7f u.o7ywtyxion of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work dfls7 x4b.gy oy+w tl7g1u9fh0one 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 .-xo q. s,q.dkgki )7nwuy1xscart (initially at rest) acrosq,doswkx1.xs7gi. n .q )-k uys a 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)+uhnn0klr9ur ;ha N is applied to move a 55-kg cart (initially at rest) across a 10 n+; hr 0u9kulr)annh+ 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 ga ;aqajj2)c:x u- kc/ub8 ap,csk 7f0required to stop 80/:);p-c cqfck aju 2 xska,a7 uajgbthe 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 25 m/s, wi8oab80/rmgm;wl , g hhat distance is required to stop a car org h ;/mglwma8bi80 ,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 aga )k5bv5 f-,qck+yn t 10-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming th,kvqcafb) y -5tnk5+ge 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 j5iqydr8t k:h7 co-9l a vertical 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 horizontajlqk5t coy hi7:d9 r-8lly 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 y.pskpao 8 f- oe4cm dak 2vq8t+cc1x4.*,uwta bale of hay, striking the hay with a velocity of 60 m/su+8. 4-t *1xccyoma t2e .os fdpq,k ackwvp48. It penetrates 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 floor to a heigh0rv,0giaez( . izm-axt of 13.0 m above the floor. What is the change in gravitational -0zi,e(rz vax0m ia.gpotential 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 an1*8 jbhmd p y9*v2fgprd rises 2.0 m. If the plane is frictionless, ho*gvb1r9fj8m2dh*p p yw 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 stir)b// y5s+pvszp men k1 d-r7retch 2.0 cm. What is thien zss vmpdb7y)-r/ rp1k/5 +e 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 *m8h f.iu wu*pspring constant of 60 N/m. How much potential energy does it store, wwi*u.fu hp8*mhen 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 initially uncomprem.f5 g.poj.gwf50 l*1yb zpfvssed spring with a spring constant of 25 N/m by 10 cmfpvj 5f..bo*wm0g . 5 zy1lpfg.

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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 sh(htn9 ezj1 *x 8io:nfrom x = 0.20 m to 0.25 m? (Assume the unstretched position is n1iszto :h9*x (ne8h jat 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 initif+tlp1ioi0el: 2q0 pgally compressed by 3.0 cm. How much work is required to comprelip 0gqeit1 0:o+2p flss 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 5-uiel +xq9:ps.s vf4ax8ju q70-m high slope. What is the speed of the slier on reaching the bottom of the slopeeu.x8 4sxq u7q9j+ sia lv:f-p? (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 spr(gk0lr4h jn jl6*i ;geed of 4.0 m/s. Neglecting friction, how fking; *j (r04lljgh6rast 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 frictid0kss/bu)l:5 r i njkzx;eg ,)onless inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height of the 5gzlj xi:,n su k) /0kb;rdse)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 tm*0j53.wiv pcbh0ogb vy 06rjhe floor, its potential energy exactly equao 00 yrbjbv wc*3jvp 60h5g.mils its kinetic 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, blasmypd/0b/xb 0k,dq vpwre;u5 8ts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechan/8 mq5 0er bwdpp0/ukdv,;xbyical 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;4wn.z c9cwu,ti6xys the ground with a kinetic energy of 220 J. At the highest pointw4icy st9,u; cnz. xw6 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 fromwjd ef0eke6 avg3db3 kzt6)- + rest at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will w)ab-vf30 d66jekdek g z3t+e 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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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts with a speed of 5.0 m/s at a point 45 m above the bottsh5:t4lyqo 2bom 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 above the bo5 qb:t2h4y solttom 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 +eayfx-0;4o ltn t(shiy v;y7 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaste(a4ony-xysy0+7 hett i;;lf vr 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 bfqf(azy:h- * sz3ngg 1all 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 from the vertical axis a e,-/z bb2zwcand released cb/wza2 ,e-zb 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 moving at 25 m/s hit8ooob5y9 xlh6lw kc- *s an initially uncompressed horizontal spring with spl y65*9ob-8wo lkxho cring 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 lw0v 8 m7btkz,her 2000 kg car to stop for a red light. What work is done by the friction force against the wheel k,7z0mlwbtv 8s?

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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 horizontgr 6i aqnge3x2gi j:33al surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will itg33j2 aqr:gngi x3ei6 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, leveeec+s(5gnjyh :.yvbd x - j*j(l surface. It has 24 J of kinetic energy. The frict.y((jbshd -jgv:e+y n j x*ec5ion 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 horizontally to a c,wzna d2 ;x0z2.0-kg mass on a level surface. The, zza ;2dxwnc0 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 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 f )wq3*ien +d5oa iqt0t.zbr( yrom rest from the top of a 50-m high slope. If the work done by friction ii5q n*3 )ye ia+q.bwzdt(r0t os $-6.0 \times 10^{3} \; J$, 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 plane4na o;cg((j cg. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the;ga(cn 4( jcgo box 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 top of a plane inclined at 20e a4zwxnxha+m+,a(+ m:.)k su1qvsi ugpbove horizontal. The coefficient of kinetic fricnihp4uw sv )gz s ax++xqu,1:m(+mka.tion 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 10i nah*azkzz06d07-kk4(w p8p u iqg5 v.0 m, and strikes the ground with a velocity of 7.k izgph8-4za0 u6v0 and5 qkk*p(izw700 m/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 energy when he runs up a ;+c(ro8fs wi aflight of stairs 10.0-m high, +fir( cosaw8; 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 mn,d7a*d-uyd k ove an object with a constant velocity of 5.0 m/s. What power must-*7ak,dnyd du 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 used by a 1.0 hp motow/;o *l9+ n ;6vlwh.e ktravbgr that runs for 1.0 hr? (1 hp =*gl.wlb rw6kve9o a;tv+h /n; 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 rate of 500 W while riding. How much forcewh95z b k vi8k*py4pq0 does her fokkwv8h*z 95i py qp4b0ot 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/s in 7.0 s. What is tzhl 75k:23rdj uvf1v340ubsj 9tht:tqa sy.vhe average power delivered by the engine? (1 hp = bdu439sht2 :7k: stfjtvl5 rvyv zq0.au h1j3 746 W)

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