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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 inb6j d+otzy 7/vs)qsx b )vjh51 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 nkt -i rf9 d ,ji,e4nny;i wtz5w;:)somotion?

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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 s23mzlgaf g -vr;k u) f 6:wse:w;wo+hrtationary brick wall, the amount of work youw r;h2auwk :+g:z6gms)vrf efol ;3-w 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 verti60j 4 qpyktv:vcally and is being held there. How much work is being done in holding y:6 p0vt4qk vjthe 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 constagfw(qo cl hs 9mf4c252la (4qxnt velocity carrying a 10-N object, the amount of work you do o 9mg ql2xq45a sc((cfw2lfh4is

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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 orif winv /ohq 4l.h,9y/7em;mtk ginal position. If the total weight is 30 N, how m,y4 /ne/9q7olhw;kv m.tifhmuch 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 object do work on the ob2t;ilhed . 3dvject?

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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 done by gravg3qr; u0gzq h17jl;vv ity whilzl1 7;vg v;uqh03jrqge the ball 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 0(avu6(ubv xxa +bk pamjs5+1versus position (F vs. x) graph, representspu6 k((uj5+v0 +bvms1xx aa ba

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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. xjey)gqneo;2 p b 3kh7o3a1t3d), what represents the work done by theoqea 3k)jdy2 p 17;3begno 3ht 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 kinet-lg(pfim*y (zic 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 thcfcg ft;fksk2yoy 36o8i(; m. e object's kinetic energy

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the net work done on an object is zero, then t rm fw6g2f(ye3he 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 muesurm)p; q,8z ch as a car, and is moving at twice the speed of the car. m)8rz u ,eqs;p Which statement is true about the truck's kinetic energy compared to that of the car?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Car J moves twice as fast as car K, and car J has half the mass of car K. The1s)c fx1l8ph 5r3sqq v kinetic energy of car J, comxqs rl85vs1q)13phc f pared 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 baxywgv. v:,t(u8dec/ b 6;igvx ck with half of its original speed. What is the ratio of the final kinetic energy to the initial kinetic energy?xxc8 e:/vg6v(gy ibw tu. vd;,

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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 movin2 n4muz f)/ f7oft7zwrg at a speed of 5 m/s. If both objects have the same kinetic energy,zwf 77t)fz2mfr o4 /nu 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 izbo/o,zl.,ms -zm(r *ba/ xm m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constantb,m rz(iomz.s,la/* b x-z/o m braking force, and are brought to rest. Which object travels the greater distance before stopping?

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You slam on the brakes of your car in a paniwljy r 2k9(1wex j3e5nc, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, undnjwy we(l2xek3j 15r9 er 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. Neglectingkt1:g2j6y3p-bqzo kn any friction effects, what happens to the planet's kinet1pqz nt-g jbkyo3 62k:ic 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 prikt r/3ir9u xd4nciple.
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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 - mu6cf k:cep z/zmne4ns01.l6owzd3 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 tp 7 jsi 2ikjfk-p/:xo1fzg,s)he ground. A second object with four times the mass of the fzj:gioksxpfjp)k- sf1, 27i/ irst 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 )xmb6ccf:kk .end of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the po6):bmk xf cck.tential 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 sy0rp .9r*yck vcstem

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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 t0(ll :rmi3w efm a3(b+h oi,psree. Compare its kinetic energy K, to its potential ener3, m0s+(m:lre b(3loaii hwpfgy 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 0 :nduqhnf)/a c :wx/d8mry,kx5o wg0ng 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 bl-ri1 ih(;rv very heavy object are sliding with equal speeds along a level frictionless surface. They bi;l hi-r(1vr both slide up the same frictionless hill. Which rises 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 n.rv c mzk8 qod5c492z$m_{1}$ 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 conseri8i kuz/u vun:vvxdx/x- .f17 vation of mechanical energy for conservative forces.uxv z1:dxufui./vn/x kiv78 -
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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 nj8b09pceo (oe3-p qe top of a building, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (je ocq9no be8 -(pe30pU) 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 distgb teh6o sw)81ance and gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential energy d)otw 8hgs6 be1id 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 potentia p0 9 i:ajbhd-c+g9icol energy. Do not ignore air resistance. How much ai9:j +hb c-igd90ocp kinetic energy did the ball gain?

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37#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the law of conservation o hf 3rrh8:lfg*f 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 istev 0(fh:hp-k

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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 4f c *pkfs5) z( bqygmndj0a8(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 n sd2, (lsud. aiy+v5vnot 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, yo xblf1xpw0fk+.9t *ah 5jbb2 ou did 3 times the work in one-third the time. To do so, your power outpujkw*bofl bfa t2 15 .h+px09bxt 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 musttmuwra,r ejp5+ 2t:zt: 1qaav42gx,s

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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 r8 gv(y+d)dk ml+ g*esthere. If the object weighs 90 N, how much work was done in d8m k)yvgd*er+(+lgs 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, at a consz/v /k2tt9lli 2d co-o hbb. digq0f+.tant velocity of 0.50 m/s. What is the work done by the weight of the .ho/9g v2cb+/tz.dk0o il-tdqbf2il 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 d; mx6 dffvoom9h*gdxn9aj , 9sf)l**m istance ofv9* nasd* )*m9mhxjmfx,;6fdl f9o go 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 a constant force of: yybi:fm(4vt6 0 ypwh 5500 N for a distance of 50.0 m. Wh6h fi4tbvy:y0wmy(p :at 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 conw nt4 xczvd7b:)(kqn2stant force of 5500 N for a distance of 50.0 m. What is the net wor7ktn:q42xwzcn( db)v k 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 alos2+f9t +j2wmd wl-glj b t(y*rng 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 ramp, inclinedo 14ew /ich94jwjqm-x 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 s/j )2kktovm yxdo70/ cwjk0hhi 1o33 nv ,tq(rurface (assume no frict,kr y7 tjoxt3oh30w0c do/nkjh (qv i2m1k)/ vion), 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. bf:lynrhasj 61 :dne-) qkl(+ The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves f(la : esqj)n6nd+k-bf y :lh1rrom 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 )jvo l6*-zzr9ilbq do;m 6v8mdirection of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the o llm;9rdqim6zzbjo-o* v68)v bject 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 i 9+qu8cta a;4 lhq-sz cb)xo3sb5r1e wn Fig. 6-1 shows the force versus the object's position. Find the q er c9zab3qxobac l4 )sw18ts;-5u+hwork 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 )o68y(b ots c0i3)5c e ypbtkgm.6:o )daaofp the direction of the force. The graph in Fig. 6-1 shows the foryo6:) 6.doecaysobpo 0ta( f3 )kcbm8pgi )5tce 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 to move a 55-kg cart (inia,do y gnh67*itially at rest) across a 10 m level su ,6 d7ion*yahgrface. 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 8z0h(tgmx o.iis applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What imgo8z.hx0t ( 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 workdi 9v.uix 38to is required to stop the masud3oxvi.t8 9is?

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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 mov m1m(2di5kv4u0dui* fc/ao zl ing at 25 m/s, what distance is required to stop a car moviiimo5 40zuk*/m 1lu2fc dva( dng 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,:m sw g-ztt f35d8lyg 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 neglz:df tywt5m 3gg8-l s,igible 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 ofx*57 ydi whik9z,l x0o 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 fli h*d7ox ix95y0,klzwoor. 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, stdd sy3 :)l)dhq6h,grariking the hay with a var dg3,sh) )dyq h6:ldelocity of 60 m/s. It penetrates 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 height of qvkv9 :l1ubsa1est0 wt o8yc21)er o:7.00 m above a floor to a height of 13.0 m above the floor. What is the change in gravita)1a 1kcl: ybt8qs2 evu1vt: o9s0o rwetional 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 4.0 m long and risesw klmby8g1p vm*h64 .o 2.0 m. If the plane is fricti.mg y8 omhv6*4 1pkbwlonless, how much work was done by the push?

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-kg mass, hung onto a spring, causes the spring to strethd eicgs/3qn( y*;0 ci (tn5irwok0;cch 2.0 cm. What is the spring constant?nr 0c3/goqn 0chte(iwky;c (;5i*s id

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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 60jjf yoj/e;u)qt8 3ym - N/m. How much potential energy does it store jmqto/e-8j); 3 ujyfy, 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 ini (gk4(g eeodh/hddx cg9:;2y/vvjmh 3tially uncompressed spring with a s/e3/x;g9:4gdmh d vhokchjy(ge (d v2pring constant 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 stretch a spring of spring constant 40 N/m from x = / ,)5qgmcw fv8peh2kv 0.20 m to 0.25 m? (Assume the unstretched positimvfkh p/vq2g5w8ce) , on 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 comprby9/yn0uo jd 7essed by 3.0 cm. How much work is required to compress the spring /uboy0 dn9jy7an 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 fromw:0lq ur4fou* xegr3fb 7g,4dt)gi dzo :9 l3u the top of a 50-m high slope. What is the speed of the slier on reaching the bottom of the sx7o4bt, d uie*u lz3 qg:grdw)30gfl:o9ufr4 lope? (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,u.iiq2wk )td 3 pushes off the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropping 102kiw3q d.t)ui 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, /(* ao1fdgxljyash .f 3e4 t6mit has a speed of 9 x e*4tah1(fl6sj ayfg d/om3..80 m/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 it is 0.70 m abovxhs cvib(cq gs+*59f 1e the floor, its potenti1c+gs* hfv xq(b 95cisal 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, blasts straight up from ground level with a kinetizjjj4tww3oy* 421sn et i6/scc energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical height does z 2wc3/6js it4jswyte4 o1n*jit 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 li1-bz0mn n1*y4fa7 /ea/.v vdc facakeaves the ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its lanc eaf a . v7acavf1nm/k/diy4 1*b-z0unch 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 aql2-;ev*ak i v 7vnc1)liz*apoint 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roa*v2z) 1v ;il-l*na ac 7vekqiller 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 45 m above: m4lgn 0ay1we the bottom of a dip (See Fig. 6-2). Neglect friction l yng4e10wam:, 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 star d(47v 1t3vyekmw2 fjdx+ u;kyts at 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 rolw7k v2 mxu3dk1+ ty fjev;(d4yler 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 b+t6npz y;v)p2aq zfi8all 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 away from the vertical axis and ox .+/p hzf*jq: )s+o s+aqsiwreleased from rest. What will be its speed at the botz/+pq+x fo*:s)a.j+iq showstom 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 initiallgjf)94 pxb4acy uncompressed horizontal spring wi pcg4ax4 f)9bjth spring 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 9d9eej9u* 0*qbjo:v f ghhrm/s, slows down her 2000 kg car to stop for a red light. What 9*d9bhrj9v ue/ fo:qhje0g*m work is 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 hb3t :se -2xginorizontal surface is 50.0 N. If the initial speed of tngb- 2x3is:ethe object is 25.0 m/s, what distance will 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 movi 2s s.0p7;l37 t hoi4kknlkzyyng on a rough, level surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.o7;ssk03nl4k .7p iz l2kythy50 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 horizon27*yprqoe+wt 6tj. g u,3prodtally to a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved ad o t7ryrpj,we63u.ogt p*+q2 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 /z)xby g ezq,- ae)-x8stn8x r-o5bqv slope. If the work done by frictionsr-gbt -zz)8x / bxy5qoenxqv )- ,ea8 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.4c3g43ceeg ejv7lh h1*el /ns 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 tv3jlg/4e7ee sn egh3c*h14lche 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 rev6 7riopyg xy- gtn yd,0lz2 ldsg28b+439ixwst at 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 ofxztgob-yggi7 vndy ws+8 d 6 2lyrxp3 ,0429li 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 fd hl6+ 0x)i /k8bu7xwv/adcxfz1+qm crom a height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. Whatfxza)c/h+q7 lv wdxuc6/ bdm8 +0k ix1 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 when he runs up a flightk,zp3 ( r/esro of stairs 10.,ko ser/( rpz30-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 conszwl*ojle/0- :g6 m5f so-f) q9zbnvnktant velocity of 5.0 m/s. What power must be delivered to the j*kb)-: o nw/5qfz0zm 6os-lvef 9nlgobject 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 moto:c ty34c c*we:il q-sh pb(b,xa6ys3p r that runs for 1.0 hr? (1 hp = 746 W-ab,:s3 y4 p3 spceilwcxbyh(:* qt6c)

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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.s4-ih6tkl 2f+bp t1 kb How much force does her foot push with when she is t 1f4p-6skltbbh k2ti+raveling 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/0i b8 rm,rlh,o8l )e8gv 9e yxky+l4qcs in 7.0 s. What is the average power dql 8oyrm4rkv h 8)lygb9x,el+ice8 , 0elivered by the engine? (1 hp = 746 W)

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