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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 u//srkw0 :wtj9 azuza: nit of work 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 w xg-eq1 0jdfqn7 bj(2motion?

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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 aor qq,vy4j+rjq q(uu2y./l *against a stationary brick wall, the amount of work you dqouqrr(/j vy,+*qu .jl24ya qo

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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.rc. m +xv8 l/nplu)ezs v23kj :.7pioj0 m vertically and is being held there. How much work is being done in holdinijp.:kj/eunz l)7. 8lx 3+v vomrs2cpg 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 1cz x+p6c mwg tq/2sl7forward at a constant velocity carrying a 10-N object, the amount of work youtsc1+ /qp67zglm xw2c 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 ypgp2.lru / ,eb 0e6rxm then returned to its original position. If the tbyrp0eg . 6l,p/e rxu2otal weight is 30 N, how 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 eg8 gmj*++ymyk 4 u.vsforce acting on 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. / 81isrhzv u1l Compare the sign of the work done by gravity while the ball goes up withi v81r u/lz1sh 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 vs. x) graph, reprnb2 sv-oi8bp(cq f5 l4esentsi4c5 8vql-2sfop bnb(

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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), gr2mv,9qyw )(k ) icsnwhat represents the work done by thmqs vic 29n)( gkr),ywe 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 tq9ioo,ot(3 (sesbu: z he object'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 negateko4xo2 a et(q5s 4u +ba+dqi-ive, 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 zerowiifn d,1q99v lch+0 m, then the object's kinetic energy

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A truck weighs twice as much as a car, and is0+ e-tpv9leq,g*k- msq as2xn moving at twice the speed of the car. Which statement is truek0+vsa 9g-,ex2qesp mn* -tql 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 orjb o-cq; qz8 prha.+t l* qt8qj,z4(hf car K. The kinetic energy of car J, compared to caz jho.b,tp 488;ltczrr- qj(h+qaq*q r 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 1uo qq00kh,ni half of its original speed. What is thuni0o,qh10q ke ratio of the final 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 pebble is mo.6wsx9h xij 1j: bqi4wving at a speed of 5 m/s. If both objects have the same kinetic en 4.xjihwi 61qb:wj 9sxergy, 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/s. A 1.0-kg m41ggy1 bpxh,lw( 0c ggass 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 greaterw1,cx ggpg10l4 (hb yg 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 certain distance ouxq omg6g2p62ci(ayh j4 y: a-n a straight2jaxay(2u q i yg:gmp64h6-co, level road. If you 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 orbits the Sun in an elliptical orbit. Neglecting anyfngdr14re z /u1m+m1i friction effects, what haprgmf1r /+ez4 u1nd1im pens 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 principly d bg,mo+/q9el q/pske(g ot(s9;z /ke.
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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 syscw1 kg(qb j29ptem 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 gr;j,e*c+av vzx0k0oqround. A second object with four times the mass of the first if release*ja+v x ,00vqczro ;ked 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.qkc2iyxa pem/39)g * v0 cm. If anoqgi2y)kvcp/ e3ma9 *xther 0.200-kg 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 energy of a su4c6 g n+4ebjhystem

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An acorn falls from a tree. Compare its kinetic energy K, to its potentim1r n9o)gn 7hnal energy r9nn1hgm 7no) 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 cavtadv 8md9 :bvz//6f tr driving 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 snk 11r8)r/ +zpahn ubnliding with equal speeds along a level frictionless surface. nk1+ b81rhrpn a/)unz They 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 9nnl b7 j7x3o.g n4uf.p-spr2f s* xkf$m_{1}$ 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 oh (k f9 -ghbc4.u kung/j/zo1gf mechanical energy for conservative forceshgc4.knj91h o-ukfg/bz u /g(.
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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 (air friction1i m5kn )h(ju/eb*ski is preseni 5k(*1ehjbi/uk s nm)t), to 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 z*0ztos( jx*y, * lwz31pzy4tsa r hn5not ignore air resistance. How much gravitational potential energy did tp01yxs5*zr4 alw*s n jz3h*t( zot ,zyhe 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 lj.8vczw5m 27kj :swd .wzl.0 aious h7oses 30 J of gravitational potential energy. Do not ignore air resi0jsz :h m7..li7zws5c2wdj 8owuakv.stance. How much 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 conser-f ii -sk fcsi7q542iavation 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 isgot 5 o2e8 ;1vcvk*q qtmh70zf4k3qnl

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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/x o:aaa;k4 uya4bjz: power 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 is not a;wu6p 5ft9 lfvyq* mp+ unit of power?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to yesterday, you did 3 times ther g*nr)v1 sf-y work in one-third the time. To do so, your power output mus y1rn* srvf)g-t 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 aumt 8.er3b3j i2qu+blcceleration, 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 m and held there. If the oqw0k pv-u nyp+ 8z88blbject weighs 90 N, how much work was do-p v88z+q 0n kp8ybuwlne 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, at a constguddmp c 6;-j4ant velocity of 0.50 m/s. What is the work done by cd6j ;dm4p-u gthe 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 distano-ue2; .izclp ,aw7po x:zm4wce of 50.0 m. What is the wep lzpa; om:owu,c-x47i 2.wzork 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 pul q/h iynd() m 4x7d,jwfmn(1moled upward with a constant force of 5500 N for a distance of 50.0 m. What is the work done by the weight of the elevator? 7/1diwno4qn(h(x ) m, mjyfmd

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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 w /nyn*.v9d5lqmd3 4gs4ow u xvnw4o8r ith a constant force of 5500 N for a distance of 50.0 m. What is the net work done on the e wddnx qm*g3oy 5.o/s vr l8n494w4nvulevator?

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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 alon+ kwzbux,5 /ojwnw kh vr82/x8g 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, inclineqv 3rymn/wgw2v1 s 3-wd 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 siste ierp*qgzr +1n44y7grr Sarah in a sled on an icy surface (assume no friction), wit47i1+e 4gg n*rryrq zph a force of 60.0 N at an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the force. The graph in 22o u7h y3nio(p)j4y mtg4bhuFig. 6-1 shows the force versus the object'sgm44op 3nhuh7u 22j)yboi(ty 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 direcxvidtt 8)c1 ir pb* 7m:w:fuj6tion of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the f 76m bd:rtt)jwpix*c8ui v1: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-iud p3o+9;b* uoz+eud1 shows the force versus the object's position. Find the work done when the object moves from 4.0 to bpui+zu3o d; e*uo d9+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 dirft,ux5ib4 g48n -dnzpection of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object move,n4 izf4up t58b xgdn-s 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 (initiallr;wssp7o/d x3k d o1j u8i89v5 mwodu7y at rest) across a 10 m levo37; w s vkw8do1u 8d9ud mpi7x/5jsorel 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 gd; 3wx)mhg1(plid6f 200 N is applied to move a 55-kg cart (initially at rest) across a 10 m level dwgxfml( ; 61hd)ip3 gsurface. 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 ayl9mdh5 7qj*3kdn. t q speed of 5.0 m/s. How much work is required to stop jh*ym.lndq kq3d5t97 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 wfh*(wqk u 6j+stop a car initially moving at 25 m/s, what distance is required to stop a car moving at *wqk hwj6f(+u50 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 10-g dart. It is cocked by 4ykti(llsjaxp9 bav)p2,o (w3.ls4k g-(dbyexerting a force of 20 N over a distance of 5.0 cm. With what speed wi,3 b ot4ypy((( sd.l gs w-av)p29kblaixjk l4ll 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 componenl ed0:,unbg pc 9 ) eznhu++2hecep;2rt of 80 N and a vertical component of 60 N. The dc) :2pzhbue;nhc + 0,p+ 9gnu2 eleerforce 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 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 horizonta *8t 8o2j6 d;n bfwtyd3g/zkeqlly into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm de 8y tq 8;doztk6wjgfb/n32*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 oe 1nwp *y7k/a6wbk q/lf 7.00 m above a floor to a height of 13.0 m above the floor. What is the chan/e/kp l wa61k*byq7n wge 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 t+)puon(ys po ou90y4. The plane is 4.0 m long and rises 2.0 m. If the plane is frictionleuoou0op +)4s y(yn 9tpss, 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 stre kj;fq1sq/:4i ub*aoz tch 2.0 cm. What is the spring constaq/;z:k 1 obujqas*if4nt?

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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 r6d y y2h m;v:qzc4c+dconstant of 60 N/m. How much potential energy does it st:dchv; cyqy z6mr2+d4ore, 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 g xw g)oz(f7sw7 k o7;irdyk)8with a springw)gs(xkwo7 7id;yg )kfozr87 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 ofa.chg..p t2 )3fltij ftwg)f-h )pvq/ spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstretched posipai /h g.t-fq..j3ftc) 2g)hwvp l tf)tion 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 n7 k*ddd (:v+lesyr u,is initially compressed by 3.0 cm. How much work is requireuv*des 7 yd,:r +lnkd(d 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 starts from rest from the topa74(hjd 4se u/wa zcq3 of a 50-m high slope. What is the speed of the slieu4ch esqj43 7(wz ada/r on reaching the bottom of the slope? (Neglect friction.)

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A skier, of mass 40 kg, pushes off tkbx6hpr z83ugdnf c9d 34pm2) he top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after8pd)r4f n 6hm39cu3pk 2zdxbg 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 planen6 xy0jei:1 pz. At the bottom, it has a speed of 9.80 m/s. What is the vertnxijezy p10: 6ical 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. Wnth0- l,v*nm,e 7pqav8hll 3e hen it is 0.70 m above the floor, its potential energy exactly equals its kinetic*3e8lvv0l 7,mnpae-hl t nh ,q 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 )ilb 36z*qygvlevel with a kinetic en )vz*il 36qbygergy of 40 J. At the exact top of its 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 ground with a kineotvv2gqep1r ;6 v.(r( eyckz /,wt:ultic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical heightrku2(.,:wy tt/ re qvpvcz16(v; olge, 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 bow)8kgix(p u b6ttom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the to b6()8w pxugikp 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 abovea xq wizva1 o1,w-*t4k 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 1aivw4 z,ok*1a- wtqx 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 3k qiojme iyl3-yt4b+1 8qo (na dip with a speed of 25 m/s (See Fig. 6-2). Neglect 4q(n1qmo-y l+boi 8k t3ej3yifriction, 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 the bottom of its s: * ppsoy vgpk; ,9gj1jgjkh- 1xa8km)wing (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 a:z43u2 z qykq l)j2wul00ew jags97 ajway from the vertical axis and released from resq07l2wgu)40klzz j9ayj3ewa:js qu2t. What will be its 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/s hits an initially uncompressed horizontal spring e0agjo:we0 d ,w(*abbwith spring cons*aea gjo:,b w( e0w0bdtant 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 k3yax, nshls7r-8 fi(l92)shq h o zo2ng car to stop for a red light. What work is done by the frxl8y ni)o ,o(rqz2nhl 3h h7s9s2fa-siction 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 (+ c,ib 0 t * q.ce8cjbsa3cvib6kmg+lbetween a 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25c gk*c3q .v(+ jib0t8,lb6acb ec+msi.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 moving on a rough, level surface. It has 24 J5msips.g .k zg-2ag w* of kinetic energy. The friction force on it is a constant2*..a pg-wgmisgs5z k 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 level surkrc0dr3 : fg-ag79m alface. Th7rc 9: 3g-rda 0kgmlfae coefficient 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 from the top of a 50-m high slope. If theck6l: ju6af/s o;oy0q work done by y/;uso6qaofl 6:0jkcfriction 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 7mk5xgcd/ p27r7bnqd . The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work to get the box tn752m rpk c7g7b xqdd/o 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 h0pxixg 2 /ra,the top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane g r/ah,p0ixx2 is 0.20. What will be the speed of the mass after sliding 4.0 m along the plane?

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 30.0-N stone is dropped from ai0t+ o txpwj3m7gfu9* height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts on it as it +xt3ou jimp9t0wf*g 7 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;d2t czu3h;wlgf .ig*bg y /d- flight of stairs 10.0-m hig- *.g/23 dtfu;gzgdhyb c; wlih, 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 vevmom0d8j. 5jb locity of 5.0 m/s. What power must bebm8 v .j0odj5m 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 energy are used by a 1.0 hp motor that runs for ,elqff: 62yevo 4lb ,fh;/n .(epitff1.0 hr? (1 hpef t (ffoyqih,ep;,2:b.ev64/fn l lf = 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 ohpc7wu r6(le .f 500 W while riding. How much force does her foot .6chepr7 u( wlpush with 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 2pgb 87 6y6krzu5 m/s in 7.0 s. What is the average power delivered by the engine?6u78kp6z gr yb (1 hp = 746 W)

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