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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 of3 8g8 r-lns tn,8q fkiqx2fo-z 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 systeyp tbl,3az+l* zeg :)um 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 stationx bhkyoia28 1 n5t 6hcu*h.)gdary brick wall, the amount of work yo*8tgo)56.1hu2h xak hb niydc u 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 verticallj 7,gp /ox s6l9i.mftsener26y and is being held there. How much work is being done in hol6 enlpxg6rjf/io 9se 27 .,stmding 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 forward at a constant vel n3yol8v)n dc(r y(tn+ocity carrying a 10-N object, the amount of work yo(dn(n)r 3tvoly8c yn+ u 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 3.0c o.jv2+8j nl ys*ct6w m then returned to its original position. If the total weight is 30 N, how much work was donw. 8vtjy+2ocncl j*s6e?

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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 actioty7 u o1 wj+mwx9s6 kk(z+ig:ng 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. Compare the six3z koi v-vr9:gn of the work done by gravity while the ball goes up with the sign of the work don3vvo9kx ir z-:e 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, n :jqpez(ch/ncf 3 e(7representshc(jc/pze:fq3n ( 7 en

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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 :i3 k4t9hybsfthe work done by t tsf:43iyh 9kbhe 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 posi f)4yv7;rftg, 0iubr htive, 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 qqhl/ ett)fozz:8o. nsbp .p8d8: tw+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 kineticd ph(l:d69q.zgh5p sx 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 c nx(bats+l8howp5n )* vf l3h z+e0;owar, and is moving at twice the speed of the car. Which statement is true ab+nz8 xa)wewh5tnb* 0p l(oos;lv+hf3 out 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, anlimn/ad7hv 50ib (4w ws; ,czdd car J has half the mass of car K. The kinetic e7i50lv4hb,s/w iz cawmnd (; dnergy of car J, 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 or+ hzit: fi)uv3.deak /iginal speed. What is the ratio of the final kinetic ene.hte 3fdi+ :iaz/u)kvrgy 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 ofgovpw ok+*(loz/0(ja 3 m/s and a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to th/ 0logzv (*a(poowkj+ e 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 mass is moving*ss+xifp5/r h with speed 4.0 m/s. Both obj hfssp+*5xir/ects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before stopping?

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You slam on the brakes of your car in a panic, and skid a040bp*oejjp a certain distance on a straight, level road. If you had been traveling twice as fast,4ap*bjej0p0 o 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 gntp+vc-zp -3 elliptical orbit. Neglecting any frictt+p3-cz g- vpnion effects, what happens to the planet's kinetic energy?

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22#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the work-energy prindswr/ 4*9dnnxciple.
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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 negativ r+etdrb78*qhwho: p* md(dp,e 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 x beuyt:z7 t1q(6; c6nvc;br u ltf)4bh above the ground. A second object with four times the mass of the first if released from the same height. The potential energy of the ct;6)tr 1betcby4u: f;ux q vbl 7zn6(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 sprig6ylsi ;6dg)r7 zua7zng causes it to stretch 5.0 cm. If another 0.200-kg masa u7zg6) s rigyzd76l;s is added to the spring, the potential energy of the spring will be

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The total mechanical energy ozw ,q1o y:r* h)z*5b jehvoqeosbr+56f 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. Compx5fkp. +8+vyoi w2qwzare its kinetic energy K, to its potential enervkw 8+ +p .yx2qfizwo5gy 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 hillw4,qtl 4 o/e tzt*gg+e.

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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 al0 (0vaarda9v (z 9kacxong a level frictionless surface. They both slide up the same frictionless hill. Which rises to a greater xa9z(kca(9da0r0av v 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 s-hze.- *0yg z kiai7y$m_{1}$ 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 o0 h0owrev3 u/l.k 5s:bwlhw (jf conservation of mechanical energy for conservative forceswrh/sl3w v .oh wkj:0(ue0bl5.
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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 airlm:e1e- nyq(ipn:)zp y 4q bf/ (air friction is present), t m-ql(z1: e/4iy) yp qbenp:nfo the ground below. How does the kinetic energy (K) just 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 di3w 2kkv ;k/yske1lh6 istance and gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential/ykeksvi; 3kk1 6w 2hl 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 3jsjn q )w: (y33wiahqgravitational potential energy. Do njqnjwsya)q(: iw33 h3ot 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 conservation of)m jj 7i//jfhn 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 isi j 4s xoixnayjy8*+qw1ai1on4:d ,2u

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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 pos6 9.+kn8bp8yyugzzzalo f2)o k:y 3i wer 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 podp 2 j/jlwvt( f(k0b+awer?

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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 govy2g/-l j p4cp3z m0. tv9zktimes the work in one-third the time. To do so, your pow m/vgc3 kp4z.0lz jop9y -2tgver 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 accelerationy4( bfve;1fn+ n*uz,h fyg1au4x5mqs, the car's engine must

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is lifted vertically 2.0 m and held there. If the opnp g//g xg8eehw/ab )a5, ppr;+uc6 vbject weighs 90 N, how much work was done in l5pvhx/wg npbgac/8 pa u/+pg;ree6) ,ifting it?

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You lift a 10-N physics book up in the air a distance of 1.0 m, at a constant (vabli0 tk(,9zthc ud7jf+m0velocitjfd 0m ait h 0k79+bt(,uz(vcly of 0.50 m/s. What is the work done by the weight of the book?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled upward with a constant f*, gwi8:l0-c9mh pvmu 0egvn korce of 5500 N for a distance of 50.0 m. What is the work done by the 5500 N fon :0wimc*,pvv k9l-eg 0m8gu hrce?

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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 .kb hlh4zqu.w m0e a7f)f7l o85500 N for a distance of 50.0 m. What is thokql.7h74be .a80uf) z fwlmhe 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 for a distanrpf2 m;1eb,co ce of 50.0 m. What is the net work done on th, emprf;2o1 bce 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 alo9elxy3q 1-ac q(ol g+sf :y,ning 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 :m9gf- nfmp/, k*kg wcslides 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 a sled on an icy 23e, pjh/zbe fsurface (assume no frict2zbeef,hp /3j ion), 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 gp1wk*cgg.5kbvk0 + 0pdrve (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 0 to0vkd0+.rc pgvg (kpw*be k5g1 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 direc rfb niyzg))om-0:0xc2f fev4 tion of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find th)gvrc42m z i-fx0 eb)fnof0 y:e 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 graphf1 ndma..8 qy)n( mrsd in Fig. 6-1 shodd..m 8r faqmy() n1nsws the force versus the object's position. Find the work done when the object moves from 4.0 to 6.0 m.


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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the force. The gn h,:9agz*flmraph in Fig. 6-1 shows the force versu 9nzf:ag,*mh ls 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 otz0x/ qr;j 4zpf 200 N is applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the fin zpx;zq0/ tr4jal 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 (initiallxb 20cm7vb 8j 5ow2fswy at rest) across a 10 m level surface. jomx vwcs2 w 5b2f8b07 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 tzui2d,.e rej-jff jln qs;0/;03qaq mo stz j3u2 l.d/q-q,r;0jqie0nme j; sfaf op 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 ir3v 41xqxn5zc nitially moving at 25 m/s, what distance is required to stop a car moving at 50 m/s under the samec14 n 3qrxx5vz 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 l4/ mi7yn0ri vgun propels 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, assuming the spring has negligibll4i7 0v yrn/mie 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 component mb1kblkjod3 s0hr2 +p11/qjx of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rep j3js1+0r1d lbbqmxo2k1/hk st, 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 sh yj zc.yzpi/f) mm5(j7jhbh0 9ot horizontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stoppin/7. )mbpyc fjh9j(h0 5 zzjmiyg 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 c t3;ql6s i7xqa floor to a height of 13.0 m above the floor. What is ttl7q3 6;sxci qhe 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 ieig5y6-sk( y7dz3o,5 ddqe2e 2c d ydunclined plane. The plane is 4.0 m long and rises 2.0 m. If the plane is frictionl,d5 ezo3u2(-eks5cdd gd7yy6 y qe2diess, 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 theo *x teono+3h (6pm5yq spring to stretch 2.0 cm. What is the spring cons+6oeh(oqmtx5 pyo* 3 ntant?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring is character/i .va p5f4*t .pnkf dgqvvi*4-4pbydized by a spring constant of 60 N/m. How much potential energy does it 4vpq/ .-gkn *vpfip*4b a 4 y5tvdf.distore, 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 in:*np/ 5peqvxmitially uncompressed spring with a spring constant on x5*:/pmpe vqf 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 springjnjow tnk9- obq*7,. vzwng1) of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unst,k ozq1ngw b)ov9-t.7n*jj w nretched 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 ini i-7ivvq n ,z)6o*mwintially compressed by 3.0 cm. How much work is required to compress the spr imn*zvi6w -ion7v),q ing an additional 4.0 cm?

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 60-kg skier starts from rest from the top of a 5c. k44 sqxeu9e0-m high slope. What is the speed of the slier on reaching the bottom of the slope? (N u4qc 49exkse.eglect 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 wit*bgaw v/ poee;zx6llih k(d:l-14/e th an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 10 m in elevbd/kva1l /l *e(z:goi-; wh 4txp6e elation?

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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 plane5e-tvxcdr wpe54ah a k,bn4mv2lr398. At the bottom, it has a speed of 9.80 m/s. What is the vertical he525 evamxlceb-h v4, nw9kdt p43ar8right 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+lur: ef0l/0 .y)jjy rto j*fcn it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How fast j/cf0ylrfor):tju.+y 0ejl *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 leve:zaugt+9ns-p l with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical heigan +g-9z up:tsht 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 ;z0/3q1odr lczahbm:220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch pdo:1cz03rlq m;hb za /oint, 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 aboegu;w46xlwue(, )q. e jih/mu),y icxve the bottom of a dip (See Fig. 6-2). Neglec h6u,wijiuecwe ( x l;4mue,q. yx)/)gt 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 po(i2n/r, xqdd oint 45 m above the bottom of a dip (See Fig. 6-2). Ne xq( dno2/ri,dglect 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 poifx+ ,g pqxl 9(e80ygcynt 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 spep8yy+ q lgxe(f09gc,xed 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 swing (pol/mqs6 +n)qmr/x3 +tp9/c+zeq 4 jtdl u6s rscint

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A:2.2 m/s

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80#
 
  难度:2

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pendulum of length 50 cm is pulled 30 cm away from the verr, b7 k esffwwh/b s(;gwe32:gtical axis and released from rest. What will be ib(b k2h :r3/f sf eg;,swwe7wgts 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 initially uncomprh + 8plf8jz 5c0)5mkp6vrwqts4ojzc+ essed horizontal spring with spring constanjprm sk6ct 8p5vo) zwcfql+j5z480 h+t 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 tofr r.9c*mrmycz-1e u(j h;y:b stop for a red light. What work is done by the y(rcu.cf;y*ej9br zr1hm :-m 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 i w g5vgj4jx6b5/svk(b4le8n60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slidbg5 v6likb54(vsgenx4 8 / jwje 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 has 24 J of kinetic ener 9a fop8+f0avny+ .oopgy. The friction force on it is a constant 0.50 N. How far will it sy 9f vn fp+8poo+o0.aalide?

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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 on a level surface. .z+6 5jk ejkq*jrhxg1*s1ymi Thesx*qj. yjhgk6ejr 1 i5mk1+z * coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its kinetic energy?

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 60-kg skier starts from rest from h *9:nt/pnwx iq,hv8othe top of a 50-m high slope. If the work done by friction is8:wvt* q9, n /oinpxhh $-6.0 \times 10^{3} \; J$, 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 ,2 .q lbvx m:w:k os0/bxm9h,.akrq-gvita a8 rises 2.0 m. It requires 3200 J of work aikm ,/0rq:8h2aq 9xtvl.xmwkbo sbag , -v.:to get 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 a4 qu p+-8ozdwkbove horizontal. The coefficient of kinetic friction between the masw k8qzdpo4u+-s 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 swz ng s-dt +c: /82s3rb0lptljtrikes the ground with a velocity of 7.00 m/s. What average force of air friction acts on it as it falls? j 3 8 0gt+ltlsrzd-c/pb2ns:w

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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 +uaks05x) 1vunuds*nwhen he runs up a flight of stairs 10.0-m suun5k)nua1dsv 0+ x*high, in
8.00 s?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-N force is needed to move an objd,67l hg9s3.tuzfydiv t8p m -ect with a constant velocity of 5.0 m/s. What power must be delivered to the object by the fis.,fd tmgl 9 - z3yp7dtv8u6horce?

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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 that runs f o-nyq3dkyzwe53n n0.d5m (nc or 1.0 hr? (1 hpynn3w3 dn(e05 . d5qky -ozmcn = 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 fornp8v8 y;i i.b 75 bksht6e8ixvce does her foot push with when she is traveling av5bikenvi8y;s .h i7x8bp6 t8 t 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 iz9.+nfcrpi ))tn vmds4(mxc ) n 7.0 s. What is the average power delivered by thecn.t) dpm fisz)v(n xm)+r9 c4 engine? (1 hp = 746 W)

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