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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 woc q938zswaf cc-i k/t5rk expressed in SI units?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Can work be done on a system if there is no motion /;w l *8 xuj; 6tekjut+-kuwuzgxl.3e?

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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 wal)1jlknpbl3moe *-cr.g3 -mba l, the amount of work you cnjg r * a--.o1mbkb3m3)lpeldo

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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 anj tfp5q5dqu0n: a7ss)l8pf1vq tz( y2d is being held there. How much work is being ajzf)s dv 0f2q5s :pp1t87t nq5qy(ludone in holding the box in this position?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you walk 5.0 m horizontally fu8da j8 4 lsxdk/-0vjsorward at a constant velocity carrying a 10-N object, the x0/8uds av4 s k-jdl8jamount 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 3.0d5+ burzgk :uoqjmw507 + ib*v m then returned to its original posb0 5wj7 o q+uku*+ mgb:5vrizdition. If the total 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 acy nk0//bx4cdx+ drk1/3sx yzs ting 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 sig 7jv :j31zbvx h,nd(4wid fl-on of the work done by gravity while the ball goes up with the sign of the work done v ,l i1dn34 -(jxw:7bohfz vdjby 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 pbexy,u:ul 4o0ed o l; ks0p(7qosition (F vs. x) graph, represents(o;xk:u oq bu ep40esl0y7 l,d

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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.-l3giio 3oat l2sze9j j k/7t+ x), what represents the work done by the fot3otli7+e z/9ga2ls-kijj o3 rce 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 objecw-gu uukoh ,8i: 1me5et 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 the object's kinetic encp99u2 gds ux(ergy

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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 a1*j y6d.*o7ox08f yvte uduvkn object is 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 d( lnrr/(si md4o 3jw5ur kff/*/lg; lcar, and is moving at twice the speed of the car. Which statement is4fw/f5u/dlj *sgd(3lnkim( r r ro;/l 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 haq1u0,b0p y4yqhn kuthz k. ynv z62:g9lf the mass of car K. The kinetic energy hq1u0nnz492v:tp 06,.kby kzq yghuy 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 witol(ot x61ssn)ub)y(n/9 tq bih half of its original speed. What is the ratio of the final kinetic energy to the initio st 91qo/(n)luns bx(bt )i6yal 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 moving at a speed ovmmr1j15xz jl.) cc9gf 5 m/s. If both objects have the s 9cmrz1v5 x.gjl)1c jmame kinetic energy, what is the ratio of the brick's mass to the rock's mass?

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-kg mass is moving with speed a 0ag-r;8ejkn2.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force,rg ;8ajken0-a 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 inv+myadcq+.uip 4) m,k a panic, and skid a certain distance on a straight, level road. If you had been traveling tam+m)4,c.qk+u vdipy wice 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 ellin,:f vv6g9rwsptical orbit. Neglecting any friction effects,:6n,fv vwg9 rs what happens to the planet's kinetic energy?

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22#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State the work-energy princip p*xr*+ad fz,jle.
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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 systeod35r6;px jan m 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 *ob3 ae8mmr)w.;hn- ( x qtjhyheight h above the ground. A second object with four times the mass of the first if release .h (ye;otn bxh) r*j83mawm-qd from the same height. The potential energy of the second object compared to the first is

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 0.200-kg mass attached to the end of a spring causes it to stretch 5.0 cm8r g/o rp9kw2) ale52bu/ohcb6jmq(r . If another 0.200-kg mass is add2b/h jelrgrqo29k6m rbow5a / )8uc p(ed to the spring, the potential energy of the spring will be

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The total mechanical energy obdtp 3jo8 z1(m (qjtj /,7cwxpf 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. vr0bfmq hk 21lt i 2;nxl o1eo5xf4r0) Compare its kinetic energy K, to its potential energy h1ltq04)2 xfof2meovb 1 lik0n;r5x rU.

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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 jzd/h3 qovm:,driving up a hill.

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A lightweight object and a very heavy objeyl(cv+cev9 tgh 7i(13ueme+ fct are sliding with equal speeds along a level frictionless sciv cee (h(73t9y+1ufle mvg+urface. 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 uv :ezxw h+i7u ;9kxl-$m_{1}$ 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 e4gfy(sc,o t qmu 6t)9dnergy for conservative forces. ftmtdys4,c 9 6q(u)og
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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, throughr;89nlue b t 1l3.( p a+0:xdfccvqoth 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 the buil3 l 1a8pubxn;r9c 0+fthev cl:qo.d(tding?

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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 gai7bhiulnw)f0j7g ; q-au mflm rj/(3+lns 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential energy did the ball los+ l3g/frlhaj0w(7n qf);ji m- uu7blme?

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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 37z4 rtld: /ukm0 J of gravitational potential energy. Do not igno dt m/u7k4z:rlre air 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 conservation of energyq6i mn(tx.v 898sqyi +5bzhbz.
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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 isv ttnrbl x 3rb4v5e91/.co zq3

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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 expresbppa394mp 5)xpkvei6 sed 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, wh.il+kk8 2dah7z 4nr0 3 vgsd5ve 2uauvich is not 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 did 3 times the work in one-third t3oq- 87cpk huahe time. To do so, your power ou 7h8p3q cuo-katput 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 car's engine mstn 2nqk+gy7.ust

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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 5up ps9zi/aw+there. If the object weighs 90 N, how much work ww 9asu/pz i5+pas done 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 pfnq1pd/9:qr w6/sxw 1.0 m, at a constant velocity of 0.50 m/s. w9 pp6d /nq:/r1qwxfs 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 constantmi wqe8am 5pu 4*u.ag) force of 5500 N for a distance of 50.0 m. What is the gwieau ma5qp4m8* .)uwork done by the 5500 N force?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 500-kg elevator is pulled upward with a constant force of 5waq)fg mc6d22xl7(.qykc b2a500 N for a distance of 50.0 m. What f6cak2w.mg xq(c7l2ayd2bq )is 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 of 5500 N fo)8 8wus)- rcvut*k vqer a distance of 50.0 m. Whak8 rtvw-) uecqu sv8*)t is 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 pulledkp sdi3.i9bv; 6.0 m up along 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 slidef-pour0wc;e. s 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 ik x 9ym ;mpe8rr((84,krujsm in a sled on an icy surface (assume no friction), with a force of 60.0 N at an(mrpkku xm,j4eism(8 ; rry98 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 fo;9sipm/os8u tx u((iuytg9 1xrce. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 0 to 2.0 m. x o8(1sy;u9tixu ptus/m9i (g


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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. The graph in Fig. 6-1 sh3u r3;zn2 (s d)izphfwows the force versus the object's position. Find the work done when the object moves from 2.0 to 4.p whrz2 duz f3)n(;is30 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 fj9ju9t yitl4 ;orce. The graph in Fig. 6-1 shows the force versus the object's position. Find j ;u9ity9j 4tlthe 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.ope1 fnto )8sw9i7zl9 The graph in Fig. 6-1 shows the force versus the object's position. Findoo pe78n l9 s1w9fzit) 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 (wpcjzm01z 2 y1i0e4ominitially at rest) across a 1 j0y 4ec0mzo1w2ipz1m 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 (initial*xxfg fzltyna) :hqhee - .qnkw7er58)yn889ly at rest) acros8entq9 :q -8hxhy ryw ex f)fe8an 7z5glk.*)ns 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 8y9nj.v 3wh i+/ahcd tgc5-wbmuch work is required to stop t/w5- 9yb3v+8.ac h wjngcitdhhe 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 aad .8 f)a*6g/jawkgv,kfl m h9p93oy initially moving at 25 m/s, what distance is required to stop a car moving at 50 m/s under the same conditm v 6g3)okpa/aj9,lk.h*af98dawgy f ion?

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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 cock)n;.z; vemzpb ed by exerting a force of 20 N over a distance of 5.0 cm. With what speed m zvnp;;)e. bzwill the dart leave the gun, assuming the spring has negligible mass?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 100-N force has a horizontal component of 80 N and a vertical compon i nvn9-:4c8eiivnu52 :ykmh kent of 60 N. The force is applied to a boxv8n54 nuyeni cmk:9- h 2ivi:k 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 hay, striking the hz;9w8+j: oo:n shzcwkay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force acting on towjsz9c:zw : ;8 kohn+he 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 heizr6;bpz *kpl:u 9z hk)ght of 7.00 m above a floor to a height of 13.0 m above the floor. What is the change in gravi ;ku69kpz)zph *:r zbltational 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 mgobqb6 1ia 95jfb4v3 and rises 2.0 m. If the plane is frictionless,1jog6mf ib9a5b4qb3 v 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 * x 6+w* frjc.+m ,j4ity3(fxkg ip6a jj-ogopcm. What is thekfx o *y4+ *gwi fim6x.to cgj+p6jpaj,(rj-3 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 a spring constant of 60 N/9:b v* sog3kbtm. How much potential energy does it store, when stretched by 19g*o tbkbvs3: .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 736 f5ba3( b.dvx-gmi *u ve;twwpvhpto compress an initially uncompressed spring with a spring constant opt-6 e3.ba ghx7m3d;vwuw fv*vpi(5b f 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 4u+9 ;fa7bsivninz:r ,0 N/m from x = 0.20 m to 0.25 m? (As;, :sb7vaizun in+9fr sume 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 comph7 lq.x 5qxr9 9*tipyssp4*j qressed by 3.0 cm. How much work is required to compress the spring an additional 4.0h *5y9s49p pq lj7*tx .sqiqrx 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 slope. Wha1p nd 5-jiws 86de+g2et/lpdpt is the speed of the slier on reaching j d1/t+ np2 -5 8diepdpeg6lwsthe 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)+ yc c*v,grliw)e-n +fp( iys hill with an initial speed of 4.0 m/s. Neglecting frre),*li p-)nvyywic(+f g+ csiction, 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 tu l*;cu8*sh3sku ml, che bottom, it has a spehcm8;s uc,ls*3u k*l ued 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 is2r:c7hey73 fhqnysi7 )ea r-o ;m k2tr 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How fast is it movaryyq 2h i mck7s72fr )th3-7e;nor: eing?

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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, b dow8gw1p5cf9lasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mecw81goc d9f5pw hanical 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 kinetisz,+0xtk z2p -i3m iksc energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, tmxi si-kk0,3zpsz 2+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 -a *bxdm gmn62xn.k 05mykgz,c n-e4bsdtr1(45 m above the bottom of a dip (See Fig. (zbyb4x 5tn6mm a0 dnnd kx *1ecg, s2mg-rk-.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 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 ath q+u(sdh6ph2boq1k n8.c *bh a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the rolh(u+hhc 6qo.1nh* 8bpqbd ks2 ler 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 abo 1axvp:3om dh4ve the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what wilh: x o1mvp34dal be the speed of the roller coaster at the top of the next slope, which is 45 m above the bottom of the dip?


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78#
 
  What is the minimum speed of thepus 2a8bkk4,/j1 u5/obqumqy ball 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 6gov +ty l ;m(tl/vsk0is pulled 30 cm away from the vertical axis and released/t y6gm ol0vltk;+s(v from rest. What will be its speed at the bottom of its swing?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1500-kg car moving at 25 m/s hits an initially uncompressed horizontal spbq3*g/l a+qwz9 gt1n hring with splh/ 9a1g3 b+wgn*tqqzring 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 lrp)c /gx9kb 6m/s, slows down her 2000 kg car to stop for a red light.6 g/9bcr)p xlk What work 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 foy paok5)h5 jezb1 q7f5rce between a 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25beyzh55p7)k j51 aqof.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, levpr5 ao9 l5oi8nel surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. Howar p 5l5onoi89 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-m, gvuta2qf)k, a0 xw4kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. 2a4f)qkug 0mx t vaw,,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 ft9p+f m .6uiperom rest from the top of a 50-m high slope. If the work done by fipe+.9mp ut6 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 inclined plane. The plane is 4.0 m long an)5j .y)nh oijvo ;r99igb7w,vx adyc+d rises 2.0 m. It requires 3200 J of work to get th 5yoa7v,hvo y+.dr9)cgijj 9wn )ix;be 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 the top of wp-l43i*wgyqhy-d rj03 c/kma plane inclined at 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 the p3 d-c03 y4hk /p-*wmrglqwjyilane?

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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 with c.ge::jc 4dbn a velocity of 7.00 m/s. What average force of air friction acts4j: .ng:bc ecd 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 a flight of stair+n *n*u qvcditxk 4v7.s 10.0-k4xud.*qn + *nvitvc7 m high, 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 needes a0kquc5z8f9xtt* a:q u4f v+a*oso ;d to move an object with a constant velocity of 5.0 m/s. What pows;cqxft8 ozovu0a*ak9t:fu * s54 qa+er 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)ba4f6 namjo2c0*i apl5czz/ for 1.0 hr? (1 hp = 746 znflcp zc m4*i05aa )2o6a j/bW)

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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 riding. How mucu17 j2 ntrga+wdut ,:gh force does her foot push with when she is travtu:t7 dg jag,n+u2 rw1eling at 8.0 m/s?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. What is the average po7bbkg3 2vix84hy2qsh wer delivered by7y x2i2kbqgs8h3v h4b the engine? (1 hp = 746 W)

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