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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 in SI mmtjstb:)(j ,oygl h- ;;+oij 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 akwg btz xbsy+97c6 e.- system 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 hard against a stationary brick wall, the amoun at21ir3 rx0urt of work you do2 urx03irar1 t

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 50-N object was lifted 2.0 m vertically and is beipq7rki 3yk 0v+6n8 ;queco ;dcng held there. How much work is being done in holding the box in this posik6o8 7qen qkr; 0+uyc3ipdc v;tion?

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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 asvw6h ak,0cc+d5p 4fat a constant velocity carrying a 10-N object5c,0c dw6hkfvps +a4a, 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 lifted vertically 3.0 m then retuh( x)2jxbzl- brned to its original position. If the total-h) ljbzx2b(x 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 force acting on an object do work on the o rftkmw0gp 1 aa*1e6p/3:q lpcqd5 (ipbject?

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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 straightov 1( f,ri:/ +(puz6 n zaiv:nbd9wgub up. Compare the sign of the work done by gravity while the ball goes up with the sign of the work done b,1 6:v n(o+i9z:v(nurwapg/zbd fb i uy 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) w 8:kq)wt-pjlzhfm 56 graph, representswj)zl5 -k f:6wqp8t hm

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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 re(v xbw86mv9w bpresents the work done by the fo xvbmw96 vb8(wrce 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 oilhuj3 f 6:5tyn an object is positive, then the 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 negative, then t +ktdf)k*04c p6htas ghe 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 the objtg -ero5 wsna (w62ag.2z+nsjc(uu)(pp jvx2ect'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 twice the t+m 6.lr: ictam,eqz2speed of the car. Which statemer2it. q mlz6,te+ca :mnt 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 epjjpc6 1)6d:ryfa 9hthe mass of car K. The kinj df6jap:c 9 yph)re16etic energy of car J, compared 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 prmgmoc. 858b:l.g w zback with half of its original speed. What is the ratio of the final kinetic energy w l.gzp m.8r8ocg:mb5 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 movikd/or c )i-x4o1 b+3(widmhz png at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio od 1dihcm -+3zworb)kxp(/4 iof 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 mass is moving withgec9it,vm(anw-4j d0 speed 4.0 m/s. Both objects encoun ti,gw n( 4vdac-9mj0eter the same constant 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 panic, and skid a certain distance j zy 7u xz;eh,jfozb(2 i9t-z-on a straight, level roa t-f9-,b z;2h( ixeozzjz uyj7d. 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. Neglectzfs +n-sdibjyqq5( 3p:;jfomx;i / 4ving any friction effects, what happens to the planetfz ji bdj qy -npf(s/m;x4v5ois+;:q3'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 principlde.reehjc607c5 ; 9slio /khj- f-bhwe.
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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 potena3san+jhn / j1srr(k+wu 2t5ltial 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 rnb4mtb -ok0:3 gb2bq eest a height h above the ground. A second object with four times the mass of the first if released from the same height. m0-4qo k gtneb23bbb: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 szh(b8gj+bb )b pring causes it to stretch 5.0 cm. If another 0.200-kg mass+ghbb)zb 8b(j 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 en8;j; j ovm +c1jcea46n3llvsyergy 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 tree. Compare its kinetic energy K, to its potenti31k mw : qyh .hv+4njxanu6ba/al enerj3amb/xy4v6. k u:nwa+1h q hngy 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 5y5v/1u9 mz1c ahhct tdriving 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 vd b,tf-n*cb g4ery heavy object are sliding with equal speeds along a level frictioc,g4* d-nbb tfnless surface. 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 9insjq l:0 o9ar qry3*$m_{1}$ 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 cons4 . aotvef)e/2yz8pg qervative forces.gvypto e./q)42f a8ez
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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 friction isyvthiy9,x7)k* gf1ao present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the potential energy (U) at tvy*a,7x 1gyi)9 kofh 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 c g9 d/4pid p,d *hvk8g0qbsf0energy. Do not ignore air resistance. How much gravitdgf 4, q9bh p*kdsv igp008/cdational 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 grus rhvi5n98*a iv9bwjx p9 +5navitational potential energy. Do not ignore air resistance. How much kinetic energixh+sr *95n9nup5 9v8vwai jby 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 conservation6ih,bcr 2p6fo 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 isl:nlvc-lr6a d)))i5 .eca *6sjbvc zj+l9mt g

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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 unite4i slrb982-i7 uprp78qvoya s?

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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 nocs1 i 5t,zpff9j+ b4qfhzm8 z)t a unit of power?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to yesterday, you dii-h-ecu/ puo5 d 3 times the work in one-third the time. To do so, eoc5u/-u- phi your 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 ac axwd0b7a*g6 w0jj*9clb;mg b celeration, 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 t0h *v vkh(vb* hzk+cd-here. If the object weighs 90 N, how much work was done i0hkhcb+h kv*d v-z(*vn 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, azoy:s nho8 46o /opjs:t a constant velocity of 0.50 m/s. What is the wor :os h4y6sonpz/o8:oj k 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 constant force of 5500 N for a distd9hqe,mkh i8hd,4wip1 8 9w y5hmm (fxca.8zlance of 50.0 m. What is the work done by t, dwfh 1im e.dil5 8hzh m988a(9qwkhm ycx4p,he 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 withvbl* 9sr-o hr6h*c8ph a constant force of 5500 N for a distance of 50.0 m. What 98pr* hlhrovc6-sh * bis 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 constant fghjrm(,5 * agxorce of 5500 N for a distance of 50.0 m. What is the net ggx(r, 5ah jm*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 along a 78tiv;p :/ pq)tktyd;ehq1d s$37^{\circ}$ 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.2;ggs: yw;bc-jw j k:4dki vf;ulb;d 8.0 m down a ramp, 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 (assume no /2t. h ;5ruzwmj(tpvjz76 y zyfriction), with a fm/v zhywu 2t.t6z ; 5py7jzr(jorce 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 Fig. 6-.d)x i)y;gu pq1 shows the force versus the object's position. Find the work done when the object x)q);pygiud .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 objecmudr j +y bksl/82r.z4t in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's po4 sby+ld kr8./zurm2jsition. Find the work done when the object moves from 2.0 to 4.0 m.


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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the force. The graph in F 4 3zw9jqbktu7biq8t 9bzd6286ohgopig. 6-1 shows the force versus the objeco6wz9pbtbh8dt93 6q7 jz2oqu4 b i8gkt's position. Find 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 objedc5p r/sl1 f0fct in the direction of the force. The graph in Fig. 6-1 shows the force versus the object's posi50rpl1fs / fdction. 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 55x-dxxuu3p c +y,0r)j ,menti;-kg cart (initially at rest) across a 10 m level surface. What is the final kinetic energy of the dm-j;x,i cxr tuex , yup+3n0)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 rest) .og*0 ,iq+tarvj u de1aqj +iedra *ov.1gt u,0cross a 10 m level surface. What is the final speed of the cart?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-kg mass is moving with a speed of 5.0 m/s. How much 1tb7b94s-f +r5fd-ca pamuqpwork is required to stop the mas5 cpf- at94umfqbsa-+br7pd 1 s?

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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 initiallmzu73io1 1i (0-ahmwqiqqrf9 y moving at 25 m/s, what distance is required to stop a car moving at 50 m/s und fq qw uh1imo-i0azir1( 3qm97er 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 /b/e h2wy0 shqlh rcne45i9i9 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 negligqwn9yb/iis e2he05/ cr h9hl4ible 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 w ls73 s9(+a1c;eggacisgv )dof 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 starts7 e9cg;vwa1)c s(sg sigald3+ 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 iapkp9:pen8ho id37/ bale of hay, striking the hay with a velocity of 60 m/s.kedp3/p8 h:o pi 79ian 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 hei6 b+fvlzo *t sj-8wd*aght of 7.00 m above a floor to a height of 13.0 m above the floor. What is the change in g d6 t*+b8wj l-vs*afozravitational 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 incxjxxa;/*fn 5rlined plane. The plane is 4.0 m long and rises 2.0 m. If thxj/ r*x;5f naxe 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, camh4du)-f h/si uses the spring to stretch 2.0 cm. What is the spring cu s-mi/f4)hhdonstant?

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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 rwu:2nbnqro3ml ti93 u e8ub5ag1o b76*ahd4constant of 60 N/m. How much potential energy 3nu68r9u*wig q3tbo2 17 : elmb5unaabod hr4does 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 uncompzmj4ho5: yyj-: 1jobiodorf q *a- 4-oressed spring with a spring 1joj h :4-i5bz*q--yjd4oy:arf mooo 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 tr,gaac*+ zu4a o stretch a spring of spring constant 40 N/m from x = 0.20 m to 0.25 m? (Assume the unstret* c4agz,+r uaached 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 compressede. hk6t(d gi-l29f pds by 3.0 cm. How dg(ts.6-ed9h li fk2p much work is required 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 n -au** ruc1rm6p 0cjmrest from the top of a 50-m high slope. What is the speed of the slier on reaching t6mp1jru0c-*r nac* umhe 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, pushl:;bjacm :zo y na.)2les 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 10;c::o)anyll2amz .jb 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, (xbslurz c/w ; x/v6e:am6s2oit has a speewb eu;z:sx o a2s/vr6/xc m(l6d of 9.80 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 above the ur8xsf 1 em g (/hta1s,zjt5;kfloor, its potential energy exaj;zrft8 hkst(15/ex,sam 1ug ctly 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, weighiny smf-+i q)a1m):i jfsg 10 N, blasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical he fsi: )q-mjsay1 im+)fight 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 kinmrz e/1xc0ff,etic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its 1 f/,mfc0rxzelaunch 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 bottom of a di h axfrwsti(,tqx,m(/9 ft *d/p (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope,*(a (x sq x9/mf,trt/f tihw,d 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 0a: zvu ymsq)upx9k gs:./p,ak e/w j345 m above the bottom of a dip (See Fig. 6-2). Neglect friction, whp)ka vwxaz km9q:js3, /ue.u: /0psgyat will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?


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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts at a point 30 m above the bottom of5,jn/i8ac c jv 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 slope, which is 45 c5vnja8/j ,icm above the bottom of the dip?


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78#
 
  What is the minimum speed of the ballx4s8owmpw* * 7n- .ok7dg vpjs 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 :x6hp.ykg bzu*if2y2 i ;gv/ 3ymd x(ppulled 30 cm away from the vertical axis and released from rest. What will be its speed api y. i:gk;*gvy/xpfh2(um3dz6b 2 y xt 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 uncomufihytf1yk c , ()nrey/(u. 8bpressed horizontal spring with spring constany((ek uucfn1y, b8ftyihr. /)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/sa4g+pocnq*7 *+qa qsu, slows down her 2000 kg car to stop for a red light. What work is done by the friction foc+ q4a*q*7 u qnagop+srce 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 horiu,;tfr86jeyi 3bbp9mm.-b zf zontal surface is 50.0 N. Ifiub ; jbm,6ze.y bmp 3rt9-f8f the initial speed of the 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 moving on a rdua5fy*-d j 4x4ds:( dva, 8uvegfu8qough, level surface. It has 24 J of kinetic energy. The friction forcev4udyq vjf a ug8-s5d x*def8,4(dua: 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 level ufw9 ,ulwgh.6wc*r6 k surface. The coefficient of kinetic friction between the mass and the surface is 0.20. If the mas ,ucr*w h.69fwwkl6gu s 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 co5-pu * jykekgw2b ;1thq.(uslope. If the work done by frcwpth(qy gk;- ubj e.1u25ok*iction 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. ua .ny rs2 sn(vxp),u6wz-m; u 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 the plane. What was the magnitude of the na(w;u,-svy )2x um6nz.prsuaverage friction force on the box?

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 2.0-kg mass is released from rest at the top of a plane inclined at 20e abo sospmhs9n51kre6s0)c e; n9s ve horizontal. The coefficient ofesms1ser 9s on6;p9hc5) 0nsk kinetic friction between the 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 dropped from a height of 10.0 m, and strikes the gro4gdu3(ae- p 2w pif7o lhtz6p)und with a velocity of 7.00 m/s. What average force of aii-6wtezu2 ( d3l 7h4ppg aofp)r 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-9pg ,4 g use.iepshc n;xj2e4 a flight of stairs 10.0-m high,p-4p uhsi.cg ;g2sej e9,en4x 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 jlk *-.qa h 1edp4s)uxan object with a constant velocity of 5.0 m/s. What po)4a1 eps .-ujkhq*l dxwer must be 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 moto* oam70i. sw )fehq3qw0qzg gl/ 6vqslu0 g.1br that runs for 1.0 hr? (1 hp = 746 W1ig0gw*.7z/helb su0o.q3sw60l mgav) qfqq )

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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 rat /tqs6ef* je9te of 500 W while riding. How much force does her foot pt/est f*9q6 ejush 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 fr rf .iwcfe2 5*hqc/rs)om 0 to 25 m/s in 7.0 s. What is the average power delivered by the engine? feh)srr *.cc q52wf i/(1 hp = 746 W)

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