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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 ujrk,d4+y9o 7wwm5 yuunits?

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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 moti x:q,(: cinox1.8vxy+rpf ilnqx; yx+on?

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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 again ttio 0d 7 *rru; oy82bq7jstdiu1,/cnst a stationary brick wall, the amount of work you d b27;8s, c1 qjy dioo0nuu/td7*trrt io

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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 mugzii,n.6a6 oj ch workn.66ij, iz oag is being done 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 forward at a constant velocity cayt t8c qn 1p1qdcd70yk(ypd sq.118pgc f+b)zrrying a 10-N object, the amounbdt sy0.t(nqcd py qc11ypdc k81+fp7g18zq)t 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 returne95b7m2w-dkhk* q zb3 xiby cr:d to its original position. If the total weight is 30 N, how much work wi: b bq3 y-r5*h9 kd2cbzwk7xmas 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 objecf3f2eig1jg3w re.vi7 b6 7cout?

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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 done by gravitc; v5 yg2qxkfy;;j u(wy while the ball goes up with the sign of the work done by gravity whiy25c ( fqwxy uk;jvg;;le 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 position9armrvmfw p- c 0h13d0 (F vs. x) graph, representsw0-d 0rra3ch1pvmmf9

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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), lahmh/ q20iw6what represents the work done by the force Fql/im0hhw a 26?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The quantity $\frac{1}{2} \; mv^2$ is

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the net work done on an object is positive, then the o 2vp ni3)hf y3)q;spfg;qe td;bject'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, thfyf 2ipd0hm.nf/:3 dnjy2 k g*zf gq95en 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 obj8c7os6s)/bc paq/zq 3-6g z y(wocpmhect 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 car, and is gvj3za,5)g h7nj ar 0fmoving at twice the speed of the cn7z5fgra) 0g 3,jvahjar. Which statement 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(ti.r; us pdsdlh. ,;z J has half the mass of car K. The kinetic energy of car J, compar;rl s,u ts(; d.ph.zided 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 lt.lt.de zwlg / ;*j9pshtix:7c 9u0 ebounces back with half of its original speed. What is the ratio of the final kinetic energy 9ti9p /lzwue;cld s:7ex h 0*.tgt.lj 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 moving at a speed obu o zp s9s-c w75dkipco3pc-n:q; 5u,nxy;+wf 5 m/s. If both objects h-o sx9 u+;,-ck :py wsdp7;z qu5nwcpboic 5n3ave the same 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 2.0 m/s. A 1.0-ridaa9: ab) 5e oh7jpb 7z2iw/kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater d92ah: )pio5ijbewbdr7 / 7zaaistance 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, andwkprt w) iab9e/;y: *n skid a certain distance on a straight, level road. If you had been traveling twice as f/i 9*enpyb)w: krat ;wast, 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 orbi t:d*r6kby+i lts the Sun in an elliptical orbit. Neglecting any friction effects, what happ br+ltki :6d*yens 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 principl r jhmu+tn+80lxr;qu8x5ly, ke.
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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 po c;cycj w*-8r 9dfohlip 5i-)ztential 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 ren;r4yue26vrfuh* .kz st a height h above the ground. A second object with for;kn hu26zy. frevu*4ur times the mass of the first if released 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 srqh9be4 tvdfa1 g(8kw9u7bv1:s pde7tretch 5.0 cm. If another 0.200-kg mass is added v:f1hbd 79q 9dr e781vuwt as 4p(kbgeto 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 o/0 njo+p4- rnc z(cfggf 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 potwjc0g 4v, iz6 rlz+tr4e-;txmential energy ie z r;,ltxwjm+ cvg6-404ztrU.

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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 m6 u) ;,xymw pv3bk:tha car 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 heavv3. kll6jnfcs5 ypycuveyot((. n)*+y object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hillcly .n3e( .s6 +v*yly5 (u fvk)jopnct. 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 tchc *, vn52vd$m_{1}$ 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 conserd ak z 9r:4m,:j6i: yypfa1ctfvind39vative forces1n6ytc9ai dy jdf,4 ri:f::z9kpmv3 a.
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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 frictionf+na tl67;o 7zf-twb r is present), to the ground below. How does the kinetic energy (K) just before strilbf ttra 6;f+zno7-7wking 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 gains 30 J ofy litat7r0a z6z9on 8. kinetic energy. Do not ignore air resistance. How much gravitational p 9.z0t a 8lt6yi7anrzootential 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 and5)9 m2 u 1nmmc2ojvt lf8fhsx5 loses 30 J of gravitational potential energy. Do not ignore air resi2fc5mft192)nxv5uo jsh 8lm mstance. 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 conserhq.tqa7+08zuzo zt1 0hr8 amrvation 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 ,g;l3nixuay;

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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 gjec:83 , voezunits?

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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 notn h -;2vn0eng ))ferut 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 timgusg +tq:0vc 9 o4wgy4es the work in one-third the time. To do so, yo tyog4w09qcvs:u+ 4g gur 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 acce; j:. amo: g*;+wjrqfiap y,y ,eci7ddleration, the car's engine must

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is lifted vertically 2.0 m and held there. If the obb d8h/m: *bhsxdv: 2xmject weighs 90 N, how much work was done in lifth:8:h/sbxdmx m* d2vbing 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 th a+o62c qki5dj;opz+t g;h :in the air a distance of 1.0 m, at a constant velocity of 0.50;5; oa pdzhioqj+h2+t6 g:tck m/s. 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 t;dco/l5bp :390+ g vn5a/fzswsymh xconstant force of 5500 N for a distance of 50.0 vnflds:t+gwha/3po50 ysm cz59xb / ;m. What is the work 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 5500 N for a distao6cwvi3qa(7ocpb )x6 nce of 50.0 m.6(cai3 7cbvoow6) pxq What 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 upwara,eqayrw89c.prj 5 -fd with a constant force of 5500 N for a distance of 50.0 mwary 5af,jcr9 - eq.8p. What 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 pulled v/4j.iwf- yk9o;2ui 4 kxdxyb 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 slides 8.0 m down a ramp, inclined a6 3k 3,ni( f pas,hd45rhcm jb2nfh2qlt $30^{\circ}$ 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 sis-ls2,v mscr cra9k z+-ter Sarah in a sled on an icy surface (assume no friction), with a force of 60.0 N at an angle -cz9lmra,-r s2vcsk +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. 1:;x qhvw8.gc bv bo3lu/t7 hz The graph in Fig. 6-1 shows the force voxv 3;ghhzbl1/v: quwt 8b 7c.ersus the object's position. 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 direction of 34 8obivpaokc*7 7izythe force. The graph in Fig. 6-1 shows the force versus the object'a cvoyb73z 7p* 8oik4is 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 fornvxj ro*+oy-p2,j w:sce. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the obje,*x2+ojownsy p :rvj-ct 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. mnhu: 88tmy n- The graph in Fig. 6-1 shows the force versus the object's position. Find the wo mnt8-:ymhu n8rk 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 cncps 7+ht3xw 3ky)z7 (initially at rest) across a 10 m level surface. What is the final kinetic energy of the 37cshz+xy3wc k) pnt7cart?

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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 cakuewwh+ r;p 8hj9y.4xg .i 8hjrt (initially at rest) across a 10 m level surface. What is th8e4.hk+;8 j9uxw. hjri gw hype 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.jc ,a(/afb r dzs7)ai:0 m/s. How much work is required to stop the mass(j:a) i bz dsr,a/af7c?

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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 distance i i*a61 f(i *6jdlng)m oc2ulaxs required to stop a car moving at 50 m/s under the same cond61a 2lno 6di lxcjga*m(f)i u*ition?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring-driven dart gun propels a 10-g dart. It is cocked by exer6j78f7 p wyao. xhwcg3ting a force of 20 N over a distance of 5.0 cm. With what speed will g7jx3wf8wh a6oy . 7pcthe 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 d3,tj s hvu;4io/ wom9vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart staw,m;i 94 s3hvod/ojturts 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 the8 lj8j - a5k4uhk kr wy/vdpi+pi+yka*ad-;,x hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. Whi jy j,d/r8*ad;l xku4ypka58kkpi- + hwa+ v-at 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 above aa p1s4ap+p-mo4 fdyc 5 floor to a height of 13.0 m above the floor. What is the change in gr 1 ofp+sdy4 p-a4a5pmcavitational 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 pushed2:sp(u n7 oqxp/y(h ac up an inclined plane. The plane is 4.0 m long and rises 2.0 m. If tn( 2q7:oc sphy/p(xauhe plane is frictionless, how much work was done by the push?

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-kg mass, hung onto a spring, causes the spring to stretch jj:pa ffi6 9b uy(s)*v2.0 cm. What is t: jsb*9ff ia yv)6(ujphe 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/mqa pf n63x*9sd. How much potential energy does it store, when stret 6xqp3d*s fan9ched 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 comp.zcv a:h/l;u cr **bjhress an initially uncompressed spring with a spring constant of 25 uc;/hzc*.:*hlvjb arN/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 requirec6zue: 0lu:/jr: msnyd to stretch a spring of spring constant 40 N/m from x = 0.20 m tou6ey0cz/rn: l :usjm : 0.25 m? (Assume the unstretched position is at x = 0.)

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring with a spring constant of 15 N/m is initially compressev r73+u5g8bnmev +ucgd by 3.0 cm. How much work is required to compress the spring an additional 4.0 cm?eg u +m+5 vub8v3grn7c

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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 frocjpe :yl4dce8r) kdw ,gb.,4em the top of a 50-m high slope. What is the speed of the skier on rea pecr4ejd,wedc)l,: g8 .yb4kching the bottom of the slope? (neglect friction)

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A skier, of mass 40 kg, pushes off the top of a hill with an initial speed of 7 (/*immb u2 llpom7wp4.0 m/s. Neglecting fu2l/ mwloim(* b77p pmriction, 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 frictionleslhqn xegk5( 4.wav- /ys inclined plane. At the bottom, it has a speed of 9.80 m/s. What is w e(.yv -a/nqxglh 45kthe 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 theij s;v5x; fxxuw(yii3. ia2m 3wlql-) floor. When it is 0.70 m above the floor, its potential energy exactly equals its kinetic ex l2 i). x(ifi-5wmxqils3vj;y ;u3awnergy. 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 straig)c4b xbf 5;r)dh4 vyvwra,bk) bg7vn0ht up from ground level with a kinetic energy of 4)0k4vc)nxb7fgd;,vha rv 5bwyb br 4)0 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 energy of 0uak9 moq+rpv( (0gth220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, re(0va0qt+ogp( r9 hu kmlative 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 po* qudaa1im ol *7c ykdjl//to -)vjp09int 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 3*do* 1 9aok/uc l) v/7jy-ldjmqtpai0 0 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 m above the botg(p, 0ygm)z4dgkgj* btom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottog,mjg4 )d0 *bg(pyz kgm 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 po nhgqm(31l:ve int 30 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what qle(g 1h3:nv mwill 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 the ball at the bottom of i n 3v2)wg3mt)cju-iuwts swing (point

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

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80#
 
  难度:2

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 2-kg pendulum of length 50 cm is pulqu3d0e3df we5 led 0.22 m away from the vertical axis and released from rest. What will be its spee0 q3edfew u5d3d 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 uncop 0w- a+t:fjeef-t+ka mpressed horizontal spring with spring constte+je0wkt -f ap+ a-f:ant 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, slu)6 ozyh-m2bx)yl3n mows down her 2000 kg car to stop for a red light. What work is6 yubz3 lmy)x h2mn-)o 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 fj j+z6.id osw:orce between a 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distan.j s :6zd+owjice 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, lekgaz*h4(.h k dy7(j d5t j(zewvel surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How far wit yah .gjz4wd5(dkz k7e((j*hll 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 horizonta uvenp,8il 5vm4nv k.7lly to a 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 distanceim4veuv,nlk8 pn.5 v7 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 rxisv la26ubt3byw *i0p/b.9 from the top of a 50-m high slope. If the work done b .a39b/ ty6 l0ubsixi p2wrb*vy 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 pev (ui+/rn9z up an inclined plane. The plane is 4.0 m long and rises 2.0 m. It requires 3200 J of work 9u e/(+vi pnrzto get the box to the top of the plane. What was the magnitude of the average friction force on the box?

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 2.0-kg mass is released from rest at the top of a plane inclined at 20e ab2qj w:zit ; m5tbf2;igove horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed of the g ftwi :t;zq;m2jb2i5mass 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 :sl;lw z)r l6*m ph3 rnp,5jcdof 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air friction acts on it as it fhld6*,m )s5; 3ljwnpl pr zrc:alls?

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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 (tb *4h9go(e8khslua a flight of stairs 10.0-mb(hel aguos84(9k *h t 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 needed ti i,bh -i*quf*o move an object with a constant velocity of 5.0 m/s. What power must be delivered to the object byi *iuif,b-h*q 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 usweto, 9p3u+ 9 )zfentied by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 ez ,ft3w ep9t )i9un+oW)

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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 t, ,l;ykhx*ip4hj rs;xr1px 9 nhe rate of 500 W while riding. How much force does her foot push with when she ik*s9xxr; p liy,4h,hprj1;nx s 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 from 0 to 25 m/s in 7.0 s. What imhr7l 60 .dprga)4 r*i neqopxht;e4+s the average power delivered by the engine? (1 hp = p )mreaqd7p;.*gi40 o lxnrt6 4reh+h746 W)

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