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习题练习：Physics Unit6: Work and Energy
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 作者: physics  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 unns, 3au*lcy3qwv u-6jits?

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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 therz-8 qsmk27u6wl6 l.coz j1ecpe is no motion?

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you push twice as hard against a stationary brickerjw wzwwhi0( 1iz9/; wall, the amount of work you (;ew1wi zh 9/iwzrjw0do

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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 d /kh)xbe;hnmv(/5m ebeing held there. How much work is being done inehkhd x/be/(mvn); m5 holding 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 velocity carrying ao,d6 4woauc6j 10-N object, the aa6oow6,4 c dujmount 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 v7a.y oz 5tww/v3 yij.certically 3.0 m then returned to its original position. If the total weight is 30 N, how much w7.o./z5wwy a3tj vci york 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 xv5v ya5*fcevf kj3g(ksx5;6on 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. Compazjck ezuj,5 s9/;/hq (aowfb3re the sign of the work done by gravity while the baluj/ a(qzh;/9be jk ,szoc5wf3l goes up with 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 (F vsr sm-xm/ 0lxw7. x) graph, representsmwms x/0x7lr -

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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.:uh l25mj- z;;kobe km x), what represents the work done by th;me2mkub-j kol5:z h;e 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's 0e mvp +bcc;pp97wr u;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 onymigm4k+chc/7 2f+k d h9z l9t 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 object is ze8lq5+vrjnia;fiu:p.nxb , - fro, 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 )9i8ck lulx,imdr x (usc*k0ou052d c car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic energy comparedl0iudm5 di)s8 clxr,c90u(2x* kku oc 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, )j 0z/ssods.dno- rn)and car J has half the mass of car K. The kinetic energy of car J, compared ds)ds ojo).n-/0nzrsto 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 botl3 :xx.9z4qmt :zmltunces back with half of its original speed. What is the ratio of the finalzmxlt 4:ztl.mt9:3xq 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/s and wm ( k5t0*xs0ejs8gjhsmn:9 va 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 the rock's msnwj stx m :ve95*mjgh0ks8(0ass?

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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. ;1 - wbqdrqcpn2stn( 9 m)tvp;26ouno0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constptu d-9qrp m(2 c;o o1wnnn;62qbt)sv ant 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 u. c.o+b s+t;msphn8myour car in a panic, and skid a certain distance on a straight, level road. If yo8.np+m c bsh; +s.motuu 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 orbixmy vr54u: dn*ts the Sun in an elliptical orbit. Neglecting any friction effects, what happensyunmxd r:*5v 4 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 q cyez4brr1gz(g3 (f8 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 ao opuv;areyp 5 )/r/)e system to have 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 ground. A bij)sb 3l4qnu:1 /y jksecond object with foukujl1s3)binqb y:/ 4j r times the mass of the 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 sd64-m:tyickz tretch 5.0 cm. If another 0.200-kg mass is added to the spring-md4kzi6 ytc:, 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 of a so sjq*.ek 9:sw /ags-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 i bqyvr2.*b b;-o ry4cjts kinetic energy K, to its potential energy U.*y -y.bq b2voc4;rj br

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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 utuuu p3j.gadsv(di x* 0 ;f 9s fs74o08a6coqvp 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 sg:h/*lvivsnllvro5j y 57 rsn58 h2d;peeds along a level frictionless surface. They both slide up the same frictionless hill. Which risod l55lh: *gs v7s;nyr5vi n l8vhr/2jes 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 39t bjfx.top 5z4.e zd$m_{1}$ 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 onxdo4qive pt4 0;6eh4o m)-yjf mechanical energy for conservative forcesd 0 eo4th46m4y;p-e xiojqvn).
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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, through5 o41oqdu x)mx.fraz0 the air (air friction is present), to the ground below. How does the kineoo)xx. 14rzuf50 aqmdtic 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 kin:+mn0t *teatc etic energy. Do not ignore air resistance. How much gravitational potenttm *0ea c+tnt:ial 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 gravitmce; r75 7 k4h9 ghim.gkono+cational potential energy. Do not ignore air resistance. How much9h icg c;oem gn.h+4rkmk 7o75 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 conservdh p7hvv+3 88 vtnj*: erjd0ssation 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 is :c;qibnvu u28hy/go+

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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 7k eqe z-8 yqzyta;;t0in 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 no1u/z.mvb5b++3k 5 uoc av gxdut 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 tim96xn.svi7qw7r yx zo5t 4,l nges the work in one-third the time. To do so, your power output must have be7qzx wo,.l59g yv6x4n nti sr7en

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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 constan6a7lsu(km;(( j* k yxflb6iojt acceleration, 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 y,sm1js. i37 tx.e9 iduxs8un m and held there. If the object weighs 90 N, how much , e3ut.mdyj8u1 i siss.xn9x7 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 +y-nt.l7g vbmair a distance of 1.0 m, at a constant velgbt7vl. -+ymn ocity 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 pulle(jur(-12 /h rmww edxld upward with a constant force of 5500 N for a distance of 50.0 m. What is the work done by the 5((d l whumjx r-e2r1w/500 N force?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled upward with a conh.s66o1oz uhkfaj -:tstant force of 5500 N for a distance of 50.0 m. What is the wz:.tsokhuj1h66 - fao ork 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(oo4k eamt6(w N for a distance of 50.0 m. What is theoawt (mo(e k46 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 6.07q)rd9bpdi,i3gk g 2m9bg a /y m up 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 down a reqaofqc) )i. .amp, 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 sistegr( e21 arwni(igz0q yh59p1or Sarah in a sled on an icy surface (assume no friction), wr2 o 051y(ei ip9(1 wrzaqghgnith 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.st lx 4 z.ydgfh(h78c4g3 nz.j The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 0 to8ht4yh 4(lc 73.f gxngs.zz jd 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 gra;u,zhm8lydjz aw *- (jph in Fig. 6-1 shows the force versus the objectd* ;(-8 yzu ljaw,zhmj's position. Find the work done when the object moves from 2.0 to 4.0 m.


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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the force. The graph in f ypd1 1(ij48nki,k wbFig. 6-1 shows the force versus the object's position. Find the 4kj1 npd( i,ib f81ywkwork 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 i ,jbk 1a1rk3 :f3cgluhn the direction of the force. The graph in Fig. 6-1 shows the fh rkb13l3ugf:aj1k ,corce versus 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 z 8cnw f8(amvm koc* iob28n)1to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final kcz 8nfk8(m) *8 ic2nv1wbm oaoinetic 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 wn y. wgkowt .a4v(3a4cart (initially at rest) wg n(.ky4at.a3 wv4 owacross a 10 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 ifg(/ r3m x z5 awf7d py2a)nn1rkt.y/qn(c9nls required to stop thenkznt/ ((2na dycpq5a mwr 3.f/ )17f9xy grln 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 movid24( mwugcfaz*2 b fg5ng at 25 m/s, what distance is required2z gu2m fd5gf(wb4a*c to stop a car moving at 50 m/s under the same condition?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring-driven dart gu j-*.y*bi hgssa4 t7nen 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 neglig 4-tsbhni sy7jeg* *a.ible 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 verphb 6f(b+0: mis-wfaqh+ g;fwtical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m hw; m+ f0wg6iqp sfh-b(:hfa+borizontally 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 v u .5w45aril (irr yi uk7h hsinwv-+.p:hp;9into 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 iaikh+5r wypp v. :nsh9i4iu7- uh5;v.wlr(r 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 q8wzdr1q dzi6z y+4-p height of 7.00 m above a floor to a height of 13.0 m above the floor. q q14pd+8dy 6zwrz-iz What is 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,pes5hnc k8z5) .gd nlbj-qc0+ rw:md 5m;v xu plane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how muc5,ng 5erqb. wdkzxnu0 -:ps mljc)5 +8vdmh ;ch 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 thugm73 mfcf6+ae spring to stretch 2.0 cm. What is the spring constagmm3fu + cf6a7nt?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring is characterized by a spring constant of 60 N/m. How much poten8i:it 1c5dpkuno 29rf tial energy does it storedi 9cu t1i f:2kon5pr8, 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 unco;7ma4 xi3 ft uye5wnnnq4xt4)mpressed spring with a spring constant of 25 N/m by 10 ce4nawnu t7m3yxt4n )ifxq ;54m.

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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 of spring constant 40 N/m from x =(ngq8w w*e2q q 0.20 m to 0.25 m? (Assume the unstretched position is atww* en(q2qq8g 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 0k/zqxo)fmu +ao8 t139gf yg zconstant of 15 N/m is initially compressed by 3.0 cm. How much work is req3 yq9 m1/g kx 8zgfu0oz+a)tofuired to compress the spring 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 startsyxn9 3kg,wtt3s6;tzc from rest from the top of a 50-m high slope. What is the speed of the slier on reaching the bottom of the slope? (Negl g33t tswc;x9zk,ynt6ect 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 wiq33y-w ue v6ltth an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving a-l3qewtv y 6u3fter 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 loet2i z4t/p4 bottom, it has a speed of 9.80 m/s. What is the vertical height ot4z lp4i/o2etf 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 t*)v(sydx+jq6*9 ywvdggg x 7e he floor. When it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How fast is it movxg6dg vx e)7v g+**wq y(sy9djing?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A toy rocket, weighing 10 N, blasts straight up from ground level with2 v1w8xff73 raf3hw7bz *qpr h a kinetic energy of 40 J. At the exact top of ih bazw*3 hqvx rf1372pr78ffwts 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 groun3g7x (kmv3 bdwd with a kinetic energy of 220 J. At the highest po337dkx(m bwg vint in its trajectory, its kinetic energy is 120 J. To what 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 from rest at a point 45 m above the b-de*6 njc5- a bdkf/xjottom of a dip (See Fig. 6-2). Negdkba/ jcn-65edfxj*- lect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?


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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts with a speed of 5.0 m/s at a point 4rvd4.hb74n 2e 9m*hx ixm2.txwewvj6 5 m above the bottom of a dip (Seewr.6evb xh2vhei4j4 w9xmm 2* ntx.7d 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 a vpv eplr06 h8 89y.twbspeed of 25 m/s (See Fig. 6-2tv6p p.whebr8l 8y 09v). Neglect friction, what will be the speed 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 t:nz (9q9i.n rudfhby:he 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 away from the vertical axi a,w-rgs s6ho*+f0gwu s and released from rest. What will be its speed at the bott u+hgrfs- as*6wo ,0gwom 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 uncompressed horizo e:xr5 ad;j6bw/lwe; untal spring with s:; bx elrw/;uew5d 6ajpring 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 y;cfaipn9w 38 stop for a red light. What work is don9;pyi 3cnafw 8e by the friction force against the wheels?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The kinetic friction force between a 60.0-kg object and a horizontal surface is u 5ck m, e(w h j1t3bajdwgo5-xb20n)k50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide before c5 btkje)ag-wxmh,o( 032cbn15djkuw oming 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 enertjb0bv mc59 (rgy. The friction force on it is a constant 0.50 N. 9j (vbcmr5t0b 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 le ibugx43di::7js* 8,jpx cwag/kr.nv vel surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 13spjd agw x uc/v,j n g*i:.8xb47ri:k0 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 d al7u 5k-sr a4nxm/wq3onq- ar3lx/aw7suk5 nm4e by friction 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 lon,a:rm(ovm9 yjg and rises 2.0 m. It requires 3200 J of work to get the box to the top of the plane. What was the magnitude of the a ,9o ymv(:mjarverage 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 ax* : )c;ups,ae hamvl0bove horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be thmlxas: h u a0cp,*);eve 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 19* l,a8mydzwa x q4c+q3pg8v k0.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts on qc l4a+*9vyxk,d gamw8 zpq83it 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 whe6h)maed)* e j5q8d 3s jzl 1*8bthldtmn he runs up a flight of stairs 10.0-m high*15e8h3mj* mdzl8 t) daetqbl 6j) hds, 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 f+vo6 fbwzm6(etz7 w9 move an object with a constant velocity of 5.0 m/s. What power must be delivered to zv6o tbwf(+9 z7f6mwe 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 e9d)/umwvdt 0e s bz,1rnergy are used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 ,wbz9u )em0/1tdrvs dW)

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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. opx7r 5wuyvct)7wh7mn 1q*-s How much force does her foot push with * puv-7h7tq n)mcy r1wsx5wo7 when she 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. What is the akvuf r)/:un(w verage power delivered by the engine? (1 hpwnv u(k/ )f:ru = 746 W)

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