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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 expresscl 53qb -f148evix caied 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 the2.gi 3mpx/jr qre 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, the amount of work 8e kd3wjf ooff y1k8b 305 kf)p;tch8qyou yc;3odjfb8wp q)3k08 fofkte5 f81khdo

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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 be+a;k45 /u1j:qv fh ese,redj zing held there. How much work is being done in holding the box in this posse4ak: efj/eh15z,;qju+ vrdition?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you walk 5.0 m horizontally forward at a constant velj 01::dv u0 odhpxr cbehhz395ocity carrying a 10-N object, the amount uz 010h:5hxcd39:e hrpovbj dof 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 vertical6 nqagrc4n. 8gihk2 k tg,yz.)ly 3.0 m then returned to its original position. If the total weight is 30 N, how n8k6.qk4) . itngahzy, 2rcgg 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 objec 3/ 2xha+8bl eif*ymen fi5tx/t 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 the2 izg2(yny ew2 krp )us32vhf9 sign of the work done by gravity while the ball goes up with the sign of the work done by gravity while itw2)sgziy 2 ryp(n3uv29ekf 2h 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 ilftf,w p,7+ y(F vs. x) graph, representsf ,f tw+7pliy,

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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 (u ij 2xzuy*+ddki;n+ vs. x), what represents the work done by the force k2 u(+ydun*;zd i +jixF?

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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 kinetic kbt- e+bdrsrh0 45:mcenergy

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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 an5eo;b o5s(q kg object is negative, then the object's kinetic energy

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the net work done on an object is zero, then the object's kinetic energy ,p-- pvyue2o-u3egvh,wjm( f

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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 twi r ahyer.pws;-*zo* k:ce the speed of the car. Which statement is true about the truck's kinetic energy compared to soke-r*p* z;a:wyh.r 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 up(- ldc wl;+qfast as car K, and car J has half the mass of car K. The kinetic energy of car J,-qw + c(;ullpd compared to car K is

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object hits a wall and bounces back with half of its original speed. Whas2 *cntrjwy9jv2eg2*1klgszv. 7 w/ k t is the ratio of the final kinetic energy to the initial kinetic energy w2kevwkrs*.j zgc1s2lynt/* 27gj9v ?

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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 wobf0dvred;y1pl bm (9j, + wowt4z:3is moving at a speed of 5 m/s. 0 l;bjw94:d, dwfy r zp1bwm3+o(t voe If 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 speed 2.0 m/s. A 1.0-kg massi9 v1un0,z+c eo 64ulg vc; ytym+g2ds is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before stopmd1 t veuz y9on0,c ylu4++;6s2vc gigping?

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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 in5fv(9 vsqkt q- a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, underfvq tsv-k59(q 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 wz4z(ch 7 *dlvok:g8 twz46wkan elliptical orbit. Neglecting any friction effectsd*z4lzhw co(6zvw g k 7k8t:w4, 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 pri ;u8qqq 3eb;jh0.w wjfinp 80dnciple.
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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 yn4m/ :i4buoe 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 gr nq5 wqo5 h .xsi6e;k;8cxgxw:ound. A second object with four times the mass of the first if released from the same height. The potential energy of the seco 5 sh6;n oq5xxkq8;:ew.ix gcwnd 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 it ui82af, 28u9 gj.q/giqawn uoto stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the.,9f/nwa2 uaqi u8ou qjgig82 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 systa 8rl 6zd4uzbnyjj5s *a3 *l)pem

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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 q-f )ja6tbgj pg3l9sn )c*io*, to its potential energy U) gpfst6cg3no 9il*ja*q-)bj.

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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 :bq// v0rqllbjlw:ti . 9qfibc)mk),driving 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 alon(jv )02e ;pdtzb-cikq g a level frictionless surface. They boti-0k d)z v2tb(; eqjpch 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 kcom0xjj:t2 ( o (cbg6$m_{1}$ 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 conserv 2yjmyc z;y:ha k+.n6hative forces.z2yj c.yykh 6a+n h:m;
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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 (aijvyj cf+8-l y7r friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy f j8v c+-ylj7y(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 g*tqqfrg )92g gains 30 J of kinetic energy. Do not ignore air resistance. How mu fq*rg92g) gtqch 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 ene3 pdlqu svvk:a*7nk 8(rgy. Do not ignu3 adnk 8*:(kpsvv ql7ore 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 conservaysd4 ecz9fk +3 gr vrg k(u6i1d+2ef1gtion 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 isa51wg usol6v;8 njk16x vp8l e

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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 unitsju;;h5;7bvdu- vl eci?

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Of the following, whi- o- kgi 1vaik1-fyx3dch 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 the work in one-third the tig;o, tct 4jnx1me. To do so, your p g to,;xn41tcjower output must have been

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  To accelerate your car at a constant acceleration, 04a8h+rxvw-r,g xrs rthe car's engine must

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is lifted vertically 2.0 m and held there. If the object weighs 90 u-uiwc*gk a f8:z6p.w N, how much work was donepfu c-:ui*68wzwa.g k 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 thv0mn 2k,cep. pe air a distance of 1.0 m, at a constant velocity of 0.50 m/s. What iep,.c n m2pk0vs the work done by the weight of the book?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled upward with a constant force of 5500 N for a distan5jmop1p***bbo;k vj z na-nh9ce of 50.-oam hz*bo ;9 k*j n1vpbp5n*j0 m. What is 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 5500n5 rv1:5/jhs+69 swtvlvoe bp N for a distance of 50.0 m. What is the work done by the weight of the el p6/: no+v 1wb9vsevh55rstljevator?

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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 for3jskhwhk- hf- +1 qx; ewd)q;oce of 5500 N for a distance of jxfsh -eok1)hqwd+;w;-3hq k50.0 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 alonf) qii: bjisq;/t,(r3 q) spyxg 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. wbb-gf l165mq0 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 iw9gid(f5fdg q;5turkh, + +ua sled on an icy surface (assume no friction5 u9tgrwk ++g5dhf;q ,di(fui ), 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 direction of the f q0n cx kitgg ;xnw9-s+7au,s9laj /u6orce. The graph in Fig. 6-1 shoawg x; sx ,i+kcqn7-u tajuln990s/6gws the force versus the object's position. Find the work done when the object moves from 0 to 2.0 m.


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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the force. The grajabd)zjg(,/b. f96pc: bpeybs pi.,i ph in Fig. 6-1 shows the force versus psceyb.ijb p,:z b6/,(9f ij)b dg. apthe 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 force. The graph in Fig. 6-1 sh ,mlqiaqqi1,-d,d bvgwh+.-zv gt*n 1ows the force versus the object's position. Find the work done when the objeh, v*i 1gi+dqv-t.,bmlz,aq g-dqw1nct 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 d6gj j6pwfe; 8birection of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the ;6pjb8gf6j wework 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 3 gi2 /*qw/s-w qso-pglh*o unto move a 55-kg cart (initially at rest) across a 10 m level surface. What is thosnw*q2pws q* g3ho i//g --ule 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 , xad;1tw3lje-kg cart (initially at rest) across a 10 m level st1d3xjw ale; ,urface. 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 toz5siz4i xq0(d stoi05 dziz4( xsqp 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 initiali0 n/ plyzd dt9)q8pl,ly moving at 25 m/s, what distance is required top9qy0nz8ti,/ pll d )d 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 propm/hye a; mah- yr.a..sels a 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, yr- ames.hya/.a;h m .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 vertid.0nqtht *1fd j sou65cal 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 horizontally along the flo0j*dt6h oqn5 fu1. dstor. 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 f:r.7kq2nrh0 iwtx.kg is shot horizontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a fin.k.kx rrh07w 2tq: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 a5bl,xje i-;f.8muvee pd6i +height of 7.00 m above a floor to a height of 13.0 m above the floor. What is the change in gravitational potenfe aimpee j+x-dl ;8 u,.iv56btial 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. Th hruxpc.z, k1;e plane is 4.0 m long and rises 2,u;xz kcph r.1.0 m. 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 spel5r1hx3a 1bub 4en*fring to stretch 2.0 cm. What is the spring abhxueb4fn1 13e5rl *constant?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring is characterized by a spring constant of 60 N/m0o1 drz d/vuygk6;n3,;)hv 9 grbrtr l. How much potential energy does it store, u;ry)r9ldn/t;6g hd rvkgzb r,3ov10 when stretched by 1.0 cm?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Calculate the work required to compress an initially uncompressed sprinje)/93mkn hyr -of. kag with a spring constant of 25/rho-. n3)fj 9ky emka 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 stretcq;:r4k ,kc w i0uygh1ch a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretchwh:;,c40cqrgukky 1i ed 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 N/m is initially compressed by emcbc9doycoua,yh5- +7- a ba5 86fry.nh7m l 3.0 cm. How much work is required to compress the spring an additio5hleydyay,bc7u6a nr5 h cmab9--fm7 8coo+. nal 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. z st7;,fz:ve* yqbb+u What is the speed of the slier b+zyqv e ;z:b,tu*sf7on 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 ini 4tz pqf hjur3n9l-5;ntial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping95u ;n3rpjlhqn4tf- z 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, n1 ip8;7e*a bxcp9xkuit has a speed of 9.80 m/s. What is the vertical height of the plane?;n k xacbi9*p8x e7up1

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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 06s +ndfvb p12u.70 m above the floor, its potential ev 6sd2 pfb1n+unergy 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 straight up from ground level with a /x7smphi g ) 9p)vbt*p4u0e fwkinetic energy of 4t eu)hx0b/4)fmps v iw79pgp*0 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical height does it rise?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A projectile of mass m leaves the ground with a kinetic energy of x 0.1vv.f; nves9wzvw 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch point, did it rissnvwv09.1vfev zx ;.w e?

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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 ab.u :cnoc5gav7 ove the bottom of a dip (See Fv: cucg57. onaig. 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 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 bottomtwx)f*2e u lb8 of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slop bfte8) xl*2wue, 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 muz:+.2 0si r qhx2tvla point 30 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 coaster at theqm. sl u:2rv 2ht0x+zi 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 swing (-h. gj)mz rki9cu4 /eupoint

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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 yi5a)51 tpbe-f hb8hx 0;mxceo 8bcl* the vertical axis and released from rest. Wha1 ;eycbh x l0fptob x)mb5ce *8i-5ah8t 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 hits an initial8g-z* z-pkffuly uncompressed horizontal spring with spring constantf-k*8zzfpu -g 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 mb nqz+v6aay ;)/s, slows down her 2000 kg car to stop for a red light. z+avy; a)nb6q What work is done by the 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 between a 60.0-k ;7*(yt wbi .mqbcb0wyg object and a horizontal surface is 50.0 N. If the initial spee70tw* i;y( .bycbqb mwd 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 movingkvg 0ell2 g l/;fwcn mc6*6y1n on a rough, level surface. It has 24 J of kinetic energy. The friction for6 n;0v1c*ekwglc/f26ln gm l yce 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 2.0-kg mass *e,gcol/(nk1gr t js-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 change in its kinetic energys *g/,j( r-ont ge1klc?

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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 50l55 gqci-m/bv pmcd24-m high slope. If the work done by frictio dv5b4-2/cpc glm5m qin 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 i8 o7six dptselq;/ d- ;.,3ivz qqx(tts 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of thexqq ;/ tqxpletv;sz dot i,(i-7d.s83 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 releasemplo.qy 4 4. 1ghl(uprd from rest at the top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is u(4q..lhorplmpg 1y4 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 grxu 5(5iltgl biu,0ji;ound with a velocity of 7.00 m/s. What average force of air friction acts on it as it x ujll0i ; 5gi,(ui5btfalls?

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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 rbacn601 nvr 52ffg1n5 mf68zm+n btzhuns up a flight of stairs 10.0-m high, inv1gz28n a5 f0mn h6cr 5fm+bn1b z6nft
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 witdvu+ 7ggr a bwz5lxn5:mx;, )2wy+mhsh a constant velocity of 5.0 m/s. What power must be delivered to the object+x5lw5yb;m7vza r,mdnw +):u g2xhg s 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 1j;m(dz hl7:za wu*/kxl8) exm.0 hp motor that runs for 1.0 hr? (1 hp ): l;8 w(7ukzlxx mzdaemh*j/ = 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 force dod8ed4:vc9 citch-z ;79 rbwqpes her foot push with when she is traveling qc8 d7cwhcz4et d99i:br; v-p 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 k :kjj-32 (bs0thnfbu7.0 s. What is the average power delivered by the engine?jk-2sj(kfb:t 0hub n 3 (1 hp = 746 W)

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