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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 SI uni5tml bg0w)id0ts?

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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 s3, sp8f9kwmb u5musm .ystem 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 hm d/dscy ua4+-ard against a stationary brick wall, the amount of work yous4 cma-yd/+du 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 ant7-jos2 :,s )bxrehfpy 2+qi- hzxyq+d is being held there. How much work is being done in holding the box )xhbe 72o2 j-r f,z:sqpi+xyt h+sq y-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 velocity carrying a 10-N qlfb-i ztuv3(a6q j0-;1p/s: mlkrpx object, the amount oflpzf-3q6:rq(ukmiv b/ l0ja1xts;- p 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 thp ++1 b yvdaacb)a.m.cen returned to its original position. If the total weight is 30 N, how much work wa. am+ya)+ p.1dc cvbabs 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 wzxtl+x g q)3gw n,;q*hh4wj9;xv(x gthe 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 sign of the work )jwsts)z++2zys o ,ua done by gravity while the ball goes up with the sign of sty)o +2+u s,zwz) sajthe 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 Fonpz f e* *c4fmu+k4yy1rce versus position (F vs. x) graph, representsnkyfzf e+4 *mp c*41yu

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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 versuyv2q 3khny .rk x,rohyw 2;17ts position (F vs. x), what represents the work done by the vh7kyqk.;w,2 2h r3t 1ryoxyn 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 objecu8;qipnywjoq ys,8 +6vf - 4tnv)r jb:76rjtn t'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 object's k6mprqrb-m5 -p inetic 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 ze,2by 1rqw4qw1y d u+baro, 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 muchtfhq 5f)9mc l1:;.a2y m,vwwnt4 bfwh as a car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy compared to that of tnfba9h 4l.c1,5vwh qw2 ;:fmtfwtym )he car?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Car J moves twice as fast as car K, and car J has half the mass of car K. T7;qdliwj o8xxd0*h (ml9 pin/he kinetic energy of car J,w8 d(/0;79*x plilodqh xnimj 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 wx6 rxpu7j1azy f9d8t v93bjtw4r.yd 1ith half of its original speed. What is the ratio of the final kinetic energy to the initial kinetic energ . 7wur8 y1dyj3199 46p atxxfzjdvrtby?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A brick is moving at a speed of 3 m/s and a pebble is mo(*lw2qwfycaf+ ug/13d(04rwtvh hyy ving at a speed of 5 m/s. If both objects wwfy+( t*yh2ly qd( uv1a4ghw 0/rf3chave 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/sj6vd/m,(to3 u(q mfo m 9plv2c. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant b( f3olqdmvmj (u2c9p/,omt6vraking 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 a cer 3z0kf; deis5-rdjk0ytain distance on a straight, level road. If you had been trav isedk0 jrz3-0y; dfk5eling 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 elliptical orbit. Negle q 3qsslvn8e i/j2efs 2q),an+cting any friction effects, what happens t)ja,2 /2+qs8qens3 seinfl vqo 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 principlyog,c;b aef7vhn3.i 1e.
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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 potenti0;mvh6zis:a *tpv8 tl53l 1ggflzs 4zal 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 abo c,jso4nzfz+(5 r wwtwhtk*:, ve the ground. A second object with four times the mass of tw+ *, wcrj whofzzk(s54t:t n,he first if released from the same height. The potential energy of the second object compared to the first is

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 0.200-kg mass attached to the end of a spring causes it to stretch 5.0 cm. Ifd33ewt,jkoj 6zt 3di)eg sp g4s+q +m5 another 0.200-igtog3353j pq6dmzst +)e+ ej ws4 d,kkg mass 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 e27jjt v9:0 m:sd8o ddp f(wifonergy 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 treeg:n 9cwt r9ce/:k3u e(ac s bc7cvp0)t. Compare its kinetic energy K, to its potential energ r:vtc0w9n79u /c(:cc b3cgtep)se k ay 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 drivi/syv8hz// vndng 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 f2def-7kjc0u v+8q ysalong a level frictionless surface. They both slide up the same frictionless hill. Which rises toyf-sf8 qd+vcke7 u2j0 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 a:hq ba+1.jwk$m_{1}$ 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 ltoc+xz ;2,ammechanical energy for conservative forces.tc;lxmoza+ 2,
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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 ar7wa v sspli;a.g .-,the air (air friction is present), to the ground below. How does the -glar;7vs.aiw .s,p akinetic 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 4 fqal(az)da-energy. Do not ignore air resistaaaz(d) af4q-lnce. 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 of ivyib:9 (zt+q 4 rxjy,gravitational potential energy. Do not ignore air resistance. How much kinetic energy did the ball q zyy4+:itr xvb,9(jigain?

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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 energy. zjy7/spl+q7xd7 shk8 kcl: v;
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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 issj8 jw5d/fhj- )mzv3u

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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 expres hzm vq-lyyr(x :*lh/ v57k-srsed 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 x/+bz *sq0ouavj d4pzw ;y)gz (v06n iof 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 time. To do sb)p: bdoxo4c5p9lx y5o, your powe5 oo 4ypp 9:bxlb)c5xdr 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, the car's engine mustt+ v 2-zqb:axa

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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 xd )bh-q/8 qwhN, how mqxh )8wb-h/d quch work was done in lifting it?

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You lift a 10-N physics book up in the air a distance of 1.0 m, k459z u1bjavfupl:1e/j 3 dyvat a constant velocity of 0.50 m/s. What is ydzvaj 5 ulv jf/ :91b4kep13uthe 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 dbo7c*f 8 hq t:33htpjgistance of 50.0 m. What is the work done by the 5500 h3:tcbpjfq h* 78og3tN 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 5500 N for a dis 7og2q.mhh+ bktance of 50.0 m. What is the work done by the weight of the elevatom7 kq.+bh gho2r?

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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 pj/u5ouf8j* exf838h npt)h z upward with a constant force of 5500 N for a distance of 50.0 m. Whj npft)h* p8 e8huzfxoju8 3/5at 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 d +xalremn;02along 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 down a ycu55aqzwj1ya:( vgn/w du 6kd.:ot4 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 lit0k-f7 yp gqq3(r ,j/ gxb6ilkitle sister Sarah in a sled on an icy surface (assume no friction), with a force of 60.0 N at an angle 0b3,qf glk/ ig-j 6 7yprqik(xof $37^{\circ}$ 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 forc8t9 eawrd9mku o*:s/ ke. The graph in Fig. 6-1 shows the fow8om9r:*u9k tskd/e arce 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 dqpmtp7 - k1sz4irection of the force. The graph in Fig. 6-1 shows the fo pks 1ptq4-7mzrce versus the object's position. Find the work done when the object moves from 2.0 to 4.0 m.


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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the dirxxr5eb -c0: mhection of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work doh-0e mb: xr5cxne 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 graph in Fig.*4y pob 4ezol* 6-1 shows the force versus the object's position. Find the work done when the object moves froeb4* zyopo l*4m 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 rmvm2: i;uxg)(initially at rest) across a 10 m level surface. What is the final kinetic enemg :)um2 xrv;irgy 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 appli yyf x.xdem44lt2h4bl75si 3med to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final speedll7244yy3mx5sbm.d x etfi4h 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 ql9a7jz7y;fybiivis 3a t- -8 with a speed of 5.0 m/s. How much work is required to stop th8s yi -3zj;9i-qlfbyti7v a7ae 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/s, wht kaiy zrw0-a57 n*gd5at distance is required to stop ai50dr z- n7tg5*aywka car moving at 50 m/s under the same condition?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring-driven dart gun propels a 103r unst+46g/p4mvu- fuh3et0dodlx ;-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 negligible muph 4n u/3 3-+6vetmsf dlo4dr;t0uxgass?

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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 o hs)fi5y*0+rxg9uj ma f 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 floor. What is the cart's final kinetic em59suf *xir yhj0a+g)nergy?

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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 inmj13 -qg+k/skz (anhqh2ui 953tsea eto 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 sg35k q-ai+hsu et/ qzk(2 1amhn93 jsetopping 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 fl wk 01ogi0kshv,rb-: eoor to a height of 13.0 m above the floor. What ie0r,1hw v0gk b: iosk-s the 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 inclined plane. The plane is zl- 9od tj*avg:k6,fh4.0 m long and rises 2.0 m. If the plane is frictionless, how much work was done:6to lz*9gahk v-df,j 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 og* au;4bbf) einto a spring, causes the spring to stretch 2.0 cm. What is the spring bei* )augf4b; 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 constc/9pnu7b*ro ac9 -ga9 m/zecf ant of 60 N/m. How much potential energy does it storeuon-a/ efz7cab99gcp9c/r*m , 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 spring with ctpjxe;olm;;i.0u d ,a spring constant of 25 c e ,tx;ip;;j0.dloum N/m by 10 cm.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What work is required to stretch a spring oft+idug6d k0d1 spring constant 40 N/m from x = 0.20 m to 0.25 m? 1+u6i k0ddtdg(Assume the unstretched position is at x = 0.)

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring with a spring con)te4y k)blol)5qh yw( ae)v w3stant of 15 N/m is initially compressed by 3.0 cm. How much work is required to compress the spring an additionao)e4bh)w)te kv5lly q) 3(a ywl 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 hig.iy- 1s+kerk rh slope. What is the speed of the slier on +e k1isryr.-kreaching 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 ofs:lx 19 qqu6b9nuxw :if the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fastxu9n:lx:1 qqsb iw96u will she be moving after dropping 10 m in elevation?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object slides down a frictionless inclined plane. At the bottom,8do*.e ,j0s:aj1o rh40 nnh0 epzpfcl it has a speed of 9.80 m/s. What is th4. hepf10njos008p jnah e:,z*dco lre 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 aylqrhys-- -8aj ;/px ik 4fz5is 0.70 m above the floor, its potentiiq -;yh z/sxa5jkap4-lyrf8- al energy 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, kpj:yr i6)gn px24+jcblasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 14jn)jr+pkigxy: 26 c p40 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 Jinjjv/ ljpejjv :9,57-skvw4 . At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relatjn,97v5jjvvi4e: kws jj p/-live to its launch point, did it rise?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts from rest at a point 45 m above the bottom of a ye str7fgzp-8sz;i 6- 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 they8t6gz s7 sipz-e-r;f 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 ssq25r lnxd3 gl a2*0jrpeed of 5.0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above ra s2 l2j0 dg*nxlq5r3the 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 atc 6y)j j+ 1m0juptpb 6ri7m+pp a 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 coaste)0j6t p+jjypr ip1+bmuc 6 7pmr 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 f vr n2ini+p6f79le.lball 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 pendulum of length 50 cm is pulled 30 cm awapjwgc/ i lwgd1:g+ zqfh g,u93 5j,u.oy from the vertical axis and released from rest. What will be its speed at the bottom of its swiu +1i:.g 3j,9jwdo/5ugzlggwp, fh qcng?

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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 uncomprez+ bqc/yfg,*z ssed horizontal spring with spring constan,q zzcyg*+ bf/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 d9tr0tcwe+ yq9own her 2000 kg car to stop for a red light. What work is done by the friction force agw9+tc qe y0rt9ainst 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 object and a horizontal surfar)6(5bjv 5iiz4mbbe sce is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance wreibbjmz)6bi s 545 (vill it slide before coming to a stop?

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 12-kg object is moving on a rough, level surface. It has 24 n a *kloye2nd( nu i pf(25,ze) qfju*vq*-cw7J of kinetic energy. The c*ep2uinfulfy-k7wz* *5n(od v,q)2(ja eq nfriction 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 applied horizontally to a 2.0-kg mass on a 8z l :fco.tib .:dvlnc88kz /lmwk/4jlevel surface. The coefficient of kinetic frictjl t/mzfci l8 4c8w:vzk.o8d .b:/lnkion 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 50-m high slopz(+ogszb t 3r-e. If the work done by fri+ob (zts3zrg- ction 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 pushekmrx c)q 15hl:hfjae ;9n5t,yd up an inclined plane. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box to the top of tfj qnx1hh59er,kly5):acmt ;he 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 ato( qc /h0bh3x d, v8py2fofzp3 the top of a plane inclined 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 slidi8hfpx/3 y,2 ocbf 3h(dvqpz0ong 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:(fm0bb3 7nktf9 pzqt .0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts on it as itk9t m(fb qt7z 0fbn3p: 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, jr lkldhp1;:.0-kg boy using energy when he runs up a flight of stairs 10.0-l l,rjhdpk: 1;m 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 object with a conu5c.mgk vdc -bu.j:v a1x)2l.h tjs.xve q86zstant velocity of 5.0 m/s. What pov .1vh cb.6sxu-dlvz8jeux2q m.:5c.t )jakg wer 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 ener(+,;z+, e yuqk -yuvgz)i tzl:af-yff gy are used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = uz+eq,zf,)a zy-v(tyl:yi;k -ugff+ 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*v6f kto.1jlswa 8t5b5-gn mz riding. How much force does her foot push with when she is 5m .-s 1 bz8oatfjk5lgnv*wt6traveling at 8.0 m/s?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. What is the average po)ob m4je egq36wer delivered by the enbqeo )4m3j6 eggine? (1 hp = 746 W)

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