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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 op**8ogaw4 o07wzq t(9mqm1un rarw k9f work 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 sy *uhcyoh6t/:9 a ;aq qe3ftql5stem if there is no motion?

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you push twice as hard against a stationary brick wall,.on6 hdp4i)xd j3 yq*s the amount of work youhdon6p)s.3*yqxj d4i 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 vertiu0 f6e9o dvw4vm(s(nkcally and is being held there. How much work is being done ind om (vkw04nvsu(96e f 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 forwardw0liq8ijw n k;6gsj9+ at a constant velocity carrying a 10-N ob+6qwinj jwigs0 9lk8 ;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 vertically 3.0 m then returned to its ori*ig;0derefc i 1wk d:/3eo)a gginal position. If the total weightw; g i13doce)igk drae*:e0/f 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 object do work on thif /:-yx6q kmonene 38z+q oh/e 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 graviud0 r qjvih*2rp ,s )2 lwlin)k5xn8-rty while the ball goes up with the sign )hlrdk rr,pn5 xwil0v2-n)8 is *j uq2of 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,-5y hhrp5so3s* xpu.b on a Force versus position (F vs. x) graph, represents-rs.uh5 p yb*sp 5x3oh

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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 posituv b:2h:oz9 kow +3kzxion (F vs. x), what represents the work done by the force F9vukzoz3h xk ow:+:2b ?

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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 ; v0dw/zi3bol+qyf2b 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 kinetid5 0hvo4 gs/ryc 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 ze00q:byuqcmad/w t2 9yro, 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 moving at tqk;dj;k p/ hys *)wl0twice the speed of the car. Which statement is true about the truck's kinetic energy compared to that of thl0h);sw k jtqdp*yk;/e 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 czmot5bj;7 ,5umfyc ql 6q0p*har K, and car J has half the mass of car K. The kinetic energy of car J, c* o zcjbm50q6h;l q5yp,t7fmuompared 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 andb,ry h:qjbt28 bounces back with half of its original speed. What is the ratio of the final kinetic energy to the initial kinetic ener ,br28hqt:jb ygy?

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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 pj 415ef n)snpa pebble is moving at a speed of 5 m/s. Ief)54pnj1sn pf both 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 moving with speezub0f8ak:l c2c wdz*bw) w9d +d 2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constanfb w0k buzw9z2c:) dc 8aw*d+lt 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 p lb2o8 gg9n72e vz4cllanic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the same c8ne9glgo llz 2v42b 7conditions?

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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 elliptical orbit. Neglecting any :vj :x; dz 7eo8pi8twktk*xy9d+all1 friction effects, what happens to the planet's +k o:8txlj v17tx*yp;ik e 98dd zlwa: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 principle3y8(z*j;)8fdvd(co1 m j xnog 4iacoh .
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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 xufubfgj 8, (dh /c dygzx2m:+7wfjn r8;l/ 4vpotential 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 wi x: seb3ru.k3lth four times the mass of the first if released from the same height. The potential energy of the second object compared to the first i 3s:u ebl.xkr3s

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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 t rsu.88bmm, vuhe end of a spring causes it to stretch 5.0 cm. If an8um8. m,rvu sbother 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 r8awe lr5) erbl 57dipxkn5* (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 tree. Compare its kinetic energy K, to its potential ener6x r, 2i)b)go*xs kisj,gxkoi))2* s6jxr b isgy 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 a hill. shl;24tw1(c4 aczsw* xpwy5t

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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 are sliding with dq8-( b qy-l2)vkqmbvequal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to a greater h(v)vyq bm2 q-8b ldq-keight?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two masses akfx24+cfdr 4 bxz9w5$m_{1}$ 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 consvtx.4b2gb q3244ne n kd *vnkgervative forces bt4qkvbkd4.xn ve2* 2n43ggn.
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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 touz2c 7zpn q5,7tdhx /sp of a building, through the air (air friction is present), to the ground below. How does the kinetic energy (K) jun hqs7,z2zcud/x57ptst before 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 distan opb.vatxdhgi + 2vl3o*,+*y*q 7iojbce and gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential energy tdiv+ob xq72b,. j vy+io*3ophl*ga*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 gqajn ehd: r5so2h03 .cravitational potential energy. Do not ignore air resistance. How much kineth2 c.r5aen j0osdq :3hic 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 energy. .5si7s kmkl.y
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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 ishe alzcx)3ho0 )yk4 0f

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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 45 wm-pv(kckz5a l-dkunit of power expressed 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, whic 2ut dtwqif9 4b-efvzu(9zt/)1j*sedh is not 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 k4h9f) 7zmkdv the work in one-third the time. To do so, your power output must have bv74 kh)k9zd mfeen

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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-1t*awdap+4;yir; qchcf2sg 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 2.4r 7o(;dmga*tdv(n cf0 m and held there. If the object weighs 90 N, how much work was done in lifti7d(vfrt;o*4 (md cnagng 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 ofum k .6l 6caetju rjzf8;( -6uvlaj7e0 1.0 m, at a constant velocity of 0.50 m/s. What is the work done b6a768(ter c-m 6avjjuzeu .;f ulkl 0jy 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 of 5500 N for a0n:b;p b1n3b :yu /pkx a*i bh7wphfx; distance of 50.0 m. What is the work done by the 5500 k;wupfi;*b 0 p:nahnpb1h 7xx/b: 3byN 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 *fv li:tr+u q7 tqwxl)* k-ap*constant force of 5500 N for a distance of 50.0 m. What is the work done by the weight of the elevaix*+ t*kpa)q7lwquvr ftl*- :tor?

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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 ofgo d9m,nhyb -acd0j; 2 5500 N for a distance odbd;2gyc0o -, a jmh9nf 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 6.0 m up along aos73wpywoy y6c cj;g7ymg 7:98y p em( $37^{\circ}$ 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 dowxov)1ut:ka ;; tdxxzm0um9 f.qr /tw .n 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 sisq rter 1)d(i a8a.i/su+* cyeqter Sarah in a sled on an icy surface (assume no friction), with a force of 60.0 N at an ayar .qq)1+i*(8 s teicrduae/ngle 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 zq- g.(k o,- ,udlflso+ief;k force. The graph in Fig. 6-1 shows the forcel-k d l;u(o efkgqzs+.,-,iof 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 gy 8 ka3kk uualk),94dkqgo1owpcm--6 raph in Fig. 6-1 shows the force versus the object9kw,u q-4yudg8k1 m)akkclo- 3ko pa6's position. Find the work done when the object moves from 2.0 to 4.0 m.


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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the force.t 2r.8mp/y:r:p cujj ovmg55cb0p:j:s6guho The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the o rtc6c82 ru5 b0/uh::g:y:jmmg5p.vpjpsojobject 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 dirfbh, q iiw evz04i/,r8ection of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find thriii0q vhfz4/ ew8,,be 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 res2n6ff+w3 c0/ hvbrmdyt) across a 10 m level surface. What is the final kinetic energy of th2mh/rd0+3nfv y fwcb6 e 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 20x7k7kl.-d pm g0 N is applied to move a 55-kg cart (initially at rest) -7kpmkl .xgd7across 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 requvzc g ;tc4psy9;- irw;ired to stop the mas rpsvz;9;;w4gci-ct ys?

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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 stop2g m:a*g4xbryiif s0/ a car initially moving at 25 m/s, what distance is required to stop a car moving at 50 m/sf yg4rg:si/im x*2 0ba 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 .7v/ gwec9tz oexerting a force of 20 N over a distance of 5.0 cmz7/v 9tg owc.e. With what speed will the dart leave the gun, assuming the spring has negligible mass?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 100-N force has a horizontal component of 80 N and a vertical compony,oid6*)29v aae oppx.v r)cn49w b kzent of 60 N. The force is applied to a box which rests on a level frictionless floor. The ca )ckn ,4aepr.vy*ovp6 x9a)db9ow2i zrt starts from rest, and moves 2.0 m horizontally along the floor. What is the cart's final kinetic energy?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An arrow of mass 20 g is shot horizontally into a bale of haybmts;kk04 r lsnd48 b5, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. Whatbd4 s0 k8 b;mtsn5k4rl 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 movj s zf ju(,p8u*mmbp w62k2-fged from a height of 7.00 m above a floor to a height of 13.0 m above the ,wz fp(k-62u8j jbsm*2gmpuffloor. 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 pls1gmxv )y)a 1kane. The plane is 4.0 m long and rises 2.0 m. If the plane is frictionless,m yskxa1)1)gv 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 spr61+ li3a(bqu.jsns kring to stretch 2.0 cm. What is the spring cons.6 s1rsjaubiqk n3(+ltant?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring is characterize+8 4rrvwjdmuzlo g.;+ mokpd o; ;3zj.d by a spring constant of 60 N/m. How much potential energy does it store, when str8odrgjor+vlk 4w+; u;z3.o ;pdz jm. metched 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 comprkk + ic l*p:-mi.cmfr0ess an initially uncompressed spring with a spring constant of 25 kmicp .c*f -r l+mk:0iN/m by 10 cm.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What work is required to stretch a spring of spring constant 40 N/m fepaqy j89l;21oxpm s i:jts56rom x = 0.20 m to 0.25 m?6l2q 9eysasjo tjmpx5 ;1:ip8 (Assume the unstretched 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 j0* ()bekzap7z1b( lrjjwsi 5 N/m is initially compressed by 3.0 cm. How much work is required to compress the spring an additional 4.w (zbpk*0 ai rjjj(esb 1l5z)70 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 y7v5v5 2kvibw-m high slope. What is the speed ofb257iy v vvwk5 the 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 innp 6tss- dhq:(n0j2fst5c powe1p1+t itial speed of 4.0 m/s. Neglecting friction, howf1t(h+sppde jt-6:cq520sotswn 1n p 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 frictionl0 fikcr2xxhq(2 9c cx)ess inclined plane. At the bottom, it has a speed of 9.80 m/s. Wh x( qcrfcc )0xi2xh29kat 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 tois-axx 3 l49of the floor. When it is 0.70 m above the floor, its potential enero lis3xx 9fa4-gy exactly equals 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, blasts strs-66 l8rhy zqxaight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total 6x-slh z 8rq6ymechanical 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 n05 1x:ra.7 l(8ofgn jhdalkhof 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relato7.janrfh allh(x8k g n5:01dive to its launch point, did it rise?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts from rest at a point 45 m iv8 x4)2;gtrox pmnv4above the bottom of a dip (See Fig. 6-2). Neglect friction, whatxng)8tm4p o;ixrv2 4 v 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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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(o.vv c1jboc 4(ct r) *ys7fpl point 45 m above the bottom of a dip (See Fig. 6-2). Negc vv4 (l)7( pbsytc.c1 rof*jolect friction, 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 dip w( 2-h kxeyfa9jith a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the tok fa-jhye9x( 2p 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 ba (s5ad:k1nw 8iyr6mudll 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 pzju7az -d 5,vm:mgx py w8k2m3al32r+j8vxueulled 30 cm away from the vertical axis and released from rest. What will be its speed at the bottom of v2a7zmw8:lxd-uv,8zraj ym+ ke 3 jgm2 3px 5uits 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 initially uncompressed horizontal spri rdq w.6lzcjfvfqm0j;2tf.2:ng with spring co;: l cvf26jmw.d qjt2 zfr0f.qnstant 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 for a red ligh +a1p2zysza y.le v39d 8ciix(anz9,pt. What work is done by tz2vpa9dln.+,3seaiy ( ipz a9yz 8cx1he friction force 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 betweju.7 8d 0b h3dxfbh5uien a 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, wh3 bif7x8.hj dh0u5bu dat 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 rougu4n; ;f m2rb*+dbtr huh, level surface. It has 24 J of kinetic energy. The friction force on it is +n;hu* 2u 4bd;rftrmb 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 horizontallyzaxpbgz+y /)7 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 di gy/a+ zb)zx7pstance 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 5i pnotk+ db2u) b)*lu 4x25iyr0-m high slope. If the work done by friction i)bu 4)xut b2i*+inlr 5kp2dyos $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An 800-N box is pushed up an inclined plane. The plane is 4.0 m long and rises h)56 zyumr6 8nwgr5oj ve;bt.f*zx2f 2.0 m. It requires 3200 J of work to get the box tougv5e6;zfx t5jr.w6ohb8r *nfm2yz) 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 2cw;i,pq4p3c ab8*f cm0e above horizontal. The coefficient of kinetic fwcb4q cm*,;a f38picp riction 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 strikesvo/ina +xe t;3 the ground with a velocity of 7.00 m/s. What average force of aiv3x;no/ i ae+tr 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-kg0q d9yn ut ;z66zo*xoe boy using energy when he runs up a flight of stairs 10.0-m ;6 z6yq9une0to* xz odhigh, 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 t8dg25 vz bfor.63ggcl /3kney o move an object with a constant velocity of 5.0 m/s. What power must be delivered 3z ge.36gkdnrob y5gcf 8v2l /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 en2f c:6pvi7q;,ej a dvvergy are used by a 1.0 hp motor that runs for 1.0 hr? (1 hpa vj:evp f,72cdqi6; v = 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 50j w wclqknf32b)uqrs yv6onk,3,*+3 p0 W while riding. How much force does her foot push with when she i6 3q cw)3ln uryf ,vknk*pwos2q3j,b+ s 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 frg.3w cimb)hw30s87/gmu xewya u7 ad;om 0 to 25 m/s in 7.0 s. What is the average power delivered by thsw.3/x3 mdgba 7awch8)w g0euim 7y;ue engine? (1 hp = 746 W)

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