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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 expressefffn9i d9qc eu8ec(m48or 62gd 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 systemoyp5/5nz u9e w if there is no motion?

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you push twice as hyt-ibh jg0 ;dc l913tpard against a stationary brick wall, the amount of work you-bdp0g t;3hcyj1 t 9li 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 vertq6lvp8 h1w3r 3w2mbtoically and is being held there. How much work is being done in holtbwl1233qh vrw 6m8opding 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 horizontallbper), 70qm:jhoirf sa a2-9g y forward at a constant velocity carrying a 10-N object, the amount of wor:9oeh 0s grp2am-,a) j qi7fbrk you do is

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A container of water is lifted vertically 3.0 m then returned to its original po isx khjm1w)hdg53j- *sition. If the total weight is 30 N, how much wor1kw5h )-s3dmj* ihgjx k 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 actief m)b mk,1l;n)f np/png 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. Compare the signf2*7oywfs xm) of the work done by gravity while the ball goes up with the sign of the work done by gravity while it g xmfy)*w sfo27oes 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..a;4gyr:0eb u oih22dvc:wvd x) graph, represents:4 2v gddry a:u2.h0bo;wvci e

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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), wh 8w xhn00pgfh8zcpl j)ft1(x5at represents the work done by the force 8tw l( f ph0gzx0x)jnpch 51f8F?

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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 bbl.5 i nz0;oc,/wy vxthe 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 -xapbx5ox:kb1dm:kpb6j)8* e fr4 s bon 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 z(lew2:p rmr,zero, 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 is moving at tws*0-t7qn m2 teyei . *ozgzfc+ice the speed of the car. Which statement is true about the truck's ki+* oiy t0s*nte7q.mg fc ez2-znetic 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 w4,x8*c f1no wz h7j(kots7ja the mass of car K. The kinetic energy of car J, comparedjk*(oah,17o n8 ww4tj7 xcfsz to car K is

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object hits a wall and bounces back with half of its original speed. Whojlz ,mnmvx* 0/:71jy gyzkx:at is the ratiokxm,yl 0*7/o1vzyjzj xn:mg: 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 ant1 vnd txi*,h;3op lf;v0lcg6 d a 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 volhltfc0, ;p; tn dg v*3xi16mass?

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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 mov pv)ec/0xgn+sing with 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 travx0+ /gec v)spnels the greater distance before stopping?

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You slam on the brakes of your car in a panic, and skid a cert4y brkn(tmk1 rlnp00a f4;:qjain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the same b44jklaryt ;rqn f1 (00pm:kn 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 orbiknf2cpb3 6z- qt. Neglecting any friction effects, what happens to the planet's c b3z fnkq2-p6kinetic 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 princ r9;es:k6h,jr tw4svl6gih9uiple.
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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity mgy is

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity $\frac{1}{2} \; kx^2$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Is it possible for a system to have negative potentialw.55 b :yzklfu 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 r ngb0y6x 76or0bglb5x est a height h above the ground. A second object with four times the mass of the first if released fyb0g5g x67 lbn0r xob6rom 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 ob6 m6i c*phc+j:2mbree /+tz cf a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potentizc: tb +*imc+6cb2rmeje h p6/al 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 enk0hh f*puk:t7gd i05oergy of a system

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An acorn falls from a tre -frr68hp3wga)dy h .ce. Compare its kinetic energy K, to its potential enerca3 hyphfw.)r-r8 gd6gy 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 driving up-h tinr*, 7hql 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 slidin )xn r63sasoc-g with equal speeds along a level frictionless surface. They both slan-x3c6 ros) side 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 h,r kq4u2 9unp$m_{1}$ 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 for conservative for; 8wrhhmbwtcrnj 5*7 .cesm ;5 hctrjw*b.hnwr 78.
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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 bus1y ttw520l pckizwej.*f 6 s-ilding, through the air (air friction is present), to the ground below. How does the kinetic energy (K) cfspw-0tjlk6 stey*125zi w.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 distrs 9ak*f/6.eelv(k5abxhwm 4 ance and gains 30 J of kinetic energy. Do not ignore air resistance. kmbx4vha w 5/*ekf9l.a6s(re How much gravitational potential energy did the ball lose?

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball drops some distance8p9s*k1 e nnuk and loses 30 J of gravitational potential energy. Do not ignore air resistance. How much kn9pu8ks nk 1*einetic 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 cons1t) ( fc6eho5kouhg .o8g wsp6ervation 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 is3f:gdeavdg3 vnq,7k +6 x12t htwmkm8

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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 SI un5mzi (ho-ciu 1 q0h x/gdpw7*fits?

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Of the following, which is not a unit of pqn/mup6kn:*lyf r 9 ,bower?

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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 *wedt ey55f4mf6 vqr8 did 3 times the work in one-third the time. To do so, y5f dere 4my tw6*v5qf8our power output must have been

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  To accelerate your car at a constant accelerati 5p hw brsck+nq0o7c(9on, 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 object weigpy)3sfzg / y9j7;lmb*u x g)ric;yz(ohs 90 N, how much work was done in lifting if 9*zz7 )i;jycmp;g ru(l)xy/ ob3y gst?

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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 cj,ji hjc.3vr(1ju .q.0 m, at a constant velocity of 0.50 m/s. 1j ri c.hqj(vj,3ju.cWhat 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 con6aq,aa +nb 9etstant force of 5500 N for a distance of 50.0 m. What is the work done by , a9a6tenqa+bthe 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 witip w(1g7k0 xxnb6in(. r6eqech a constant force of 5500 N for a distance of 50.0 m. What is the work done by tnbxn ix e 6w.rk761(0igqcpe (he 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 consta)2/tkfkhu yio t2ak.(nt force of 5500 N for a distance of 50.0 m. What is the net wk/)(hi2uatft 2 .kko york 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 alo82yogmb- - b*.xn pbskeh9-oang 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,ia8y s95w:t+vy/ inl+* apx.szi4whzmt )br6 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 amw4 wopv)+z7tn icy surface (assume no friction), w7wow+vp )z4m tith 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 i.ewx2goy)*.y 7;z o hlhhe c5b5erzm(n the direction of the force. The graph in Fig. 6-1 shows the force versus the object's posm .( xhwl* z obhee.)zygo7er5c2;h5yition. 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 directionu;2f6wgurk dx 1w)0(bgjoj x 6 of the force. The graph in Fig. 6-1 shows the force versujg (6 fx;0wrb wduugkxo1 )2j6s the object's position. Find the work done when the object moves from 2.0 to 4.0 m.


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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direcuk3 30dlvicmk30 ;j nation of the force. The graph in Fig. 6-1 shows the force versus the object's position. Fc n033vld;kjmaki03u ind the work 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 tsk4ld.kufq5.llm9voh:2kep hg ; k 6.he direction of the force. The graph in Fig. 6-1 shows the forcl se.kf:59lo.h6k2 ku4pq.h mlv;dgke 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 aik+k api(van hqg9 yu 1y)u*s768 5gzN is applied to move a 55-kg cart (initially at rest) across a 1v6yi5) a1p qi(+g9uay a7hkk un zsg8*0 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 (if n ,9g 6d2q(igntie6b hduia)-guleye984x 6nitially at rest) across a 10 m level surface. What is t8 26eyngnigbe9-a6q 4uf,dilt6 ie ud(x g9h) he 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 is required kr7*m.-1c, agyo 7 q oviami.i)nu7ms to stop the m i ) yamsrkqn7oo.aii.u1-vc7m,7 *mgass?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If it takes 50 m to stop a car initially moving at 25 m/s, what e ( .j(qngx(a:)ne9 nb d;fasgdistance is required to stop a car moving at aqn;) egdfgja(nxb(n.:9 es( 50 m/s under the same condition?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring-driven dart gun propels a 10-g dart. It is cocked by exerting a force 6eqf *faa ax;mx;0f3oof 20 N over a distance of 5.0 cm. With what speed will the dart leave the guaf0fe ax*3x 6aq;fmo; n, 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 or mv1n* -vi,wr2d9v+xad ub:b nk; /xrf 80 N and a vertical 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 horizontally along the floor. What i v1a 9ux,w2b r:rrbi*+v;- mkdvxn/dn s 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 inkxx ))65lqyud (esn;l to a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stoppinlu)y6qk)x ;eslx 5(d ng force acting on the arrow?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 15.0-kg object is moved from a height of 7.00 m above a floor to a hei s(j)l:lgmg7y ght of 13.0 m above the floor. s(mj)l: gy 7lgWhat 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 plane is 4.0 my9)06 1xcsn/m.- ktxj cuqejy long and rises 2.0 m. 61uk0- /. cxtxqj9escyyn) mj If the plane is frictionless, 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 stretch 2.0 cm. What is mbw wyo410/hhr2r8vn the sp2wv oh1n/rb 4h8wrmy 0ring 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 constant of 6 7i8 cj*7p,dv ozvl9gd0 N/m. How much potential energyp*8d,j7v 9ozd7l ig cv does 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 initiao4z4fji0;wk 06sfd(5gb rrt ully uncompressed spring with a spring constant (bkt 4 4;o rw6fur0jg0fzsi 5dof 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 fro 74 xb7qfevoqd /l+8nlm x = 0.20 m ton4+e dl b7qfl8x/o7vq 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 c:7y -5fa 1lmekq6ve1 x hv-*ty; nbylxompressed by 3.0 cm. How much work is required to compress the spring an additionalyl5:y6q ax 7-f;lk-h11b*eeynx vvmt 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 restq.- bi 1d)tw9r ejnyk. j6guy6 from the top of a 50-m high slope. What is the speed of the skie yy)e9.6qd b wj u.6jkg1tnr-ir 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 the top of a hill wit)vs fyts8, i 4luya5)i ff:,oah an initial speed of 4.5ysff a:,yt48avif)is lou), 0 m/s. Neglecting friction, 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 inclined plane. At the bottom,w1dh-dcm y67nr5 9v f a39thdt it has a speed of 9.80 m/s. What is the vertical heigy1w9hv9 mfd h6t r c3-ntd7ad5ht 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 0.7o52u2yw z ;cbjt3wf1l0 m above the floor, its potential energy exactly equals its kinetic energy. How fast is 2wcu2 fzjo135w;l bty 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 grjg+ ; p71xdkzkound level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy 7; g+zpkd1xkjis 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 leatv e1t *-a8omuves 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 launch point, did it ris m o8ae-1vtut*e?

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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 poi21.(y cd m-tg c,hons-8qa fg)d+todtnt 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the digm)dd, ( -.2t-81fthoq scdan tyco+gp?


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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 q -tw .ohvj .wd4*iiowg+xe07above the bottom of a dip (See Fig. 6oqvwehjx4+i wog*t7d 0.. -iw-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 bottomgcx 2 eghl7:x3 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 slopegg2lex x: ch73, which is 45 m above the bottom of the dip?


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78#
 
  What is the minimum speed of the balkzqq2c 9wt3 :(.d 1ehtkgbd(pl 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 2-kg pendulum of length 50 cm is pulled 0.30 m away from the vertical axis3q psj2d2e, m(dv2m1v0ci gd n and released from re0,djq22d2mp (1dv icv em3 sngst. 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 i rgfz 8+nhh4x:nitially uncompressed horizontal spring with spring constanfhg:zrh+4 x8n t of $2.0 \times 10^6 \; N/m$. What is the maximum compression of the spring? (Neglect the mass of the spring.)

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A driver, traveling at 22 m/s, slows down her 2000 kg car to k6/:g ofb-pzwq/m6 bgfi43xc stop for a red light. What work is done by the friction force against6m/-4 c io3wpqk/bgf zfb 6x:g 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 hoax-rd)toyav8c c v2k5u h (l0+rizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/aurxad)o 28yc5ck+0l-v v th(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 J of kinetici jejm.k:;mzdr(g8d * energy. The friction force on it is a constant 0.50 N. How far will immdi g.jej(r;* 8k:zdt 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 lh.trz n9 hi9(mevel surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what ist rin(.zh9hm9 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 ozaaa8 f9(fifb5 mdgl,ip .7( yf a 50-m high slope. If the work done 7dy 9f mb8zliai.p a5f,( (fgaby 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 pushed8;.gic1xdx;:cra/e qmm x7i j up an inclined plane. The plane is 4.0 m long and rises 2.0 m. It requires 3200 7jm1gxaxr mxc8 qc;ei.:; i/d 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 the0fbx8(rp*t1o /uq mm e top of a plane inclined at 20e above horizontal. The coefficient of kinetic friction between ttrmom8fpx0q 1/be* u (he mass and the plane 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 droppedwa2qmqam/ sf4/q+,/ujh m5 jn1r nr3 k from a height of 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air 5 nqmmr+kj3 mhuraq/nas fwq/1j/, 2 4friction 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 us;v8y5k msdk* /c(ol1dcnknvr.u9dy 7ing energy when he runs up a flight of stairs 10.0-m high, i9nnrkck1o/ l;( dcumk.s5v *v y8y7ddn
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 needp; (cpg1t) mvred to move an object with a constant velocity of 5.0 m/s. What power must be deliver pvp g1mrc(t);ed 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 rtkmdj*e y8 :qp5oy t*h6:8 brruns for 1.0 hr? (1 hp yr5y:8*mo:8 qeh r* bk djt6pt= 746 W)

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cyclist does work at the rate of 500 W while -y6z1 fs b(o.z9 giyocriding. How much force does her foot push with when she is traveling at.zciz o9sg(6- 1ob fyy 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 -cni89-96ihf-wjy xjy;h g jd in 7.0 s. What is the average power delivered by the engine? (1 hp fwy--j- ighy h96n8 cx ij9;dj= 746 W)

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