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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 exr0s+ qpwi,b5uo -mzllj .p9 /tpressed 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 i2tw:;lza1l ifj9e.kwu i i(3 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 amount of work2. u7; awfwjoe you dow u2w o.fae;j7

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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 verticar c3h pjg .0ag:di;y8elly and is being held there. How much work is being done in holding thj 83hpgi0c.d:; gyea re 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 forw15s;om0jj 7jf8av- wfgh 9st0lll5c uard at a constant velocity carrying a 10-N object, the amount of work you j8ousc 00vm;thj75f lgsa1wf- 95llj 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 9 8aaxg9k gna*lifted vertically 3.0 m then returned to its original position. If the total weight is 30 N, how much worka9gan8k9*xga 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 objec1s 5i0 i7 k5ckc9 hyqrt8 xs2nmgv5a,ft?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You throw a ball straight up. Compare the sign of the work doner-ayw+u1ez 3u by gravity while the ball goes1auy+u3-wre z up with the sign of the work done by gravity while it goes down.

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The area under the curve, on a Force versus position (F vs. x) graph, retk9q9m3f 6: t9cvp edxpresentsdcp9t36 vemktq f 9:9x

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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 th7c 4-fgj t;hrae work done by the tc-7 a4gfjh;r 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, the0 d9ot f+ az n70buy3us9hp+bon 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 obja.gl825dcmz4 q)ks jm* zgdorq75ma 7ect 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 zero, then the ojvciif7* za(6;27323 j h c lr.qqzsyrr8wrijbject'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 thgz-rg8sp*vvf* t6 j (ze speed of the car. Which statement is f*j trs(8-pvvg*zzg 6 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 l/up(hm;t qo6 c/+wzr the mass of car K. The kineqr;u+pw/zh/ l6o cm(ttic 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 back z42mhr lmfu.6 with half of its original speed. What is the ratio of the final kinetic energy to the initial kin. hr6fmlz m42uetic 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/se841 9r6fx xd ominw,qw:kf4m 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 mass wdw4 fnxm9,m r:xq1i e6f4o8k?

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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 with sd. x ,c7thyaar/tzc;kz0u6 b 6peed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distanuytd,x;.z /z6rha70b kacct6ce 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, an16geq 7, 8xdgy/nqdg sd skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the1 esggyq, 6/dndq g87x 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 a v0uy 2z+jpjk-x;y+ dv25 ftkhny friction effects, what happens to the plane v5y+2j-t;x0y fvkud k 2h+zpjt'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 prin9q e x5kkgh ;yfp6t3w+ciple.
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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 potential energoo +4fu o5s5dmy?

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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 grounvf/cecu+g 6v7ql3wq4 d. A second object with four times the mass of the first if released from the same height. The/u l 6+wv3gqfvcec7q4 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 5.0 cm. If 1jo 5ri.)r wkg.wa5xxanother 0.200-kg mass is added to the spring, the potential ener)xri xwgo5.. jk5rw a1gy 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 systee 3w9ajxx : ,;c/egoiem

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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 potentijul8yjl0tnr k7/m p4.i*k 6gkal enerji/4k 6lt8 *m ygrk7pn0lj.kugy 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 a h yfc(4h5h pwo1;ei s9aill.

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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 ob4d l dj6qegc(3ject are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rised 4jeld3g qc6(s 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 :m nu f ru7fju;hpk9a13o/m:6f6 vnbp$m_{1}$ 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 mcuhke khug. 5b.79. gmechanical energy for conservative forces.7 5ggh9c um. .khkeu.b
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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,a;56-vlwl 2xd x vwl8gbqfye,hk 9 yk*(unv-, through the air (air friction is present), to the ground below.kv-l5 n*yl -u6, 8,;g wlbvx9fed w2hvxqa(k y 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 gc* c6+hou7kdf dbm,8 vains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential e +7cd,8kofuhdcb v6m*nergy 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 gravitation.q*dn j:abf 1r1dny -aal potential energy. Do not ignore air resistance. How much kinetic energy did the byd.ajqr1n-d a:f* nb1 all gain?

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37#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the law of conservation of energbv gi0, -8psjapj o(hnzhx 6,* r(o4pzy.
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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 ispqzb9n )-/i/gv5rqaq0o (kh j

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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 un2xo i6gjfh0b0ge42kh its?

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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 unit5 )t72h t xujfoh,9fzte9v 8t0ur, ywu 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 ougrlri)w + +5z i9q/)zs2uhhw(j8 sedid 3 times the work in one-third the time. To do so, your powerzrl8 9 hwr)o s+w (2/qis+u) euhgiz5j 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 acceleration, the 0n(xlelsd8.u 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 weighs 9*3qk oqwbaj, p,,-fgb 4cfck10 N, how much work was done oca,*-qfbbg 3,kqk cjfpw,41 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, 0b4l 2b(ylpv +ln+ :mldk*ytt at a constant velocity of 0.50 m/s. tll2 (ld tbnyb ++ym: *lv0kp4 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 ajij13kk(0 xiuqi p19m constant force of 5500 N for a distance of 50.0 m. What is the work done by the 5500 Nk1 q0mu 3i(k x1jj9pii force?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled upward with a constant force of 5z w-op07rmicdq)8m)3 5uhwn a500 N for a distance of 50.0 m. What is the work done byi)-) 0 cuw hzormwqdm387n5pa 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 of 5500 N for azw8r8),4a mrgd-,i lku3w ljx distance of 50.0 m. What x)mj -k,d u,wl8wa84rirl 3gzis the net 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 alongmt1b7x/9r-bmr1 h sml 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 68k zez:;hk mya 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 o4k( q6y r;i2qsnz+ 9hsx:*t 3nw by7anuwhq .sister Sarah in a sled on an icy surface (assume no friction), nqzyaq:h4 +;h.bx qntwy3(nwo 9 6k s7s ui2*rwith 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. Th+ 48cbqupfb h;t53wx ne graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the o4uxq 3phbf+wn 8tb5 c;bject 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 direction of the force.g pfiqz( eiu4a6(3:ckdr *n (t:s(eui The graph in Fig. 6-1 shows the force versus th (ifgds(*e aiu:r c:t 6k3(nzupeq4(ie 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 direction of the force. odwsh8 (bfh-o+ vuw6 3The graph in Fig. 6-1 shows thvs(8bhow36 wuf o dh-+e force versus the object'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 object in the direction of the force. The graph qk by;z2;4 kwo,,j cyhin Fig. 6-1 shows the force versus the object's position. Find the work done ykq bh,;o w;jzyk42,c 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 (initiallywlzq4,3hkhwe kzc+y. s bb0uhy, .0g9 at rest) across a 10 m level surface. What is the final kwb4 qhh+ lk.w ugzb0 9,3k,.yc 0zesyhinetic 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 card (nu em(c/-st1z, xydhaa72+py lu3tt (initially at rest) across a 10 m level surface. What is the f,1( h-ndtsm2 za(x dy eu ca73l/upy+tinal 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/iu3qh h2w wc+;-)iehqs. How much work is required to stop the mh3 h2) chui+q ;qi-ewwass?

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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 dist:)j gj:p mjbg7ance is required to stop ajjb7)gm: jg p: 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 is c;el k1vx))c nhocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assu;h))1cx nlkev ming 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 of 80 N and a vertdxq0zoc:6n c9r(mxq /ical component of 60 Nr 0o6x c/dz:(nxm9qqc. 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,fze)k 2/,:p w.n f7 :rakh*s otbrl6ltufk 5p hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm befor65 ,f7wpl a*t),ur:s /:efz orptnkkb hl. k2fe stopping. What is the average stopping force acting on the arrow?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 15.0-kg object is moved from a height of 7.00 m ljok6 t)c;:y5h +yhs 40 mzarwabove a floor to a height of 13.0 m above the floor. What is the change i5sa+j6 kz;4yl c:)owr yh0htm n 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 m long anmxl6zg1qk-k n3 p *c)kd rises 2.0 m. If the plane is frictionless, ho kmnk*6l1kzcxg 3q -p)w 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. ugp.p npac s rkh/+(k06 4j4dyWhat is the spr/(hr.4 pp6+kdga0cs n ujyp4king 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 60 Ni1 ryns amll7xg7ao *can/ *eqc+7n;//m. How much potential energy does it stc71no l;xlai gn+c7aq y//rans*e7m*ore, 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 initq+ j 6z;ah6xmjially uncompressed spring with a spring; jh6+m6qx zja constant of 25 N/m by 10 cm.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What work is required to stretch a spring of spring constant 40 N/m from x = 0.28 fol;nqk edmxemv 7,np, 1br9si14c (0 m to 0mnck7silpqx (dfve 8m;n,9e 1o1rb, 4 .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 isjcgic h (pl-0co a)(;a initially compressed by 3.0 cm. How much work is required to cog ci (a )jlpc(h0oc-;ampress 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 fromc 74cooylng;6 p8u s5f the top of a 50-m high slope. What is the speed of the slier on reaching the bottom of the slope? (Nef58 c;c oy6lnopu4sg7glect 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 )mln-w0du5ef *ex8uz/sdap.off the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be mf 5 wdx.u8 sd*0z)/nuaml-peeoving 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, it 7uz;x euoai /2has a speed of 9.80 m/s. What is the vertical he;2e7x/ oaiu zuight 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 floor, its potene 0 eqm9n o6aelc*+ci0tial energy exactly equals its kin6m0noe0c e+*c9ieql aetic energy. How fast is it moving?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A toy rocket, weighing 10 N, blasts straight up from ground level with a kin 0-uxg0 9q8lrn2 mbgwmetic energy of 40 J. At th0lu-mxrb08 m2 nwg9gq e 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 ener)2zn( ev6 tjusu*h g8wgy of 220 J. At the highest point in its trajectory, its kinetic energy is 12snw 6)u*gth z2( 8uevj0 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 m0hjo2b*87e;ie7w ilhni.fs :vzt zp/ 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 nexfii obz/wz0tl:*7h pi 78jehv2.esn ;t 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 mdki/qbgjjoy s* d: smylf9:*6zt+*6n above the bottom of a dip (See Fig. 6-2). Neglect *yo*j6 kd9m+6 jibsyl qzf: :dg*t/sn 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 bottom of a dip with a speed o8f h;p8xo r,2cgivq7 bf 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller c h2fg; iq 7cr,povxb88oaster 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 nk64u/p,gr)/mm b qn x 1nj(jpat the bottom of its swing (point

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A:2.2 m/s

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80#
 
  难度:2

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pendulum of length 50 cm is pulled 30 cm away f2e(*g3- pokwvvj je d2rom the vertical axis and released from rest. What will be iwvgep22*vod ejj ( k3-ts 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 uncompressedlw9qa-b,: ty /pnde9v horizontal spring with spring ca,q-9b:wvpy l/ n de9tonstant 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 7tm h-9u-ppuomj4wp8/s, slows down her 2000 kg car to stop for a red light. What wtp j8omwh --pm4u7 9puork is done by the friction force against the wheels?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The kinetic friction force between a 64ioc*d:hsqa-eo a r2) 0.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distanc)oaoh:r 2 d*ais4e-c qe 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 kinetic (xwdw85zkk *s0 , kjxoenergy. The friction force on it is a c5kdk x(0*sk, wzox8wj onstant 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 horizo)hxag :b(77hq f-jns/mee9vo ntally to a 2.0-kg mass on a level surface. The coefficient of kinetic friction between the mass xbh7e7hqm)s(onae9 /-vfgj: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 the wo*k 5a1 wdyxn ; hlsemp*fcl0(1rk done bcp l(dly1;ewmx0a1 ns**f5 kh y 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 pushed up an inclij el5d3l6ki3bb9uaa7 ned plane. 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 ol9j7di53 a6l3b kuebaf 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 the top of a plane inclined ah1 nc6to d)q,it 20e above horizontal. The coefficient of 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 tq)o, d6inht1c he 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 ground wf7zm2( r 1ot4iror8plith a velocity of 7.00 m/s. What average force of air friction acts on it as it fall lir1orptf m(o42rz7 8s?

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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(s 7(0pdrof*xm uv+ak up a flight of stairs 10.0-m highxpvu f7(sor(k0a m+ d*, 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 withpd(su0g o 25mf vssj.; a constant velocity of 5.0 m/s. What power must be d d g;2v jpmus50fss.(oelivered 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 runo6kqvedr:8k;,cx 7yn s for 1.0 hr? (1 hp x kk6n8 vyc:;eor,7 qd= 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 rb1ce9 b3hmzzee/h ,m-xp8 p/eiding. How much force does her foot push with when she is traveling at 8m, b9be- phec zxz/3emhe18/p.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 in 7.0 s. What is the average powergs2,+t kbsue. delivered by the engine? (1 hp = 74 gkb,s2u+st.e 6 W)

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