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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 expressnznd.jr4w,a 6u dtn( 4ed 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 there is jp;ag(qy k9p4 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 bri.1lm,n h2tghxy(t6:x ,;vtouj 6t egzck wall, the amount of work you do6(,mxtujt:z6hno ttyv2g .el1hg; x,

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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 beiw-gwe1+ z)c9l0 j e*gok*qa l)m,y ec3h r-chdng held there. How much work is being done in holding the box in this )jma e*ew)kco,hhl3*c +9 dwz eg-10-qlygcr 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 velocity carryincj;5.8 lqkl1gixl a2nzquq 6.g a 10-N object, the amoun5 u8 za .l6ql. q;qxjngklci21t of work you do is

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A container of water is lifted vertically 3.0 m then returned to its origin.c/s0hvd sev05dp;b jal position. If the total weight is 30 N, how much bp.0cs;ve5 sd0djv/ hwork 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 :8,0yuzv jpg swork 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. Compar6s.0:d j bxtlqe the sign of the work done by gravity while the ball goes up t dlsb.:q 6jx0with 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 (w/ 0ws,7el7xx byb.vlF vs. x) graph, representswlsx vbweb 7,07 .yxl/

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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 repre+ndw58z u 1ippy t-8owsents the work done by the for+pnw8i8yt5- zp1o wduce 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 o4)kb(mef z)ga bject's kinetic energy

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the net work done on an object is negative, then the ob 6-jh -inl6lrfject'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 oj i.r;tx08-nu9bxbe e bject 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 at07g ramf6k a-.hfx hy1xc 2hm/z4c .fe twice the speed of the car. Which statement is true about the truc6 hmf/c a0xrfg-4hxzc 1ykh ..ae7 2fmk'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 thejz45 q v9x xgzh5sq-+d mass of car K. The kinetic energy ovz xd-h+gsj55q9zq4x f 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 ort v+6.6oe,dh+vd obk weux)gma)7b1liginal speed. What is the ratio of the fin)1le+.,6+ vedvbxuhwo dg7b)o 6k matal 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;(5hva5 snp)py r(v at speed of 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 ratiosv5n)p ;yah(5tp v(ra 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 moving9quke91/vy47dlel 5jd5g0 t8t,y.islqa vkp with speed 2.0 m/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 distance before stoy5g7lydq5,eqklu1v 9 90vsjpid 8t /let . k4apping?

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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 hjx s xz9(y1 (it:em0hpanic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the ca: t xhyiezhm(1 0xj9(sr 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 elliptical orbi1v;+b uw+8*x msbbf : vnsx6sjm3gw/ tt. Neglecting any friction effects, what happens to the planet' jwvm ns+ tm+vbxs:6fgbx;83*1wusb/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 principlecahn lo 0gyh7 h6f+i8*.
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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 ,auou*;z1of m negative 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 gri ,qv i570pf7+0ipvrk flgs )cound. A second object with four times the mass of the first if released from the same height. The potential energy of the second object compari, 0vrisf)f kcq0v75p lp7+g ied 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 so5 x*e+i;jbv xpring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential ej*+;b 5xieox vnergy 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 enez z,0/) ptxudhrgy 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 itxq8vlxd( ( ix8 recc57c:l *bes potential energlb *exixe8 x crqvd(cc7l :58(y 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 j/uvw4(qw c: a v2:hmn6d3bhoup 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 ver;nmvpsj do)d ixr78*.y heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to a greatd 7i8j.xpos dnm)v;r*er 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 0r)qid*m.e idp -k*s a$m_{1}$ 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 fo- )nr0c y* 0kuczsz dz1*jthj+r conservative forces.z 0d unzsk*cc+j*z )0t1 hjr-y
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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, througkq6si7 t 3 mtl1an*h;ch the air (air friction is present), to the ground below. How does the kineti7htk;c am is31n6q*ltc 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 distance and gains 30 J of kinetic enwe- ed a;. giw/9ah6pmergy. Do not ignore air .i ea h6 e-9/pwmdga;wresistance. How much 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 oa958ytangh7hj;g z2/o ,hjs of gravitational potential energy. Do not ignore air resistance. How mu9h5;j noa7zahgso ,y h 8tgj2/ch 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 conservationfnlnc *ochs ;;d8i6c4etsau/n 7+; vc 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 isxd)s39 idxk)q

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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 unianh7a86vqfyw ;v2zf / ts?

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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 nc(s/jf k wp,gglj,h/ps 00u5cot 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 ou+jkpc.w8 gciq b /*r*ne-third the time. To do so, your power output must have bi bcujc*+g ./wqpr* 8keen

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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 cap0:+g 9viqkdy7v c b6ar'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 weigh98 k97jfc)8ucpifo0f i*iq w28 jgophs 90 N, how much work was done in lifting hw jip f8f79k ocf0)8u8q*oig29pjic 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 airp(pu, 2)h avp,t;giwv a distance of 1.0 m, at a constant velocity oapphiv),v ;pw2ug,t (f 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 wit ,suu94jnm+fq t8mzk)h a constant force of 5500 N for a distanc+fj9msq kntu,m z8) 4ue of 50.0 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 bfuf2g ::g7xd a constant force of 5500 N for a distance of 50.0 m. What is :g: xffg dub27the 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 pullv qxp 7ud;kzh5xi2p) 3 ,;nqbked upward with a constant force of 5500 N for a distance of 50.0 m. What is the net pq qd);k,bhzp2 ;7 x5kxnui3vwork 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 dg2wce49y/z1 t lz7umup 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 slides 8.0 m doao/* 0z ni pd)m)w7igywn 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 surfaae,uzefcrg vm:9dr:sw4 m72:ce (assume no fric927rrce mfa:vzmgu,d: 4 wes:tion), 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 force. The grl xdx aduop n9md534,b;os1o:aph in Fig. 6-1 shows the force versus the objec oxd3a s9xpd:5do l4m;u ,1nobt'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 graph in Fig. 6;tw hjs 3fv/a9;vfy6i-1 shows the force versus the object's position. Find the work done when the hviv3f y;j af ;9t/w6sobject 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 dire j.5(etw y(nltp2zwg:ction of the force. The graph in Fig. 6-1 shows the force versus the object's :5 t nw.zgw(ljyte2p(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 forcezimxyfg . 20pl45j2di. 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 6.f2y 2i5p 0xgidmlzj4.0 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 Ny)89xlrzl8kys nnlb-:;dizp 0+la 9t is applied to move a 55-kg cart (initially at rest) across a 10 m lel -nzl:8;9bay)txyd0s n8i kl 9rzl+pvel surface. What 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 applied3z lrkj/-t+be to move a 55-kg cart (initially at rest) across a 13-ztklbrje / +0 m level surface. What is the final speed of the cart?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-kg mass is moving with a speed of 5.0 m/s. How much work is rr381+yle+ yxz thu9zz5 d+7jw syw5d3wml:l aequired to stop the masu+lwz+rd9j1+s7m lzwl35ty3y :hx 5 e8ya zwds?

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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/s, what distan -;tecf p4o7r.eokm*w ce is required to stop a car moving at 50 4oe.o* c ;7ptmr-wef km/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 10lhzui2+2(ec +v ;hj ch-g dart. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With wh;z ++h2lcihecuh v(2j at 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 hfit8oo3rb c(mw9k*b 4gj3s)lorizontal component of 80 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless (9mb cjo*wof r3i83k b gst4l)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 hayl-q1o7rlm z xz bi:3t h.1qlu8, striking the hay with a velocity of 60 m/s. It penetratei-xo.l1mtqbluzr h7 z38l:q1 s 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 he *:r6ccmqvog +ight of 7.00 m above a floor to a height of 13.0 m above the floor. What is the change in gravitational potential energc +vgq6o mr*:cy?

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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.f:xsc(p n3+ hfj u8 tuq793wfj The plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much ws3j7+qfxpf wt9 hnc8uuf:3j ( ork 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 spri:t* b/wgnbtf1 ng to stretch 2.0 cm. What is the spring cnftwg:*1bbt / onstant?

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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 sprin(c n ihs5f 5cjbdz/3z8g constant of 60 N/m. How much potential energy does it storcn hf8czz s3ib(dj/55e, 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 rz2i *5qzj jqq:6rqbv0une8zjw:q/,sed spring with a spring constant of 25 N/m by 1wq,8qrzb2zz6:n /jr qvq:ju5ei* q j 00 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 s1xa2sj cw6 p,zw/i5ljtretch a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched position is wpjac6l w5jxz i2s, 1/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 Nb,b b+ryh23ryped3 x22)v roi/m is initially compressed by 3.0 cm. How much work is required to compress the spring an additionh3r boiy vpe +2)bx,2rb2ydr 3al 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: 6l uvpev1g(j a 50-m high slope. What is the speed of thep6v u(vlg j1:e slier on reaching the bottom of the slope? (Neglect friction.)

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A skier, of mass 40 kg, pushes off the top of a hill with an initial sp.kidq)mk;tf *eed of 4.0 m/s. Neglecting . )dkkm;t*q fifriction, how 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 inclivekf1/k2 znv 2qkwk83ned plane. At the bottom, it has a speed of 9.80 m/s. What is the vertz3 /2q8kkw1nvv fkk2 eical 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 fnhh*obe 0d 7j2ki 9+npv 7jyj9y4 0dvbloor, its potential energne d7j0yv+ i h9 kjhb7pydv*9o2nbj04y 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, weighig, l ;e nwxgb;:+-osqyndj,l2ng 10 N, blasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its traj+w,-2ey d, ;lsjolxg nq;bgn: ectory, 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 kinetyy1m9+iu6 xd i)amm6sied7- m/w rm b.ic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its la -6dmeaxm7ym. u /b9r)i6msmdi w i+y1unch point, did it rise?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts from rest at a point 45 m above t4jvg(nta:4z.b3fq bhf( x.h zhe 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 slopefa4.b:t qh3 b4(vx.(zfnjhzg, 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 botr2ns9 6ywzs l9tom 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 2ys9l 6snrz 9wbottom 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 abobe q;:1wzof 5gg g06dbve 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 the top of the next slope, whicoqb;fdb5g:gg 01 6zweh is 45 m above the bottom of the dip?


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78#
 
  What is the minimum speed of the ball at the bot,+a7h em fu-hrtom of its swing (point

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

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80#
 
  难度:2

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pendulum of length 50 cm iscjao k t/8ll*ir8 r(1o pulled 30 cm away from the vertical axis and released from rest. What will be its speed at the bott(ja8ci1 8llor * or/ktom 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 pec5i .,*8gxrcamvj 025 m/s hits an initially uncompressed horizontal spring with spring con.e05a,g i8r cp*xcvjmstant 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 f:nej70c)gx o7 zp5yd 8c xu4ecar to stop for a red light. What work is done y0g8jfez c)57d: c upxoe 47xnby 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-kg ob-zygt+s4as8j 3g co4ky (+mfpject and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will yajgs cpf ytm4(+- +sg3k8oz 4it 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 rough99b/ sjzbazbv(s pm +;j,s ii,, level surface. It has 24 J of kinetic energy. The fr(j+sz,jb9 v zm,a/i; s9ibp bsiction force 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 applieyopit0:e/;0k v +po rdga -8k s.ipm:xd horizontally to a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass. :kp8xi0po o-:sp+t/rivme d;0kgay 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 50-m high slope. If the work a16a:w6,c)a ,5orv ra;umd,ucx vacj done by fridcarxv1awv5: ,a6m)oj ur6aau c , ,;cction 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 andq 3pyh7,z*vj/vl0 x yh rises 2.0 m. It requires 32007xpyz, / v0jhv y3hql* J of work 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 teu2gx4y w s:3o8) gr 9nzqer0from rest at the top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plan92 uw3e8s xgzq r eo4y0gtn:r)e 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 fra hhebp d.0s)( uz8erpm6.7y com a height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What 7 h(aprycpzse)8.ed.0 buh m6 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 pbftl s8; 2(xewhen he runs up a flight of stairs 10.0-m high2petfsxl;8(b , 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 object with a constant vels,(/4t zods icocity of 5.0 m/s. What power must be delivered to the objectd /,s4(c oitzs 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 that runs for 1.0 hr? ()yl r*sv;b wg-1 hp = 74 ;r*gblyv-)w s6 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(ox7;-a79bwztb hgns of 500 W while riding. How much force does her foot push with when she is traveling at 8.0 m/sb-a9 n7xzbo(h t s7;wg?

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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 o0 0dxntvw( vl*tz+)qgs79w x 7.0 s. What is the average power delivered by the engine? (1 hp 9v*q7+0w ( xd0nzvts twl)xog = 746 W)

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