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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 ompp7e:-dff96 jvpiqm0pb 7t;f work 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 m9zy4 -ulgwf/ebmr8m3m0 x: z 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 +l+ mpt.vr 6idovo+e 3stationary brick wall, the amount of work you edv6otml+vi r+ 3p+o. 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 2.0 m vertically and is being held tgd v0e, an+q/ xypdx14here. How much work is being done in holdin+10eq/ xvxgd4y pad n,g 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 foa8 07jn1ue-j+e ufz5v)cn ydorward at a constant velocity carrying a 10-N object,an7jez81y f ej50cnd )vu-u +o the 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 verticajy46/jv ez ,pmlly 3.0 m then returned to its original position. If the total z,/j 6pmyv e4jweight is 30 N, how much work was done?

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Does the centripetal force acting on an objec4 pjqp1)t4vg st 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. Compar/a8xb9i3a mt7;pn)ww+ddui v e the sign of the work done by gravity while the ball goes up with the sign of the work done by gravityp dut+i7v x8b9danai/ )m ;w3w 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 9rkap( y g8o2;a;zz mc94ighg vs. x) graph, represents4zcgogzm8;a 9 ar2(h 9pkgi y;

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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), whatad j 3s w(li6n ne+vlud(-4o9u q2fc2a represents the work done by the n4 ji-cusq9f(l2d vw62 an3 + d(uaoleforce 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*gke8:nt g/).jrl(ty qk r)zv 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 negativevc*u r-c4f,ehh t5e*nlns*7 ix4qii tj08a 2n, 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 )qgmge-4v .mw 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 rcy1mc .th96ma car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic ene cct.m9 m6y1hrrgy 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,0caf:6xdf:w hc uvb-; and car J has half the mass of car K. The kinetic energy of-wa h:0:ubvf; dcf6cx 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 with half of it.d n lp-ka5.azs original speed. What is the ratio of the finalaa. -lnp .dk5z 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 is moving at a spj9o.kbfpxn3rib 9fw7o ,v3a u.*lb, zeed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to ..3uz*b ko ,nrvojb7fl,iwx3fa pb99 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-kg massar mcb52-;v tl is moving with speed 4.0 2-bcmtla rv;5m/s. Both objects encounter the 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, and skid a cer9 gss( 8 ot.uq6p9fl qopg)eu2tain distance on a straight, level road. If you had plsgqo)s(uu86q 9pto2e.g f 9been traveling twice 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 th) g : ,eyskzwf;e dg4l3nk w-vnk4/0ule Sun in an elliptical orbit. Neglecting any friction effecn3ww dfzv0ln kel /es44,u);y-g kgk :ts, 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- /mxg 2e-vyo.x g(uo n.sdgu1 principle.
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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-6x sfaqb:yi5;/zlm j 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 abovrxrzl 9znbs:45 bn 1mxf h, twwzu5y5a5t g4..e the ground. A second object with four times the mass of the first if released from the same height. The potential energy of the second object .my94xw fxtzus 1zba55 :ngwnth 54,5z .rblr 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 attaco2 -w2+hpui u7is189 3cxrs :sbnktz-hdt+ kr hed to the end of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to rdt8sxu- i-c i+z2h 3+bsrw1k7:sukp9t hon2 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 of a sy7f nyk.e -1nxhstem

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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 euosmks;ufty d81- b1 0nergy K, to its potential energfu1 umso 18;dty0sb-ky 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 driving6n l7qd,r(s hw 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 object are slidingbxnfom 0+f5s. with equal speeds along a level frictionless surface. They both slide up xbf+5mn.sfo 0the 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 ;hn/gl zx2ubp d;fnl/ b jbvy8b)8:d1a9g-z j$m_{1}$ 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 cons*,tc9 dxskobs /6 a9y peu9ll)1cusj :ervative forcesuj p9xolb9 es:/cacdu6 sk ,s1 )l*y9t.
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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 topwoo/3pqml1zaq /deo+ 1d5 up 6 of a building, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground wm+ qp l/eoza1pq3u51/6 ooddcompare 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 3837y6m rzcg l b*r-sbm0 J of kinetic energy. Do not ignore air resistancegr 3r6l*m-z sycb 87mb. How much gravitational potential 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 and loses.ovu/z.d 7*vjz +ux4 if(yzbm 30 J of gravitational potential energy. Do not ignore air resistance. How muchu z( vvfmojziz 7ux.4byd/ *+. 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 conseru4lv84hi4qxk )i- j jzvation 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 is5dca wvp .l.jcxzx9:( jes:x2gk-0gx

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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 powel6hyq* b 5j,ynr expressed in SI units?

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Of the following, which is not a unit p0mt5tick1 9;ys+ o tdof 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 tu): 6j5w l -vm xzd:-xufiffq61ooju 7ime. To do so, y 1zuvf6 d:-:j7oqxxu miofj-)u5fw 6lour 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' a-773odazga as 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 zpw)e 8dlv 1*ivertically 2.0 m and held there. If the object weighs 90 N, 1de p8lzv*w)i how much work was 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 thr 2bov,,3y nwd67j91dpimqz. 4 p qkjxe air a distance of 1.0 m, at a constant velocity of 0.50 m/s. What oi 4 jq.p9w3x,my2k6pzbd1,j7d qvr nis 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 pullejo3 l j4os +bk3)7 eaouldcb98d upward with a constant force of 5500 N for a distance of 50.0 m. What is the work done by the 5500 N s3)koojb dbc o 3479l+al8je uforce?

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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 upzs-kymk. 3o/t ward with a constant force of 5500 N for a distance of 50.0 m. What itko-y z.km/3s s 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 fd kwh 573 +(bynh1skbforce of 5500 N for a distance of 50.0 m. What is the net work done on the elevato7bkhh5ny 1fk s+w(d3br?

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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 yrh -*fjb9j:fa $37^{\circ}$ 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 sn0,cazj93shl n 90g e;a;ak)adf/l s blides 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 littlgt0 8 e3,g*q 90fmjel2;kyplzdrprd5 e sister Sarah in a sled on an icy surface (assume no friction), with a force of 60.0 N at dqe tj0 ; ez*fp3pgml gr250lk,8rdy9an angle of $37^{\circ}$ upward from the horizontal. If he pulls her a distance of 12.0 m, what is the work done by Matthew?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the force. The graph in Fig. 6-10q7p9x q p *xfvfia4l1 shows the force versus the object's position. Find the wor 719*qp 4fifax0pqx vlk 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 the force. The graph in8e6)3je,s(r* j )vyvtc q vxut Fig. 6-1 shows the force versus the object's position. Find the worjrqv)sv68*cve3,(yx e jut ) tk 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. The graph in F*tco;c4ed h n9ig. 6-1 shows the force versus the obje*d tnc4heco9; ct'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 in Ffbc02ca.j 3sm mbc;r;ig. 6-1 shows the force versus the object's position. Find the work done when t;c 2cjrc. 3bm; sfbam0he 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 c2rn4i g: am;*j ltpu8hrct :f7art (initially at rest) acr t;:7npa j *fr8gtim4lr2: uchoss a 10 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-yz+6s (psat /vkg cart (initially at rest) across a 10 m levsyst v( a/6+zpel 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 much work is required to st io8,bfhcg;tcn .5asu0i8 7miop the mass?80scg a8;t7io n.cii bhumf,5

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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 is reqw9o*y* t) 8sffdw*aiquired to stop a car mo y o8wi)*taf*df9ws*qving 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 cocked by exerting a for5nttrwp 0 ek)0ce of 20 N over a distance of 5.0 cm. Witt5e0knw t0r p)h what speed will 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 component dijc6l6x ay8 o- l+rk)odg (sz),u.d mof 60 N. The force is applied to a box which rests on dr6u-o 86d.kia( d) cl )xzgy,+lm ojsa 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 0f y4ebufo5c366ry ebhay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. Whato b6 fy64be0rc5e 3yuf 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 h -pf6) 65e1jq(asaa7 f eymsskeight of 7.00 m above a floor to a height of 13.0 m above the floor. What is the change in gravitational poten 1-q)fs e6a5(ys7ae kas6fjm ptial 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 planei;8- e 8*n1vwkxjzguh is 4.0 m long and rises 2.0 m. If the plane i hikzx ;-vunw gj1*8e8s 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 2uzi+a0q;xapd7cq f 5stretch 2.0 cm. What is the sp dc7x2ua;+ifqa qz05 pring 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/m. How mu n6w qq:vy0i7r8l gs/xch potential energy s7x g i6y:wq/ rn0l8vqdoes it store, 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 initiallvf w 3s4apg0+qzhxggy58p35sn,z rr 9y uncompressed spring with a sp8r4sq5 9gz+05nf,rg pghaw yzp 3s3xvring 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 Nkrr/b )x q0fp .cwc93g/m from x = 0.20 m to 0.25 m? (Assume the unstre0b9r.frkx/c)p gw 3qctched 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 const5 3 uaecfo .a)oa)(he2x :uiunant of 15 N/m is initially compressed by 3.0 cm. How much work is required to com eaoo53fu.n:eca(axhi)u ) u2 press 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 higex)tb6r-y/lb *j mt 6ph slope. What is the speed of the slier on reaching the bottom of the slope?plmrtx - ybj6*)6et b/ (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 opyqc-y43 k )pvff the top of a hill with an initial speed of 4.0 m/s. Neglecting friction, how fast will she be moving after dropqp- y4cv 3pk)yping 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. Am/ans/x dquj 3h+bz(*ggt0 h/flwj, 3t the bottom, it has a speed of 9.80 m/s. Wg+t /hfsd/w jgn(a0h,x/q3j um* 3bz lhat is the vertical height of the plane?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 1.0-kg ball falls to the floor. When it is 0.70 m as*hhl0ozket sq48 3: bbove the floor, its potentialht 0ls *oq8bsk4 hze3: energy exactly equals its 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 kr6gm5kg8 kwu h .o22d6dgyq*10 N, blasts straight up from ground level with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical erd 6hyo .22k8*5gu qg6d mwkgknergy 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 l (+i9jemif5 pgeaves the ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to i(epig9 fj+m i5ts launch point, did it rise?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts from rest at a point 45 m above the bottom of a dip (S wxxh: vcql.ya,y-nm 4kxqxy(:p7(;nee Fig. 6-2). Neglect friction, what will be the speed of the roller coaste x:xn,w7mnk:ly hy-4(q.xvpx aycq( ;r 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 5fif ;y;dz- xz5.0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what f;i z-;5fzydxwill 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 muo panmwi4p3x /(-j/a t7 im,with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will bwm /io,4ta 3unamx(pi-/ 7m pje 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 spl2 7rw0g l gcb2lu79ooeed of the 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 is pulle9qvi3epwuq*g659 /x0 h-rexbjc5r kod 30 cm away from the vertical axis and released from rest. What will be itwph/q* kvxbcj599 u 0r6oq g3exe-i r5s 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 initiall u(u +ikr8)m*n:ejycpy uncompressed horizontal spring with spring constant of )c(eiu u r*:jy+p 8kmn$2.0 \times 10^6 \; N/m$. 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 for a red lw) hdg tmw0(x/ight. What work is done by the friction force against the wheels?0/t(mh dwxg )w

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The kinetic friction force between a 60.0-kg object and a horizontal surfau0 p+vewz*))1q vruat*uyf6p ce is 6av+pu1e)upywtzvrf0* )q *u50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide before coming to a stop?

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 12-kg object is moving on a rough, level k)ie7-k)nhox +fda 0a9of 7jtsurface. It has 24 J of kinetic energy. The friction force on it is a co9aeo)knxf)jkhi 7t 70o f+-adnstant 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 horizontally to a 2.0-kg mass on a level surface. /i+egls72 jsh3 k/dcpThe coefficient of kinetic friction between the mass and the surface is 0.20. If the mass is moved a distance of 10 m, what is the change in its g/2 slek/sihdc pj+7 3kinetic 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 iqbp;gy- u)z 1from the top of a 50-m high slope. If the work do ibuy1p;q g)-zne by 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 planf r l)tvx+f9y kea. 2jd)4oye3e. 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 of the average friction force on the box?e)9dtf)2 j +f.l y4xoey arvk3

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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 0 -ajg*9j( wkxw( acjf1,w xpxof a plane inclined at 20e above horizontal. The ax*w j pj(wwk91fx (gja0,cx-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 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 j7g j-ct, sk i v,3c,lct-oo5kground with a velocity of 7.00 m/s. What as3c,vtck jk7j lo,-ic5-gt o, verage force of air friction acts on it as it falls?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what rate is a 60.0-kg boy using energy when he runs updd6*/fu*us6yf0jt *ovo ld,s a flight of stairs 10.0-mluu 60so* dytod*jvf/,6* fds 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 to move 1am9 mxk45;hpvse+i/ +kx4uo z1a fbcan object with a constant velocity of 5.0 m/s. What power must be delivered to the object by t;4 mus/+a4 1 5i 1eofkpm9hcbkxav+zxhe 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 m zp g,)u gh99fj4 9./rr tu5r(sezlay (uu*tnpotor that runs for 1.0 hr? (1 hp = 746 W)9.f y n tuers(galtu)p/ 4(zgh,r*p5 j99urzu

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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 aix7( mjfc gir 1.lnvk. x.5;ojt the rate of 500 W while riding. How much force does her foot push with when she is traveli.r.5of l1i.xx;jiv n(mk j7gcng 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 mr5ja )aosat(,2)do87jgs(gpedh je : :vss:k/s in 7.0 s. What is the average power del pj :,s (ejegrsh sa o:)2 ()d5ojgada7kst:v8ivered by the engine? (1 hp = 746 W)

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