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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 0d1nmg),h:k; v i nn+c2agjfsexpressed 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 moja 5t6-4iuqxm,ktv:k tion?

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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 bgi7;1k7erzih4va+ h o rick wall, the amount of work you r7kg7 i+z ;e1vhhio4 ado

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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 being held there. How much w uxn7 *l,pn:mfork is being done in holding the box in this positiox:n,7fm p* unln?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you walk 5.0 m horizontally forward at a constant velocitw) g;5xrrgxel,b22 js:d-na6,c mq pgy carrying a 10-N object, the amount of n acgwr-ebp x2j5 2dl)gq,;m:6 sx,grwork 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 lifteduzai 5,5r c-zl0dm e-a vertically 3.0 m then returned to its original position. If the totuzaz-edli,- c05ra5 m al 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 lv qvyp)0m+92 4ztem lps ,fzz:yr81uan 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 s:ezx2 c fiv4x2,n6qo+oz izj 5ign of the work done by gravity while the exz io i5zq:n x+vj2,oz2cf64ball 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 Forcxa8fv -rdx -e +uji,m+e versus position (F vs. x) graph, representsua mr -+i 8-exvfd+j,x

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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 represents /yljc.3 dg bldmo ftuu.1d9j6)5sh c;the work done by the forcc3.b/ l6oh mj tf9;1ud)yslg.j dd u5ce 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 *,aakmt7tf yak3 c/ pr:3y3 qtis 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,d wi0/ u+pyhex)8 rqu8 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 ze) bb9 zk tmv9p7qy):txro, 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, zur xoo+h-0 *gand is moving at twice the speed of the car. Which statement is true about the truck'o-xu*hrgoz + 0s 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 Kn.*o bj 89xlvz. The kinetic energy of c8 n.ojl9zx*vb ar 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 and25opqb 5 xtsu6 bounces back with half of its original speed. What is the ratio of the final kinetic ene 525u pqto6xsbrgy 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 abm(j0nai1fnfl4t3gh l-7z a / speed of 3 m/s and 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 masi(ba41 73z/-hatll njfg f0mns?

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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-kgm z-qxaw0:tnf5b, ,b y mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object trayb ,nfz-qa0 mtwb:5,xvels 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 ,5cicc+jxdyeq +ct,h 3hj7v / of your car in a panic, 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, under the same conditie+/,+hx c73qc5, tjydh civjcons?

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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)gco. 7h7sa bg6j g ks2dad2m6 Sun in an elliptical orbit. Neglecting any friction effects, what happens to the planet's kinetic ene 7.cg2d aahs6mo2k g6)7gsdbjrgy?

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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 prh(s7; mw--.oscn6 (7bukrjjiugmx9 : as 1aphinciple.
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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 sy4o v;jh;kj,fv c+hn x6stem to have negative potential energy?

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is released from rest a height h above the ground. A second 9kvkc6e9bc/ kobject with four times the mass of the first if released from the same height. v969c/e bkk kc 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 cauf-x0xt1o am/t ses it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potent /1t- famo0xxtial 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 nksr ptpoa(58b p52q0 dy- 8qfof 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 tr0 0 ss9a (yl dmlg1uc:yiu57zbee. Compare its kinetic energy K, to its potential energ1 mau5lz (9sy: ds070u cgybily 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 wtj+vcplzonx/2t0;5/, eez x 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 t x0p3s(*8ftlspoc 9z* xrn j8object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Whichlx(zntrp9t08sjs f*x*3c8 p o 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 -w:4-o*l* ) qdqqcxpzy u3. .vbiyycl$m_{1}$ 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 conservaz-;e.4 kvvkvpvx: 3qj:ss b c3tion of mechanical energy for conservative forcesv:kjqe s:c vbvk.3 s-zp4;3xv.
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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, througw:y g8ysw 7k3j*f3kdth 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 (U) at the top of tkw38kg :sf3yj*dt7 wyhe 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 of0g- b,i5 2plmvhwuij 1 kinetic energy. Do not ignore air resistance. How much gravitational potential ener1 m-bjugiwpv2 lh,i05 gy 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 at)1* loh3 ftnc du*.h30 J of gravitational potential energy. Do not ignore ai1na)* htof. luhtc3 d*r resistance. 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 cons17qrgz s ;6ar-ydq.v hervation 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 is)qsgrpd xet),22+f iea48l i h

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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 o:va7 ,0whfk (9upnk 7cvm.xpd f 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 unit o8 z.j4csxk;*j+d g4fc6 9:ypyb wf imqf 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 the work in one-third the t,ouy2 j9an7n hb2 j2ngime. To do so, your power o7oyb2,g nh922n njua jutput 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, trlq(ppj 71t+ she 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 9k pq3(cmp9isthere. If the object weighs 90 N, how much work was done in lifting it? c(mpisq3k99p

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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 a4 2-sfmuuywyxyk9 m: v2y54ncp :oyp) distance of 1.0 m, at a constant velocity of 0.50 m/s.5 y:m4yup4 o yfwcu2y2pvsx ):y9mkn- What is the work done by the weight of the book?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled upward with a constant force of 5500 N for .svj6m-pxhezd a4f u1 d-v7w(a distance of 50.0 m. What is the work done71z s6 we(fx-d-vpmd4vaju h. 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 const qq2 x+zt,as*tant force of 5500 N for a distance of 50.0 m. What is a2txqq,*t s z+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 force ofp0 e rz22g;pw db/xfd+x5bo)x 5500 N for a distance of 50.0 m. What is the net5bo / rz+pb)2egpxdw0x2x;f d 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 x.phd hqcp32(s*9.dfc:gb zt httu*3$37^{\circ}$ 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 dpzg1- e)2 namjown 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 Sol +*ra jiwe)t)isy88arah in a sled on an icy surface (assume no friction), we)iiwl 8 ro8+j y*t)asith 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 Fig. 6-gay 3)m9 /lmfb1 shows the force versus the object's 9/bmmfg )ay3lposition. 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 dk. wl)ut p z52ywd7gq4irection of the force. The graph in Fig. 6-1 shows the force versus the object's position. g )72zwylqtwdpuk 5.4 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 ink+a7i 4 jwcq;f the direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the worjkfi;cw+4 a7q k 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 the dire g9e,)92 -n, pvtjzlmicw srz,ction of the force. The graph in Fig. 6-1 shows the force versus the object's pos)r zv-c2 mwp9,gj zl9te,,sin ition. 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 (initially at rhlw6g46l1g lza t)lxe h31-mn(s0m iq est) across a 10 m level) hmwl1e(1i64m -hlgxnls3a g6t0z ql surface. What is the final kinetic energy of the cart?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force of 200 N is applied to move a 55-kg cart (initially at rest) *qw0x.dg )ak pyk o/*aacross a 10 m level surface. Wha*g*w d px aoqkk/y0).at 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 sh4dx42i- 6g-ca fou gbpeed of 5.0 m/s. How much work is required to stop thc-gg4- hudoa6f24x bie mass?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If it takes 50 m to stop a car inii:2 fw f:1xhbmwj;94 ptsgq)dtially moving at 25 m/s, what distance is required to stop4g pfq)2j:d1hx ; if:9wstmwb a car moving 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 propels a 10-g dart. It hck.5z -x*l dg.u8gbw is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart lea zw -hx*ubggc..k8 5ldve 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 comp) wcwpagyf,x v ie+(p 75ybyp (++5owponent of 80 N and a vertical component of 60 N.b go(w5ecy 5apy iw+),(f ++wxv7y ppp 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 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 hlx5faz 1j7 ov9ay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the averagexaofj5 7 9zlv1 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 7.00 m above a floouoqzq+t 00x :wr to a height of 13.0 m above the floor. What is the change in gravitw+t xqou0:q0zational 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 /n2 c,-- gbhvqa eg5ytplane is 4.0 m long and rises 2.0 m. If the plane is frictionless, how much work g/e-ba-ctq52h , vngy 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 spw*kz g n5 k(o+)*lgymzring to stretch 2.0 cm. What is thol wyn zkz*k*gm )(5+ge spring 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 )qb:1 ;vkpr j, x*cwlva spring constant of 60 N/m. How much potential energy does it store, wb1*v rc k,wxjlq:pv);hen 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 uncompres(wqv y0y bty.gar 88zg2ps7dz;p ,9bhsed spring with a spring constant of 25 N,r9h gpqpt0dbbg (78 s8.azy2v ;wyyz/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 = ;d t)9;fu fnl( yrzs+r0.20 m to 0.25 m? (Assume the unstretched pornf(+ ;zfr9; dsy lu)tsition 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 compress3qqd qrnzql6r 66-h4ved by 3.0 cm. How much work is requiq4 -hdrrl 63q6nqq vz6red 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 top of a 50-m high.k; r e3sn6 jus pn/vmowe77(z slope. What is the speed of the slier on reaching the bottom of the slopemrj ven / spo7.;6wen zu(37ks? (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 hiagdzg ,ml z7,v 1ik*7ill with an initial speed of 4.0 m/s. Neglecting friction, howzmigl7z,i g vdak1*,7 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. jt-w,1yc :5ep -ys p6et :anefAt the bottom, it has a speed of 9.80tnp:-e ys y 1fjwt:ec pe65,-a 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 abojotxg )2, l y;a97 )y y+ne lltj-lwvw4d9c4xgve the floor, its potential energy exactly equals y ly n ;dl4 joct2e7w,)x+ -twa9ygj4lg9) lvxits 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 o, fzdz5c5nekxb)l6 evvh709level with a kinetic9,bn x57k flzovh0d6ev )cez5 energy 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 kinetic enlu k x ,om5crab2n,9znno. w+)ergy of 220 J. At the highest point in its trajectory, i,nk zuxw5,noc.+a)2mo nrlb 9 ts kinetic energy is 120 J. To what vertical height, relative to its launch point, did it rise?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts from rest at a point 45 m above the bottom of7zr b 7axnpr1:fn(.vg a dip (See Fig. 6-2). Neglec 1ngr:p(.a7n rvbzf7x t 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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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 9tj auwzx 0/.nm/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglejwz t0x.ua n/9ct 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 pza86x woi4;gvp /q x7aoint 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 roller coaster at the top of the next slope, which is 44qzo7a w/a xg6;v xpi85 m above the bottom of the dip?


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78#
 
  What is the minimum speed of the ball at the bottom of itsf/ x ug:)98h ,qxygo(fgth6 xs 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 frooz nd21n/kdwd;* )ggmm the vertical axis and released from rest. What will be itsdd/ dg;wkzn og2* )nm1 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 sp l-x801r8m4kjafyy 3rjm m1lcring wity xyc8alfr104 mkrlj-m3m8j 1h 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/s, slowkl6( a-vlk;gks down her 2000 kg car to stop for a red light. What work is donek;k(a lgl-v k6 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 hori-vg3cmd/(irv)0 :xilv1qaj kzontal surface is 50.0 /cdv x lrq(k):ivmgiv 0-ja13N. If 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 rough, level surface. xx ke6xt7l /fv;6 /+ucz iezr0It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How far will it slid0ecf6x +;kil x67z/ /zvxue tre?

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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 vkn3tr5dx0uc dk)ldi-4r /v * 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 a distance of 10 m, what is the change in its kineticr3/kd0vvnc ixk 5u4ddtr* l-) 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 higx289h2sqxex a c7t t9oh slope. If the work done by frictqtxt92xe 72s9x8ch ao ion 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. The plane is 4.0 0. mtkv4/j)9 ymaxrf y6ks.ky 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 avek4atm yjk6v rkyx0.f.9/y)smrage 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 3ajdeu*kin(7dp:xe ,w,m nfy85e k3aof a plane inclined at 20e above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. Wha8*:ma k , eeeijkn3wd53x(fd,p7 uyant 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 g,5im8d140,rxj 1ds(wzk j /ekp k yhqiround with a velocity of 7.00 m/s. ,hkdsik 01k j5r(jqy,zei4dm8 x 1/wp What 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 runsj x+g 8q;8lq:kmcyv*o up a flight of stairs 10.0-m high,lg:m o 8qykq+cj*8x ;v 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 6e fuo*q0k2.t 7 wjjwzmove an object with a constant velocity of 5.0 m/s. What p7* .j6qtfjz uewo0 2kwower 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 motor that runs for 1.0 hr? wc u8 1roii9xz4bbdli/ 6) 3vk(1 hp = 746 Wi8 kz/irbod lu6 xw3v1ic)94b )

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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 td(r l7:6vlg bhb74vxvzu5xl:he rate of 500 W while riding. How much force does her foot push with when she is traveling at 8.0 v h7 x:b xlzvluvr5:bld7 4g(6m/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 tokv stv 7 (a.+ uoz3i)si1boquyj)b 99x 25 m/s in 7.0 s. What is the average power delivered by the engine? (1(ji u9+)svz.3vb 7xk 9sbtoyoq) uai1 hp = 746 W)

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