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习题练习：Physics Unit6: Work and Energy
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 作者: admin  发布日期: 2022-07-28 12:33    总分: 95分  得分: _____________

答题人: 匿名未登录  开始时间: 22年07月26日 13:45  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the correct unit of work expressed in Sgi7 mipl z aho0/u)i0 )(hgn1qI 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:jsbymk/b (1lmb :v b5 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 xxpwd/ )z:mlt;.yu+;ta j:rn hard against a stationary brick wall, the amount of work yo;)nx /;t. y:jrl xm+tuwa:pdzu do

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 50-N object was lifted 2.0 m vertically and is be t npx:mj3rcjn/m(:2iing held there. How much work is being done in holding the box in this positio c2(ixmr 3/tjnnj:m:pn?

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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 velocity carrying a 10-N obqol y.u. -7)bpk7gd tdject, the amount of work you do.7.) 7u-ldp g qboyktd 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 ax5 c6 6yl2 t:sdhhi2y6kx*et 3.0 m then returned to its original position. If the todhsy2lyt5: a2t 6eckixhx66 *tal 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 object do work on the objec9gqi 2qk 0s o+l15f:m yguf4pft?

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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 gvakhjo:0(;h q uv8;mokhr p 9)ravity while the ball goes up with the sign of the wor;uk;(hhho8q jv )ok pa:m 90vrk 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, ono+x.4d p+(5 lz 0csgs htviso4 a Force versus position (F vs. x) graph, representsstipxo d.(05+clv shg sz4o4+

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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 taohz z t2yzp3a9 na;82hhtz 2paa38 z2oz ;y9nae 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 is positive, then the object'syt;f izgi 5+7s 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 k-kgzp/)xjs bm58*z l9fe0dn on an 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 objecds;oq(64-lfstp wg:/ 1wehj xt is zero, 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 aan w46w ipe,5ht twice the speed of the car. Which statement is true about the truck's kinetic energy compared to that of the ca4p ew,iawhn65r?

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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 2zd.d k87p luzcar J has half the mass of car K. The kinetic energy of car J, compared tok.zlpdd8 7zu 2 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 i 5 8bt:ef u*rcix)duc:bpe8 i2ts original speed. What is the ratio of the finalcbri58*u):u 2x ct:bpe 8edfi kinetic 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/s6z+emi:p :pbukat uu)h : kc(+ysy7n3 and a pebble is moving at a speed of 5 m/s. If both objects have the same kinet:+z7ti( hna):pcpy6k beukuym 3s:+u ic 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)+ dzzjw3l fina0xr11 /s. 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. Which object travels the greater distancldzrfji1z130 x) naw+e 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 sk9gkl 4ueg1osi,n7d,g s;d0 p iid a certain distance on a strai so,0g4nk,id e1usg;9gl7 dipght, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the same conditions?

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A planet of constant mass orbits the Sun in an ellipticalz .n,(vssh v*l*nt9igz f ;p.k orbit. Neglecting any friction effegf zl*9v.vnpn.s z ;khs(,*i tcts, 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 , e:ff 9i; 1plj *h6osaephea)principle.
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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 n1nkj94 r t3r 3gbbgop0egative 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 abovgsksq:) tcr/1 e the ground. A second object with four times the mass of the first if released from the same height. The potential energy of the second object compared :s rts)q1/ckgto 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 to stz.odoxb-k h(7 retch 5.0 cm. If another 0.200-kg mass is added to the d7(o kz.bhx -ospring, 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 energeob cn )6s/c.oy 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 pote6* p9idz/qhfbz6sn n2ntial ener9*26pdb nhnfzqi s/z6 gy 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 cif/mkal )p2 3 ay9dms2ar 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 slidi utt20y38 d-y:kdtfm jng with equal speeds along a levmk:jy-fdt dt08 2u yt3el frictionless 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 0xe.9t. e isb;i sl ghdxraat7-)f+y5$m_{1}$ 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 conservcb3kxwm,4 ji 1ja9vzxkd0j-qat9; 0s ation of mechanical energy for conservative forcesibq0jz91s3 ,9 j;ajk ka xd40m-cvwxt.
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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 frict( tw+ gid*,t2rjgu qw,ion is present), to the ground below. How does the kinetic energy (K) just before st, rtd +qw,t*i u2g(wjgriking 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 not ignfzct34rte* u5o7rcr1w1d q9 l y,x(fk ore air resistance. How much gravitational potential energy did the ball leorttc 7furq1* xr3,w c945lfy1d(zkose?

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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 d9.zd;-+curr hf svg5 of gravitational potential energy. Do not ignore air resistance. How much kinetic energy did the - v5grhu df+sr d;cz.9ball 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 energl/,) c3e4yhm/ssg j87omm odhy.
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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:srq 1f)s0+ qc fn,lfxlw- 6

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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 zx*s8ru j7u 595cycs3ktfley: v.y8 hunit 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, which is not a unit of po, o8ri/,3vpcchiaqi 3wer?

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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-)5lcjz n(2q;)4l wb(gh zmg2+ o zzoqithird the time. To do so, your power ou5i4lg)2q 2)goq jwz n(;mhco(+bzlzztput must have been

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  To accelerate your car at a constant acceleration, the car's engine mus)3/k kmh 9nczh yy ro.3iju7k6t

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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 weighssvp5j l1du x). 90 N, how much work was done in lifting itvdx 1pl)j 5us.?

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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 u zddcvi73,i) 4yyh,dgp in the air a distance of 1.0 m, at a constant velocity of 0.50 m/s. W4i3id y 7d,dchvy)z ,ghat 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 upward with a constant force o,g lia 5mo2;q)iy4- .ovdbp fl6f( jluf 5500 N for a distance of 50.0 m. What is the work done by the pjl25 vg(6ol of4i,yafq mi; ldbu)-.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 wi hj+.urp2zjeo85dt,.d brh j7th a constant force of 5500 N for a distance ob zo,.+ r8dj h.ue2j7r dpht5jf 50.0 m. What is the work done by the weight of the elevator?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled upward with a constant force of 5500 N foqzqwb w117/ zbl2pc xex* tr5f q34u8ar a distance of 50.0 m. What is the net work2wxac3*1r f5q /wz1e q8xbqptl u7 bz4 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 a xmqj-4-a h-ibgo*r,z8 papa +$37^{\circ}$ 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, inclined z rmotnm0c/j n:tukra)uy6 .rqqwe6 p-,05,eat $30^{\circ}$ 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 h:c1pdtnr (5c4fk(l (rr wmf1Sarah in a sled on an icy surface (assume no friction), with a force of 60.0 N at an an (ck5pnctfr 4l11 r:wmhr( d(fgle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the force.vffxe9)+ 0nxks .9, cbov5qtz The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 0 to 2.0 +c qtfsb9vzx, k59o).xef0vn 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 forcega,h/ xv.,0 5osvl il1w yk4a )t1ejih. The graph in Fig. 6-1 shows the force versus the object's positi5 yx) ohh1v4ak swati0l vil,1/,.gej on. 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 o* t8myc q4nuw;f the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the woq c *8ynwmut;4rk done when the object moves from 4.0 to 6.0 m.


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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the force. Thgo4 :kxh l1f,,im 3l9ellxye;e graph in Fig. 6-1 shows the force v:, ,lliy;4e xo g9fx3m1 lehlkersus the object's position. Find the work done when the object moves from 0 to 6.0 m.


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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force of 200 N is applied to move a 55-kg cart (ini4nlpy w f)+ 4pwal7l 9wnrm(.htially at rest) across a 10 m level surface. What is the4w r h.+l)pma(lwnpf 4yln7w9 final kinetic energy of the cart?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force of 200 N is applied to move a 55-kg cart (initially at res ic.ww l5wnbpt7xu,+xu 30h bd:5jc 0mt) across a 10 m level 5 +d xn. w7lxubc 3w:5utwh0i pbcj0,msurface. 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 5z(d)wm2 teqp5.0 m/s. How much work is required to sto mdt) 5zq(pew2p 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 at 25 m/akse: y)(qa.b,xh h zah6w b7(s, what distance is required to stop a car moving at 50 m/s under the same condqawha , b.hehx:k)bs76ay(z( ition?

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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 g6ucz6ico4:vu /3 beypp kh-d, j7ak9wun propels a 10-g dart. It is cocked by exerting a force of 20 N oveipdz 4-,ju39c/kvhe6 bao wc7ky6 :upr a 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 com,pm u-pzm0d(tponent of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m hor tz,-pmu(pd0m izontally along the floor. What is the cart's final kinetic energy?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An arrow of mass 20 g is shot horizontallczokc:p/1:1rlh5 j9sz.v mhx y into a bale of hay, striking the hay with a velocity shr c 5/chz .:p9zjmk1lovx:1 of 60 m/s. 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 heigh8a,.4 yw ev/p4:nxw8lma bn;a, hnfk ft of 13.0 m above the floor. What is the change in gravitatio4f.lpn;88 w4 n, ayxaba,/mwh f:knvenal 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 khlf8y,,ts02b w2js oup an inclined plane. The plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work was done by t t8w2,2,bjohly0 fs kshe 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 23:26la/p l o cv os90yj2xizp+bbcys ).0 cm. What is the sprinbzbcv /pj6 l :)sl3a9xco20+y ypoi2sg 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 o0- ju7 f,*zc cbpmh5qnf 60 N/m. How much potential enczpnu-j*57fcb 0 ,qm hergy does it store, 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 uncompres;q-z ,qgjxan -nb8 nx n,e.*(-kaduuysed spring with a y 8n-xqj. z,annb(uqukn; gd* a,e--xspring 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 swfi6m b x11v stx/tuh4c 4)/iapring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume th/1w6/ u4f atxi4t )hm1vsixcbe 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 x;6sk pg-h;+7i*qta) tv bb)d iisi2q constant of 15 N/m is initially compressed by 3.0 cm. How much work is required to compress the spring an additional 4.0 -a;t 6)+bp hgiv dxq 7q*ks;t)iisib2cm?

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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 topp:ltsvktpft7,d6 07c:w k5djvqc70w zj jq/: of a 50-m high slope. What is the speed of the skier on reaching the bottom of : 0 5spltc7:vjj,wc7:/ vtqj 0p76qwd fzkdkt 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 initial speed q0vv2)t 7z)3lry b-tw vymk4ntv6 bz-of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m )v tz v2 twz-yr3mq b6vty-)0v4klb7 nin 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, 3iib mw)pmcn66u a* 1wit has a speed of 9.80 m b6)cnm*3iiuw pa6 1wm/s. What 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 to the floor. When it is 0.70 m above the floor, its potp1 wiy1g/4t(g c8ds4 /4(taz zqoli kbential energy exactly equals its kinetic energy. How fast is it io1 /4s81 wgbi(/q(zak4cttd zpyl4g 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 gro)c+e13yqf+t rov;px , glok:ound level with a kinetic energy of 40 J. At the exact top of i1: le pv+;xf+ktq,yoorcg3 o)ts 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 220 J. At nz d jwc6phkd5f3+1v hlk c5+5the highest point in its trajectory, its kinetic energy is 120 J. To whap5dwc+ 556+hlv j1d n3zfkhkct 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 frs+cf,g; mt n6som rest at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect fr+s; ,g6 fmstnciction, 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 spee7, ava /7.o/f ofmdnvxd of 5.0 m/s at a point 45 m above the bottom of a dia d 7,xv/7afm o.o/fvnp (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 of the dip?


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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts at a point 30 m above the bottom of a dip with aljmp yp0li-9o)1pgh 0 speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed oljhpy-li90o0g mp p) 1f 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 bar rb8t 3n(2udy8l;b oqll 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 2-kg pendulum of length 50 cm is pulled 0.16 m away from the vertical9d4a dm,sxv6jwa. d r409ie mb axis and released fr d4 m 9r4wb.mv9,6jdiedas0axom 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 hits an initiao/4m*mk 7sp5v k/nbgklly uncompressed horizontal spring 7mosk/p gn4 k/ kb*m5vwith 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 stjm w ibmk2xq;u( -p-d:op for a red light. What work is done by the friction force against the whu:2pw-(m k;bjidmq-x eels?

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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 horizontal surface i,akd7np llluh8n ;kzh 6n- /.ms 50.0 N. If the initika-hl.hl8n;m7uk nl /zn,d p6al 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 rough0mqq2dwh. qb ,n84 qra, level surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How h q80 a4r,qqnd w2mb.qfar 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 appld*;ovy- z )cbmdwu07w- ;kcq cr:vz3oied horizontally to a 2.0-kg mass on a level surface. The coefficient of kinetic frictio3 0*z cbo-wz-ryvvdcw7 u kc od;mq;:)n 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 the top of a 5e,8cwr/st m.f ll2/p ;ue d,sy0-m high slope. If the work done by friction is pl;2d/wley8u em s,r/.ftc,s $-6.0 \times 10^{3} \; J$, 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 lonx:0rgliafb 07j t,ous k gvuf5 +x+7(0w*rsa ig and rises 2.0 m. It requires 3200 J of work to get the box to t 5+jfx:s sii a0uw+ kt7lfo(*grxrabg 0v,7u0he 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 inclid a12zzlgov7y21 vfpt, 0 )chrned at 20e above horizontal. 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?rvzpzvl2,o 27hyfd0c )1ag t1

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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 with taq )0xc;:vli a veloci: t; aqvl0x)city of 7.00 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 flight of s o(jg fv7es90rqr 3kh2tairs 10.0-m high, inkevs93r f( 07hjq gor2
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 needen3c0- o6q3/gk 7pye1sw lhf /9fznr hdk 6g8jqd to move an object with a constant velocity of 5.0 m/s. What powe7 od hqf se6-k9q6/ 801g3zwnjnr h3cl/gpkyfr must 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 motor that7l. 2q5d pu:v qygll7c76bhpw runs for 1.0 hr? (1 hp = 752 ghp cv dp:llwl. qq67b7yu746 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 m9u2 f 15zb(cvmyra 114heilhnuch force does her foot push with when s(1a4cyrhm eb n5211 lf9h uvizhe 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. Who8pg8fd *l ((h5 emhmswia;v4at is the average power delivered by8 ;h8a i(w*mfv smhpd 5l(e4go the engine? (1 hp = 746 W)

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