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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 9s-in6 xtxd*ob2rr ei62pst4zz0h 3b 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 theref x7/pd/(fsa v d a-h)+zfw,qp 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 againstb 0c/ 5xfd34l d8rpzpj a stationary brick wall, the amount of work yo8 /5b4f30zxdldpcprju do

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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 wur18z( 0cymm vb ja0.2.0 m vertically and is being held there. How much work is being done ijywmm b 0r. vczau10(8n 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 carrying a 10-N ot*xdy.jplr:zh-e wi4.n 08oi bject, the .40dz eitxw:op l hjn8.-yri*amount of work you do is

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A container of water is lifted vertically 3.0 m then retuaj4d:vhb mp,sb 5 ja12rned to its original position. If th 14,p 5bsv2hada:jj mbe 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 ahm,2njlzjb; h /0 yky/dyl v86cting 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 sign of the work done b0yo rd4 pu3u;muo.goy,n)8bd y gravity while the ball goes up with the sign or )pnb, 8oo 34;ddu ygym.u0ouf 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 versg re;zw6z +7aqz.d/b5p-u iypus position (F vs. x) graph, represents rg 7q-pi.;zwep5yz z/ 6+bdua

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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 thev0ly l96 wcoo s+xb:m, work done by tho,ls 6vlxc9wo0y :+ mbe 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, then the object's kine ( rgkpgsh;s1 l4uc,* hzlqq/u n9zv4;tic 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 qo1zc:(ggh9w 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 object's kinetic en8a+4alhlm)n2i k0ik zyu. e+wu .hes3 ergy

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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 mu h51qpod-wta3t)0ul9a /xf uklk5m/tch as a car, and is moving at twice the speed of the car. Whi 3-mx/ /w)uk ktdtth1 9pfqo5l5aa0 luch 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 0+-mzk56wbiuo+ k d75,nflw4frd rlh car J has half the mass of car K. The kinetic e+0d-fl b ofhzu,wnrk7l6m di5+ kr4 w5nergy 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 ant-tcen td d57l2)kx(-i ex -ind bounces back with half of its original speed. What is th-) el e-xt5(k nii2 ntt-xddc7e ratio of the final kinetic energy 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 h95g;f/lqmh2nv czo; kjpa- *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 29*- fpk;v5 o/jacnmgh ;qlz hthe 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 2n;)m i;tlbplo2j qz91w+t /pe.0 m/s. A 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter np1 ej9ll/m b)zt+2;t iw pq;othe same constant braking force, and are brought to rest. Which object travels the greater distance before stopping?

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You slam on the brakes of your car in a panic, andee: ibf4-p6l1g xl 5uw skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skgl ipexw 5u:4-61e lbfidded, 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-pn; 4ifwx b4qny friction effects, 4-bi4x;n wqfpwhat 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 principl6zgiiw , h)si1e.
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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 systemkf3zb gaxe4 l )6kc/(np9g,ll 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 t2,wf9.mf vy 7z-inh.rvbys2ftc 0ne;he ground. A second object with four times the mass of the finy yrc;.h9-702 v fmsnzv. i,ffwetb2rst 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 stretch 5.0 cmc8e.,gn3z st o. If another 0.200-kg mass is added to the spring, the potentials,n.8tecg3z o 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 of a saqv:; oyga b6y/0ujj z3azx4-ystem

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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 potential g 1uwltx;q8w)energy 8xqu;g1 wlt)wU.

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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 dpo1g shf ;o+ uws0td,p2 mhea40hx)vl3 ,7izb riving 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 hea es16m ob auxk*ft/ 3/x)o7mtuvy object are sliding with equal speeds along a level frictionless surface. They both slide up the same fr k)otu3stb/1 7mme6oxua xf*/ ictionless 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 ,s,agw3j;xg:elw, x l+fi0je$m_{1}$ 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 ene,0mex ;u:z6egnv(i oxrgy for conservative forces0,zm;v:gee(uxi 6 nox.
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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 frtsx3(y p9fxf7e.dlbsn-u8* ehn kr, :iction is present), to the ground below. How does the kinetic energy (K) just before strikinx7nrsxfs3(* f dh.uebtn: - kpe8,ly9g 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 of kin 0or 9se3kxbz(5dkq ptni ;k-:etic energy. Do not ignore air resistance. How much gravitational potential energy did the ball loe :;nok (krq-z5tp9sd3ik0xb se?

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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 lose)h:h;o n7 pn8.iu uzfks 30 J of gravitational potential energy. Do not ignore ai: .uh;o)kh7 uizfn8 npr 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 enerr5 tdq2 9vqz8sgy.
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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 b7al-f 8hgcv+fddy)k* jjik5 -mg9-x

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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 dn-m fp8*xche omqw(on/+ 1n8units?

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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 9ylmn1an nyn3d tvw4 *ea 9:1tnot 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 the timeh r )2metnt1gzw ))e4p y5rmn+. To do so,)h5)t ) nrmteme4n 2z wyp+g1r your power output must have been

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  To accelerate your car at a constant acceleration, the car's engine k (u9d: : i,f2i9tbz;t ckkvqdmust

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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 weigh:q m,eupn qp3 kv0:5egs 90 N, how much work waskpn qqme:e p:,5 3guv0 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 1.0 m, at a constant vecs os( z ,nsf2df5/5xalocity of 0.50 m/s. What insx/ f5zd5as2 f(o s,cs 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 u i8/5dj tlxhq t*(2k4*m3 ajmux:tzulpward with a constant force of 5500 N for a distance of 50.0 m. What is the/lm 4(kix2z*85qjlj m uat:xthtd u *3 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 forn*mm,hcri. (6y4- zj8hslqaz a distance of 50.0 m. What is the work done byhsah. i-m8zmz4r* q( nc,6j ly 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 constar: . nyvoh;xy)nt force of 5500 N for a distance yy). hoxrvn ;:of 50.0 m. 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 6.0 m up along a 0/bp369 pvhnwouq)dg t s3 5id$37^{\circ}$ 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 8.0sp8q o +m4)s4ya8zwz p m down a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Matthew pulls his little sister Sarah in a sled on an icy surfadte 9cts1 91ikce (assume no friction), with a 1 1t9ticdek9sforce 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 6rnomxq vik4sl5 g06 hh( o01uthe force. The graph in Fig. 6-1 shows the force versu1(ho65ri4 gkn xlsoqv 6mh00us 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 direltjtew47d0 zue7/( :g nd(nh+6qwvdection of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object moves from 2.0 to 4.0d n(e7 e wh0dn6/+ uwz(7tl4dtgqj: ev 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. Td:*+eetshd6tvr vz9ib7( l) uhe graph in Fig. 6-1 shows the force versus the object's position. Find the work done wh eevvb)i9st l(7hdr6+t:zdu *en 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 dv4 gb79id klbo3+d3neirection of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work done when the object mo 3nbi7dvoe+dk bl43g9 ves 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 dwx;dm:r t*x 0d7vj fjpvc, 3:N is applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final kinetic energy odmdct:fvv,wj p7:*x30x rjd; f 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 Nv1*(:qo-kxv)s a 3cmpbr :mne is applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final sp: v( c)exop:sqv3 -kam1*nrb meed 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. Hoot 5zxvpgb /;8w much work is required to stop t 5g;/v 8xtzobphe 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 initially moving at 6wf3,tahaiq +iw1 :bb 25 m/s, what distance is required to stop a a ,if+ bthb:q3wi 6wa1car 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 cocp 07oehbc2 g0gked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, ass72co0hb e0g pguming 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 componenrlo. j4 s0nq0ut of 60 N. The force is applied to a box which rests on a level fric4so. r 0nju0lqtionless 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 horizx *zc /3kxvsgw-5fua:unt9e- ontally into a bale of hay, striking the hay -uxc-vf/9 ng3ae x 5s*:kzwutwith a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force acting on the arrow?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 15.0-kg object is moved from a height of 7- ;evn,:j isii5gecez jl); 9x.00 m above a floor to a height of 13.0 m above the floor. W ;:jxisvn-)ze,i5e ;9eijcl g hat is the change in 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 sdzvfo/ ;*3 rkis 4.0 m long and rises 2.0 m. If the plas /*r zv3kdof;ne 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 spr dh81vg/) otdnr0(*zfmh5k o /0uvdt king to stretch 2.0 cm. What is the spring 0 8/hfht/*) mt koz0o5d(un1g vvrddkconstant?

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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/m. Hoxdmhr).t:77/y lwl sgw much potential energy does it store, when stretched by 1.h.xr tgw ms7)d:7ll /y0 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 uncompressed spri lt37 pt *c:af,fv,y wvv-gck/ng with a spring constant of 25 Nvw:vy 3*gff-k pv/l,,c7cat t /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 xvw(n( 1o nv+st = 0.20 m to 0.25 m? (Assume the unstretched position is t(w+s (n1v onvat 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 initial00nf, tvht+rwv hubp9 oj( uu*h(;si;ly compressed by 3.0 cm. How much work is required to co hhrvb*uti t u0+ wsu0phn(f9jo(;, v;mpress 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 slope. Wh b4ez gfci4qc(n. k+a5at is the speed of the skier on reaching the bottom of the slope? (neglect friction)fknicag be. 54 c+q4z(

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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, vsi*4gey(k*o0o2t f x18sjdn pushes off the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving a*1 4vk2*ots ixe 0j( y8fnsogdfter 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 frictionlesnhvhxb,4 5rr 4s inclined plane. At the bottom, it has a speed of 9.80 m/s. What is the vertical height of the p45nhh,x 4vbr rlane?

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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. Whgrl;c f6gq1f 6en it is 0.70 m above the floor, its potential energy exactly equals i;fqcg16gr6 l fts 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,c 3u pql.vn+k N, blasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajkpl u.c+,n3qvectory, 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 en.vrh9 ,wn)yxndi2 5u*zh6oeu ergy of 220 J. At the highest point in its trajectory, its kinetic ene 6u h h)nxeu,5*.iz9vwy2rodnrgy 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 starts7*musw5n65o: cmk3gzx bi/wco06 x pt from rest at a point 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 z moiwc:5xswg p7o0b/ku3*66nmtxc5 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 sp 9db za0a 1do0h9smuifo: dz.0eed of 5.0 m/s at a point 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 0zz0.h9 mifdbo 91aaudos :0dof 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 di3r 3v :mxmj/ dt:hqf0bp with a speed of 25 m/ t:v dr33q:jfh0xm/ bms (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 45 m above the bottom of the dip?


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78#
 
  What is the minimum speed of the ball at the bottom of ip 6wh91c ksd-ol-p h6bts 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 pulled 0.25 m away from ou ajp):o+r 9ho *cbi06*uur lthe vertical axis and releaj:+ ibo *oru6 ulo*hr9 cpua0)sed 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 uncoqt/- r xqqio0qh7)f8 vmpressed horizontal spring with spring constant ohtx 08r7qfv qq-i)/q 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, slows down her 2000 kg car to stop fora. y,* kru-jsr a red light. What work is done by the friction force against t*. -yjku rs,arhe 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-k umv, fk)us6.ggbu/*fqozzctwh 6h-tcd3 -()g object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.6mq 6 fv*do bftku- ,tgczw(hcu -u/sh.) g)3z0 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 rlh(nq,3t. ve wough, level surface. It has 24 J of kinetic energy. The friction force on it is a constant,.levhwq (3 nt 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 applieb.lczonb968 ma.p1 -m1a qyw od horizontally 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 distance of 10 m, what is p6n cw ozlo1y.a.98 mmab1-qb 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 worknuy7q:2 t(7ky izy ek. done by friction is yz.y:(k qt2 e yui7nk7$-6.0 \times 10^{3} \; J$, 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;; +55qyal njxl mvvtiy: -y2vd rises 2.0 m. It requires 3200 J of work to get the bty;+2ml:n5i -xvlav yq jvy;5ox 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 r8 bn) + vxa.gz)a9dl4q4iijr above horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed of the masr l)8r4iz.i9dq+ a v 4xj)abgns 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 ground with a7oa/: 7gz .ch os r.0ipjhpgb1 velocity of 7.00 m/s. What average force of air 1p 70zohro/ jsgg:aip..7c hbfriction 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 p+ +i)v fx1mrqy,p7x9i2w xuk 4qd-h qenergy when he runs up a flight of stairs 10.0-m high,7qq-+pfrv,4xqkix u)9ymx1wd+i2 h p 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 with a constant velocityu2 j oc6b:/iyl2iuyu(g tyf.4 of 5.0 m/s. What power must bu6 2u( .f 2 biyyugl4coy:ti/je 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 mk:l+ex8v4nu ya7gu +by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 74a yn+ uvle gk+mx:78u46 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 5k7dvbh i0(8 8q:dredmw7btbicqc ( 1)00 W while riding. How much force does her foot push with when she is traveqdecv(dbtb )b1q8(08h crki 7m i7:wdling 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 a mb/d04no) fl/*q,wev.ek(yh 0pic qlverage power delivered by the engine?ew/l/m0eqn,f c0*i)pq h(yd4l o kbv. (1 hp = 746 W)

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