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习题练习:Physics Unit6: Work and Energy



 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 expressec4iw 6pwncs; , joxgtzxm24(s103 h+dgyt6 hdd 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 :+j7 fddzao8 2chh)stif 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 stationarf gu6(0ttn *b *0mta0wuuahc:y brick wall, the amount of work you da:(0aut6t*chf u0g* wt mnb0uo

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 50-N object was lifted 2.0 m vertically and is being h-y cjvc,r 4yvn3vs1e 9; ws0u) ybg1qweld there. How much work is being done in holding the byjsns9q 13yu vec gv0c),1 ybw-4v ;wrox 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 forward at a 0,m4ji lqfiv s sov--7constant velocity carrying a 10-N object, the amount of wo qli-7 ssomjfv0-vi 4,rk 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 ex7+ukqm ;s+gm then returned to its original position. I+qge7 + xm;skuf 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 acting6wz+l+x b;wxz 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.au4pqp3f;zk0bchs.mq 19 o gwu* s6m+ Compare the sign of the work done by gravity while the bp* a1qs 49 khsbp c f+;o6m3ugzqm.uw0all goes up with the sign of the work done by gravity while it goes down.

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The area under the curve, on a Force versus position (F vs. x) graph, repres0m4f r mjrm.jajp2 58hentsh80.45rjpmjrma2 jfm

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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 posit ( fsdv03s.8zoq)mo 4 j/j5h)smaqsrh ion (F vs. x), what represents the work done by th 5qhjr 8qa3s/fo 0.shszo4jms ()mv)de force F?

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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 5a-5gqpsa )lx9y fsm9 ebq0*1cjm 0dzis 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 negativ)x( b5gonc +fye, 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 object is zero, then the object's kinetic evobn9+d7i.z+-:gx.vg :m mzs z mf0 nhnergy

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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 h9a zp-c-+2etr aiox* fu-cd:the speed of the car. Which statement isd +iu 9xa er-*ztpofa-ch-c :2 true about the truck's kinetic energy compared to that of the car?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Car J moves twice as fast as car K, and car J has half the mass of cpdtpw 3wh 4y0oj:w09+iar2i fj- q) pqar K. The kinetic energy of car J, compared to car K0o93 :wtywhpi rji2f4j0- p +q) pwadq 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 of itmd7t1t3f(x iz s original speed. What is the ratio of the final kinetic energy to the initial kinex 7(z 1dt3tmiftic 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 is zt-fl (o t5 in6de dky51eem80moving at a speed of 5 m/s. If both objects have the same kinetic energy, whlnd-ktz0dm foe( e68yt515 eiat 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/sw,p o82gs9 ba9 ,tweto. 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. Wha osb 8o,pw9te,9 w2tgich 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 panic, and skidez85ect7povxrf)0db(mep1- , af ga. a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would0 (a -ppm58 f7ac oe)gv1,bfd r.eztex 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 the Sun in an e z6 5sae74k4l+ dzsaxn9m8fl klliptical orbit. Neglecting any friction effects,9 m6 klz+fke 7l8sa4d5as4xn z 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 princia5p1xz84 xw 9rki:3 e7kiitu yple.
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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 negativecc wt6/.+/e)ga2h) e snftgyl potential 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 s8:u8 y4k. fclnd1 mi :u+mkdwsecond object with four times the mass of the first if released from the same height.f:ukl8u.1 :mik8ndydc +wm s 4 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 caut kw ehyi4rlh+ 0d(cyd:f1 mdy,-u:f9ses it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energd 9 0u,wcy4dyir-dh 1+h( k:t mffyl:ey 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 p;d 13ehe,s)3p tljkc 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 eneruv9 smr3 6wy8*hreb/xgy K, to its potential energyy6x 3uvsewb*r9hm/ 8r 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 drivin,kw o0v1/ x+jr*cojvr g 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 are sliding with equal speeds adw nvg (h9 rpk6j942o1:gsc bhlong a level frictionless surface. They both slide up the same frictionless hill. Which rises to a gd:pc b(9 9rks6wov n 1h4gjh2greater 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 fu7v y.vm p3,tfypz ;2$m_{1}$ 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 8w1 +pnoyb3yno(,(ctvj7eog9 qvya 9 for conservative forces.8(b1 vte7(a,gcnqoy9on9wyj+v3 p oy
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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball falls from the top of a building, through the air (air hj9wxms qp m6:ito;*mj-p8+oec6n0nfriction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potentia0p6-jei6nommjt+;pchws m *nq:8x9o l 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 kinfnjxp85f kh k; 9b;gn0etic energy. Do not ignore air resistance. How m90n; fgnk 5hkbj;x 8fpuch 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 dis t 839.yzzwwjwv4g 3tltance and loses 30 J of gravitational potential energy. Do yw8w. l 43tw9zj vt3gznot ignore air resistance. How much kinetic energy did the ball gain?

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37#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the law of conservatig62c6 osb pjn .l8o*fcon 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 is, / 78 h gf0dsu+drtkmo.ri.vt dlm18v

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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 uni1auu;vgk,d o*.s93- zrwpweits?

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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 kdunt:7 g7u2hi,h 8dcnot 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 woryc bhj o)khwf /t+u.7e bz(z-8k in one-third the time. To do so, your power o(8 -ycuw b jzo/ h7fztbe.h)+kutput 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 engiov:taxwi7:ncdg;+ i7n9 w1rvne 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. *u cg8w7l*g/3 bncbrhIf the object weighs 90 N, c/3c *nu*8wl7gbg brhhow much 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 th.xs+h/a wztvx 77g9y be air a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work d sv7bh xg+/wt7a9 x.zyone 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 10k* ldp7uu i 0:l nx4zsgfv+upulled upward with a constant force of 5500 N for a distance of 50.0 m. What is the work don+g vlxipf0dus*u k:z 4 nu0l71e 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 u pezyg)825vu fpward with a constant force of 5500 N for a distance of 50.0 m. Whatvyp)ef 2zu8g5 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 wis9+b 17g hzhjjth a constant force of 5500 N for a distance of 50.0 m. What is the netg1sbh jj 9h+7z 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 uf fr9zw 36namf5 j hxvsu41ny cu/8s,9p 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 szp4hxp*v8izf;4m6 ei p n*m *klides 8.0 m down a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Matthew pulls his little sister Sarah in p;am+( zq*7o sg4qqft a sled on an icy surface (assume no friction), q +qqtmo7a;p4sgf(z* 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 h539icg 7 ,hmoe kb1afthe direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Findh 7h k3bec 9o1,f5iagm 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. Tsgkc*g/ 6u57r2thu. t dhr)xhhe graph in Fig. 6-1 shows the force vers6ukdg.r72*tc 5 ug) hhsrh/x tus 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 i s-n,buc* kz(jngq(e.n the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 4.0 to ,u j z-(sbnc (ke.gn*q6.0 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. The graph in Figydz.b 3g ca:af6ls29 z. 6-1 shows the force versus the object's position. Find the work csa9 z.adzlbfg 3:62ydone 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 (inx 0lj jdbh49b8itially at rest) across a 10 m level surface. W84j9hl 0bx djbhat 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 (initqvi*ogy. pfl3 plz2*f2, evh*ially at rest) across a 10 m level surface. What is the finaf.zh yi*pl *l *2evv,gp qfo23l 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 requir2 tg -v7b.kw5kxx-a lred to stor72t vkg5xwk.bx-a- lp the 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 vmwfi8/7u 6t)lg sa m+at 25 m/s, what distance is required 8 6a/v)i+m mfs wlu7tgto stop a car moving at 50 m/s under the same condition?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring-driven dart gun propels a 10-g dart. It is cocked by exerting a forcwfqb5ky+) n/ce of 20 N over fy)n5 +wc/q bka distance of 5.0 cm. 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 componennz(5qnqxz +5( h, kigut of 60 N. The force is applied to a box which rests on a +xq,u(h 5i5nq g(nz zklevel frictionless floor. The cart 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 hay,dyd 0+;zromz/qf7 yyj ik 3m;:va8j/l striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the av+3zomkyrjmf8 7dj/yl0 v:;/aid;q y zerage 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 tl v1yn( y ljaxo17t: acl;oz6s h+;pn5o a height of 13.0 m above the floor. What is the change y+o(clal;at6; sxlnp zhvn1jo:17 y5 in gravitational potential energy?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 400-N box is pushed up an inclined plane. The plane is 4.0 m long an/on:jm92b evsc ;.ho br2 z:rbd rises 2.0 m. rmvnr;9e:o .2o hz :jb2s/cbb If the plane is frictionless, how much work was done by the push?

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-kg mass, hung onto a spring, causes the spring to stretch 2.0 cm. Whabcc 7nt;kq(ul2:ug /kt is thebu/klqn(cgck2 ut:7 ; 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 spring cot3ojb;1sn 7o vnstant of 60 N/m. How much potential energy does it store, when stretched by v;3tjsob 1no7 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 uncompressed sprin f(ts mzj:4mm:g with a sprm (s::f jtzmm4ing constant of 25 N/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 constx kem4y24r8 3+ zu gqc0p1ytoax 0-vgzant 40 N/m from x = 0.20 m to 0.25 m? (Assu 8pmoyxcy 4q01g geu43 kx+z-va2z0rtme 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 7s/gl9 *j3ozhe02td 7c8rxso qcqi;d N/m is initially compressed by 3.0 cm. How m7cq i sq;7xh 9egor3t/j*cold zd8s20uch work is required to 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 oc w6ujj8 rf)1the top of a 50-m high slope. What is the speed of the skier on reacho1u6wc8f )j jring 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,y h(2n)n l+v6vk1xmp r pushes off the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, ho6lm+2pyvvr 1n)h x nk(w 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. At the bottom, it has of/mcsy),i 6a,h mh+cw2+f gu a speed of 9.80 m/s. What is tm,h )owgf+a/f6yhucm ,c2 i+ she vertical height of the plane?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1.0-kg ball falls to the floor. Whe ;6p7n.f7m 3yzb 7b-qrbts wyun it is 0.70 m above the floor, its potential energy exactly equals its kinetic-wb3sb .zymtp; ryf777n6b u q 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 strjs,l 5x2j oh ,rg1g,aiaight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechas1 5i,j gag,x l,jrho2nical 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 leavwe*1b*f w kewxch+l;,es the ground with a kinetic energy of 220 J. At the highest point in its trajectory, ibw+ c * e;ww1,l*xefhkts 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 rest atw6k3tye,u nypa2t ,k, 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 above the bottom ofk2,e3yn kuptya,6, wt 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 t5)7q6js dxr hf ++uwxat a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what+qrfth)7xw+ jx sd6u5 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 poin al4x;,/p qr,ze+tcbzjy zt*1 t 30 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be theq,,p x tj*;1ztr4bela zyc/+z speed of the roller coaster at the top of the next slope, which is 45 m above the bottom of the dip?


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78#
 
  What is the minimum speed of the ball at the bottom of its sw8q 60ch altuksc ::(aning (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 *l2.oe;qazu gq:9,l up8zmxme k r86xis pulled 0.19 m away from the vertical axis and released from rest. What will be its speed at the bottom oe* 6uz,xkulq2m: r;9.x oa8qzg 8melpf 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 9 )q jv9ng8pbxm/s hits an initially uncompressed horizontal spring withjn99 xb8) vgqp spring constant of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A driver, traveling at 22 m/s, slows down her 2000 kg car to stop for a red ligimh1,ag )j(ts)q, xotht. What work is done by the friction forc),xj)og imha s1(,t qte 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 bet4h., qo)en(mmq;7ey jbo0du nween a 60.0-kg object and a horizontal surface is 50.0 N. If ;(qm 4ybe0uonqm ,)ohnd.ej7 the 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 moving on a rough, level surface. It ha4ue xo3 vnv-0ks 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How far will iok3-ne0v x4vut 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 app3uwl9a g6 4k3s99vokbc ,( ahdqn+zk ilied horizontally to a 2.0-kg mass on a level surface. The dbi3sw,9unka hzg( o+ kkaq 9c6 v34l9coefficient 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 from rest from+myatz xo3z1a c85zdt vsy96 / the top of a 50-m high slope. If the work done byxv+t59 s t 1ay/6zyam3dzz8co friction is $-6.0 \times 10^{3} \; J$, what is the speed of the skier on reaching the bottom of the slope?

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An 800-N box is pushed up an inclined plane. The plane is 4.0 m long and ri*xgrb;.w4fp 1+mk2uvw b te .cses 2.0 m. It requires 3200 J of work to get mt*r4; b2uvkb1p+w fgx.wec.the 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 abov1yzd6b8 hvwb1bswg- ; e 1b1yz-w 6;bw 8dh sbvghorizontal. The coefficient 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 ground b5.xe5apb y)r with a velocity of 7.00 m/s. What averageryp.eb 5a b5x) 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 h,pke r m yuo-,1t4+olwhen he runs up a flight of stairs 10.0-m high,rmo e1lo pyth+4, -u,k 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 m1zd e,qd4be,v0flo 3to move an object with a constant velocity of 5.0 m/s. What power must be delivered to the object by tz3d04,v ,d mlebqf1eohe 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 mot8b5-gw4 f. 4srrki9vbn6oe tx or that runs for 1.0 hr? (1 hp = 746 W6oxv rfeb4sw 4i.9k b5rn -g8t)

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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. z5r 3w6slz3x0(ci*b9rv (ed bs paw q+How much force does her foot push with when she is trl 9 pqr3d3zr +bc6ab(xesiz*vw(w 0s5 aveling 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 the ax (/n2 m4 pk.cvc8hdylverage power delivered by the engk.cly2n p(dv x 8/mc4hine? (1 hp = 746 W)

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