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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 worvs stiuf* b3 uv :*okr,v*qf4,k 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 system if there is no motio3 vg,p5e0kf2cn- bqbvn?

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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 brick wall, thghph ( 9.frd wlo7ut 8f7d)8gwe amount of work yo8g7 rtoh.du78dlgf p9) wh(w fu 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 vertically9+xvmb; m spf5qia tvihk *1o e+ex-*5 and is being held there. How much work is being done in holding the box in thii bk svhm+9fp;xot+q5 x* m5eaev1i-*s 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 c hd ken2 g;im jw0 z0j3+q))+.griahslarrying a 10-N objeces.qd2nhlrj i g;)k +300g iaw)z+jmht, the amount 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 lift dim3f v 4:qkre(s:t1 k3fc)nbed vertically 3.0 m then returned to its original position. If the total weight is 30 N, h33:c: q tfsvn )kd1fk(b me4irow much work was done?

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Does the centripetal force acting on an objetophcdf d ko a35l*+6kdpc1:7 ct 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 sit dd;5-y+bil51poi v+eb k f)hgn of the work done by gravity while the ball goes up with the sign of the work done by g -155i +vobel;tfyikd pd+hb)ravity 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, represen.h; taskz30-w(mth2v5c ,. bbjcld gu ts b.al.5z stw-g hkcvd(hu c,0btm;23j

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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 representdgk .q )j3(vsss the work done by the force. )qj3 (svdkgs 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 kinetic enerc/( g)evbk 4uugy

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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 kinetic enz,+ ybqi -rl*iergy

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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'slrr/z *-cbs,/fy8rcm 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 a;0 auxjmzsjn r82s jhc(:v3 (us much as a car, and is moving at twice the speed of the car. Which statement is true about the truck's(jj csuzavn: ; 0(38rumhj2xs 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 the mass of car K. Theaj)r;kjmty 1o6 mc7v./7tf z w kinetic energy of car J, compared tj 7t t mrvwyf/1 j;7aomz.ck)6o 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 ornw42p+ym 4 i:s7nwm4ivpify ( iginal speed. What is the ratio of the myf(niypw+p s i7wmn4i2:4v4final 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 a.aivh rw+ 0mn; 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 a0rn. ;+mvih wrock'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 with5 nh(ad5 5j.3eenkug k 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 ak g 5(j355eeun kh.dndistance 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 swmk (mzky34lvl- meha2bsf 61-5vh 9a kid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the same conditio-bh3f hek9aml5s1m z 2-v4lm6waky(v ns?

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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 xp*2+ d.5aw)o(qf r ckcgjiu; orbits the Sun in an elliptical orbit. Neglecting any friction effects, what happens to th( acic2 u)x;drk p*q+gof.j5we 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 pr sv2c k)(:ia(pw6 pomeinciple.
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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 systa d r9agsj+p:yuzph8;( de,:4h9rc nv em 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 second object wit2nm 18ks,hj*da8 vh fth four times the mass of the first if released from the same height. The potential energy of the second object compared njkmtah1sf dv8,* h28to 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. mavh,gkp) w h:;nm+5pIf another 0.200-kg massp; gwk:pa5m vhnh +m,) 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 of a systeyvl5:grp 7e0v .j8bqqm

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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. Com7yna.1d e8hu d +pp bh58j1ylbpare its kinetic energy K, to its potential energy U88 n1e p+5y1.b uh bh7aldjpdy.

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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 t9e ,(4he3cswnhprm rw,9.ncup 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.bzh0a hvqk2 , sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises, zhhbkv a2q.0 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 deys6dcw4. m5$m_{1}$ 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 formb6j j7;uc/zlzf976b6-umd ;em e lrb conservative forcesuj6b /fcz-b 7bd6m6 ;r ljezu 7ml9e;m.
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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball falls from the top of a building, through the air (jhd nq 7fg -p, qt1:)g/ks,efoair friction is present), to,7 htksf)q-g1:do , /f eqpgnj 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 distance and gains 30 J of kinetic energy. Do notst2 ;q 8/wq,ezpmicu 2 ignore air resistance. How much gravitationzpq;2 ,/qwt s28cieum al 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 gravitational potential energywkl9q22 7sp eak2bf1k. Do not ignore air resistance. How much kinetic energy dw29 p27 qbkskekal1f2id 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 enebu aigat+gi86yh-v llus*g(/a j,lb -1ux /t3rgy.
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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 isdw a8ub(;)4a8i ur winpw0f5w

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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 povkz82 6c aijoro -a/lm;l v*e1wer 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 i- m4wc9aqs 0xtgidq-pcb0 5u.s not 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,t*s8mqh 3f kp3x3ct9h you did 3 times the work in one-third the time. To do so, your power 9*q t3hmhkxpscf83 t 3output 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 cb1kirn:iapt/,7 ) o0zm.sn dbar'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 objec l-lq;i1zf8jrt 1t.0hkxp1vjt weighs 90 N, how much wzkf0i; .t pv1tq18lxj hr1-ljork 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 boorrmayz*q7espr:3.;6/prn4 mwk/ y sk k up in the air a distance of 1.0 m, at a constant velocity p w/rr73y4;n6 ezs aqmrr ksk*.m /:pyof 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 conse ih7bk2w2n;hamt+ q 1tant force of 5500 N for a distance of 50.0 m. What is 12bk t27nqhah m+w;iethe 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 upwam9.o-02to;0up v:i ersbu ntnrd with a constant force of 5500 N for a distance of 50poo9t -n20rt; usei.0 b vm:un.0 m. What is the work done by the weight of the elevator?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled upward with a const knni, e..l/u:r /qqyiant force of 5500 N for a distance of 50.0 my/n.:i., l/ui eqrnq k. What 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 alonggk1wcqac.zd) 9qu j3dmnten.- x0 6: z 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 9 ec 0xnx.)mubj7xn(vramp, 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 surface (adig 9pgz) vdx k:s.n9)ssume no friction), with a force of 60.0 N at an angle o p 9gvd:sxk g)9n.id)zf $37^{\circ}$ 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 thf*r1jzz , i1cge force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object m1i gjc*1zzf,r oves 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- (+phvv 3epy5w1 shows the force versus the object's position. Findhe3w ppvvy+5 ( 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 Fig. 6-1 sh7jlw961b ;iw jol)zwpows the force versus the object's position. Find the work done when the object moves from 4.0 to w p 1z9io6b l)wj;ljw76.0 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 directiogq7:8hrup5f s0o f j k5za::ubn of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done w:f5:rzaqo8gu05u sf7 b:p hkjhen the object moves from 0 to 6.0 m.


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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force of 200 N is applied to move a 55-kg cart (initiaiy0a,bj dvz fr fo)-dt 8gi,(2lly at rest) across t8a(-oi2z,jidb0, yffd rvg) a 10 m level 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 applied to move a 55-kg cart (initially at reg8it5u uiqb: *g0pau1st) across a 10 m level surface. What is the finabqta80 u1*gi ug5pu: il 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 re)w+dpb (c/uzhj q8hv-quired to stuz/-dh bq(h )8wp+c jvop 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 initiallyquf3*5 hz7x3c6 94 jzfkgwl he moving at 25 m/s, what distance is required to stop a car moving at 50 m/s under the same co*f95zfe w6j7uqz g343hck lhxndition?

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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 10-g dart. It i+q39py jl;a qds cocked by exerting a force of ly;+9jaqp q d320 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring has negligible mass?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 100-N force has a horizontal component of 80 N and a vertical component of 60 lh:g xwz31cv;my(o vk+r-tp 5 5hk/ /ytrb7prN. The force is applied to a box which rests on a level frictionless floor. The cartr/obz rw15y p(:7v mv k5tkhghlc;py/3xr-t+ 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 hay, strilq(0i8xh1nce xpf. qbln0 2yff h2y( asj; 1b5king the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping bf b h0 ye2q lf81cjhi plqny0a 1.5s2x(xn(;fforce 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 floouu me;0yza k(-r to a height of 13.0 m above the floor. What is the change in gravitational pote-eyu; 0uazm(kntial 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 : 9i4zatjgx,5 2wokuuqy9xz) . The plane is 4.0 m long and rises 2.0 m. If the plane is fric2:q4 y o)9gkuw5zxta 9xzi ,ujtionless, 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 sprispu3s0-ovi*f; zxt n4 ng, causes the spring to stretch 2.0 cm. What is the svsxu-0 ;*fit 4sopz n3pring 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 )f;kjzagr 9,1v v*u hgconstant of 60 N/m. How much potential energy dkhag)1* u9zv f,gr;vj oes it store, when stretched by 1.0 cm?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Calculate the work required to compress an initially uncompressed spring objx,tqc-y2qy*j - ;ah7lefz(p 8ij ( with a spring cojoqf -2h cyx* aq(-zitj8eypl j,;(7bnstant of 25 N/m by 10 cm.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What work is required to d*xs*v* xdxp 0stretch a spring of spring constant 40 N/m from x = 0.20 m td*vxx*s 0p d*xo 0.25 m? (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 constant of 15 N/m is initially coh 2 (ru6 *sk.y+eyrioompressed by 3.0 cm. How much work is required to compress the spring.eoy risu2 hy*o 6(+rk 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 50-m high slope. What is tgfp,/vn h4/ +vtz;l5a-x zmh-eq plc 3he speed of the sll gvt-hx+54-qhz,/z3e n pc mpf/avl; ier 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 xa,q-,a qpyxx:8n((5;mvgsru fo- w poff the top of a hill with an initial speed of 4.0 m/s. Neglecting frictiop msuo -awa qy8g -x,(p(f,n;x5xqvr:n, 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 inclinp:sd5-s5 dor0n0oi dk3dn,q g i4-lowed plane. At the bottom, it has a speed of 9.80 mo5dqnn kog3ow ,-lr5ids-: di0p 4sd0 /s. What is the vertical height of the plane?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1.0-kg ball falls to the floor. When ihdw2lb5yi w5o 7h cyt17 (jfy6t is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How fasjy5wdyhy7fh71 b5to6 2lw (cit 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 level with a ksh,on-xuo5i 5er o)m;j b8 y8linetic energy of 40 J. At the exact top of its trajectory, its total mechanical en so5xlu )ohre,i-j nyo85 8m;bergy 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 masssno07 u z++,nuh6zujp m leaves the ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 106hzs j7+uu+ zpuo,n n20 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 thc,b s9 al j3as+vgvu7j+:n3j pe bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the rollj9l3pujc+ ,vn+7sab g:3avsj er 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 8 )l/+ wzh/tsl :hagf8a in7impoint 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 sltnlhi8al +z:gi) hswf7/a8m /ope, 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 abov/0bxlz x* qgvyhy)n2r+xc : c7e 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 scn vxy0+byrx xchzg) q2l/7*:lope, which is 45 m above the bottom of the dip?


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78#
 
  What is the minimum speed of tl7b4v)v :ve6 cfuj ru*he ball 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 p3 lbq+c3zdqd dzkh(,k a5dn3 .ulled 30 cm away from the vertical axis and released from rest. What will be 3l dc,.(dkb azz3dk +nh5d3qqits 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/vvf f b:fv/*:1dkw 3lis hits an initially uncompressed horizontal spring with spring f:v 1:fb 3*vdvkwl/ifconstant 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 )i1wrl ldt.e5her 2000 kg car to stop for a red light. What work is.e5rl w i1t)ld done 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 surfax d,8kpis fqm)ep a*n1)os9d5ce is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide before cominkef,sdd51s) po)nim* qx98 pag 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 surf.l.jyhtzbq69*p a; : dp2jqrwace. It has 24 J of kinetic energy. The2t.rzpqdbah : j6p y*; 9lw.jq friction 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 leve ,jhrhb14 hx)4q-wmsv l surface. The coeff4h ,mxj14v hhrbw )q-sicient 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 fromp 7g/df0 m(ft belyxy7y 2*j9x the top of a 50-m high slope. If the work done by friction is yff7gylxp jt m(9ex*yd27b 0/ $-6.0 \times 10^{3} \; J$, 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 p d8a/ 0yvd8amvlane is 4.0 m long and rises 2.0 m. It requir m 0dvv/8adya8es 3200 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 from rest at the top of a plane inclinedrsg2o8j 93t +ea4q xzc 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 ra9cs+ zt xj34qge8o2mass 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,49i9g)s*wet p nhb 0xu:u ,npf and strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts oesw) uh0t*n i9g4pb:pu9 xnf,n 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 enert ergn9-l)cc 2nyyzbo;*j+/9vawgh. gy when he runs up a flight of stairs 10.0 h;gcza- nb.yj92* +ynwet9l)co/r gv-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 constant velocity of +tx5y4j3dtc f5.0 m/s. What power must be delivered to the object by t45tcft d3jx+y he 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,ld y.qebzvfkqm9/;n. :wms0 kc -ws7 used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 y nwkqvc.lmk7m0sswzq.d fbe-:9; /, 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 l5dq(b *6ukre mb.+o rW while riding. How much force does her foot push with when she is umrdk.6*5b(lb eqo +r 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 0s q.3r gh02djvv1b) px to 25 m/s in 7.0 s. What is the average power delivered by the engine? (1 hprvv s)10.3 jxgpd qb2h = 746 W)

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