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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 expresug,uz8kr 4,aly zme e5(w,*3ej6t srq sed 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 mots v0ic2 x )sxgv31zlo7ion?

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you push twice as hard against a stationary brick wall, the amoun) 7ej0k)k2 +rnpfr lku:gdu (ut of work yoku j d+kep:r)unu(2l07g)k rfu 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 lif+w8ke (n3i/q h,fuhbp ted 2.0 m vertically and is being held there. How much work is being done in holdinph(fu,+/bh3ek wq8 n ig 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 carryr /k7; wtvo)x )3rek p;li6jt4tk7xtxing a 10-N object, r ;rtpvw )) 7 x3 tk6ki7otxtl4k/;jxethe 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 retls,zdrwc .yo pff /*8uo,b3l 1urned to its original position. If the t 1y/3b .odfl lo8pcur*,swz,f otal 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 acting k9lw7d zxh69y1 xv/iion 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 by gravi-(3qr n-ucptudjb94i ty while the ball goes up witqrb-(-n3ud9 4tpui cj h the sign of the work done by gravity while it goes down.

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The area under the curve, on a Force versus position (F vs. x) graph, represe wxkb*v z**f6g lp9f-cntsxlv9-6b**gw *ckzp ff

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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 reprebe3)gif9 g(7 ) wagzcqsents the work done by thee g97gg q (fac)b)zwi3 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 po grf qv/n(8/kositive, 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 t1 e1o 7*hco-mgdyowz4 he 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 objvd z8k d4je/a+ect's kinetic energy

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A truck weighs twice as much as a car, and is moving at twice the speed of theg h 6x) f)bkwxewf89f9 car. Which statement isk6))f efwg bxfhxw899 true about the truck's kinetic energy compared to that of the car?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Car J moves twice as fast as car K, and car J has half the mass of car ( 6pib(j-rl q:65noddn w5uiiK. The kinetic enerd(ipld6ri-iq65n uno ( wj5:bgy 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 with half of its original speed. Whan8fft;h0kf jl o-t9. lt is the ratio of the finalhf - ll9toknt;8fj0 .f 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 u,kuyt gy57z -a pebble is moving at a speed of 5 m/s. If bot5k7uyzt g uy-,h objects have 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-kg mass is moving with speed :ux y0yy-p1nmt 7 yj0p4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance beforyj 1y nyxy7t- 00upp:me 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 brake g1+ vx.0tydzowfy((bs of your car in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under the same cy+obw(ygt 0x1 dv.f z(onditions?

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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 ellipticd/bg;hbvtvye4/ c; p .u))zr dal orbit. Neglecting any fri) v/y ug )vp/4htedbc;d.zr ;bction effects, 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 princp,8 ps/3zig7 .kivr rpiple.
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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 ey;br/ 7kovj ;s zg*wy qn+5in-/pdr,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 the ground. A second obbs+,h dln 08hyject with four times the mass of the first if released from the same height. The potential energy of the l n8d shh0by,+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 thts w34)tyd-1z9z er y;fobj*xe end of a spring causes it to stretch 5.0 cm. If another 0.200-k*o s )9texyz3d; fztwb4j 1-yrg mass is added 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 of a systehjtp q9d;k )8x vy1t3zm

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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 potentia ia zlgq.f rj0(rh f.m01c88recxtw5hv,fx), l energy Uvhcft.a r0lr)r 8i,mhcfx. 5ej8gxf0q,zw1 (.

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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 d16*v9u8,bv d fan: u ony*jsitriving 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)7d ceep- ls7lul(;la are sliding with equal speeds along a level frictionless surface. They both sad7 u7l)eclsel-l( p; lide 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 ok2,rc 3i9zy,wwnf(f$m_{1}$ 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 lxp8( wd2 +zkaconservative forces+2la8xp(dwk z .
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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 tuexmy98*4tcm9o c dj 45vk7erop of a building, through the air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking t toe4mv*9ec549dx7u krm8j yc he 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 kinetic ew6/jmt t exv47rf k;f(kop2u3 7g.mibnergy. Do not ignore air resistance. How muc3ib.um kg7efk7 f4tr vpw2 jo(x/m; 6th 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 vjsit1n2w 2xc /mbxb4-s c6d*and loses 30 J of gravitational potential energy. Do not ignore air resistance. How much kinetic energy did *wdci ts 2cms -nx24b16/vxbjthe 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 r w(o5swd5 0v *pnaom,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 is6ry0 mx;xs vd-tz1 tw 7f2yca+

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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 ucqs k0 g3r03un)w q)yqnits?

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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)+r8dnto n7.igor- ow 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 time. To ,7 etk c2hl,giud: ow5chl-l8do so, your power output must hawdc -u7 2clht ,lk :hge,il58ove 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, tm:-cz-g ) kkzmhe car's engine must

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is lifted vertically 2.0 m and held there. If the object weighs 90f 3*u6( kgorilp- ipnhm6k2: l N, how much work was dor6ihkm lo2pp n-(g6uik:*3fl ne 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 distanceh/xopzip; sz/8 eo2qk,a:iw 6 of 1.0 m, at a constant velocity of hkps/p z,oe86 ;ozaii:/qw2x 0.50 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 constant force of 5500 N for a dista ,kvm3)czbxw),rq, t snce of 50.0 m. What is the work done by the 550)tb ,, ,sxcr )qmzkvw30 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 dista dy:hvn8py9 sju9rg3 :nce of 50.0 m. What i :g9rjy3ny:v98 dsuh ps 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 cons7 y 59 4wt5 *.p.mhslbyuif+efzuvwe 3tant force of 5500 N for a distance of 50.0 m. Wpw3ib.* y +u.y5wu7fz temv f h5l9e4shat 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 8.pcq) amc.iy 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, incn5sx *7kdt) jklined 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 lisr:jky .x s wbg z ,1,7w)ceszc(rck:0ttle sister Sarah in a sled on an icy surface (assume no friction), with a force of 60.0 N at an ang:k1:reysb,c z7w0sczr k )jx w ,sgc(.le 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 tzre yh8(l+w+ n8g4odqiwy 4 6khe direction 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 04olw 8e q+8 gk6yiyd4wn+zrh ( 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 dirp*-,m e:wzl 3w bjmmu m/n0ml1ection of the force. The graph in Fig. 6-1 shows the forcmm b:3jm*nml0 pulme1w-z,w / e versus the object's position. Find the work done when the object moves from 2.0 to 4.0 m.


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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the dir:ep+ u-du/-r+csn ve5( fryc tection of the force. The graph in Fig. 6-1 shows the force +d--:c u r/y n(r+cvf5upest eversus the object's position. Find the work done when the object moves from 4.0 to 6.0 m.


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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A force moves an object in the direction of the force. The graph+ku jd5 8ux l+semk. a2e)u:vz in Fig. 6-1 shows the force versus the object's position. Find the work done 2k:alv+u)xke+jzem8s5 .u ud 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 (initially z0kldo:ntva; vq:44( c ol(vkat rest) across a 10 m level surface. What is the final kinetic energy ofv4lzqv(:l0 4c:v odka;nt k(o 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 (initinh(sq)n kwphas y-r yn;uv , u)/y;()csogl /4ally at rest) acryrhnwv)an(-l );s;/skynu uy(cg q/h) s,p4o oss 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 much work is required sai+ bha , +)0kzw3gj- zm(hlito stop the massk+imz, as (wh3aiz+0 bj lhg)-?

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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 carnf6c yf+tbyus6a7 l76 initially moving at 25 m/s, what distance is required to st776an f6+b6tycfsy ulop a car moving at 50 m/s under the same condition?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A spring-driven dart gun propels a 10-g dart. It is cocked by exerting 88b7jia9nf2wdo rs p3u 5oe3n a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming the spring haa rd3 n8 oonj73fw 9bepu58is2s 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 o9d;ece kqw98 s22o pdri21v aef 80 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The d2o 92qcsak1 ie;8p9v2dewercart 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 h0j,p8yns 0 z xb5kvi0qay, striking the hay with a velocity of 60 m/s. It penetrates a ksybpvxi ,j0805 0qzn 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 7.00 m above a floor to a height of owh wkzy);0.n13.0 m above the floor. What is the change in gravitationaz) w .wok0n;yhl 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 inclin oa2*fw(9zdcv;t a66/pcj jzled plane. The plane is 4.0 m long and rises 2.0 m. If the plane is fricti6z9j(cwd2plo*afj zav6ct; /onless, 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 4064t iiwlj qwf,j s7 ji. qbq6xsd-r1spring, causes the spring to stretch 2.0 cm. What is the spring cons tf41dxjisb4wj6s7irlj i. ,w6qqq0-tant?

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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.lsbn/vzxy42 /1s j7s(g dsyp 2 How much potential energy does it store, whepg2/ss(lz1n 4s/ svy x7 db2jyn 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 initially uncompressed spz. j92ke 7qtekring with a ke ez9tj7q k2.spring 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 spr;k ome.3gmgr xx).r7kv lf3w 4ing of spring constant 40 N/m from x = 0.20 m to 0.25 743;r3kmmrvoe )wgxl..kfx g 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 cone* endq.2b0butk n)5 zstant of 15 N/m is initially compressed by 3.0 cm. How much work is required to*ktb0 .e dn 5ne)zb2uq compress 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 fr fzs+-7njhj h.om the top of a 50-m high slope. What is the speed of the slier on reaching the bottom of the slope? (Negleczhj-n. s7 h+fjt 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 spe2 7w5 k.7 v,p +zhmkmplxv7xlvo h2h9ted of 4.0 m/s. Neglecting fr27p7 ovmhkv k wx5l.+x,9 7hztlvhmp2iction, 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 4 ij.e 9chm/ fze5:erpthe bottom, it has a speed o94hemefc /r :jp.5zei f 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 is 0.70 m above the floor, itrc1 3bj5u3itcs potential energy exactly equals its kinetic energy. Hoc3ct ir3u 15jbw fast is it moving?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A toy rocket, weighing 10 N, blasts straight up from ground level witx 3 1evy6/xzqxdma* 9wh a kinetic enmxqzy36e/xwxd*v9 1a ergy of 40 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 witq tygl0 )w61igh a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative ggw)iy6 l 01qtto 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 res;.s6q n yrk.zpt 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 6py ;r.zq ksn.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 at a ngyc3 )z ,q 6(qys9+m/jebpxxpoint 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 o6 n/ ,bxjy9qxq(cz p3msge)y +f 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 t .,e36rrt n/yb)qxquabove the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of ruy, t)xe rqn/6b .t3qthe 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 atbtub7(fs .rvnz0ydgx2)2y 0n 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 5mv w3* 64lk pwo+x1udy0 cm is pulled 30 cm away from the vertical axis and released from rest. What will be its speed at the bot43pl*k vuw 1mdwo+6yxtom 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 hi4qya(b;r2v-) v dyzk z dbaq27ts an initially uncompressed horizontal spring with spra (4q2d7ybk -a2qdy)vvb ;zr zing 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 m/s, slows down her 2000 kg car to sto 8 y-3z9l8u.d)boxmy1clskfl uk i26 zp for a red light. What wz .sy8u 3u2mk z6ilf)cobdy1k-l9lx8ork is done by the friction force against the wheels?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The kinetic friction force between a 60.0-kg objedtq p7qy2)m pw v*x+iuwr- 7f0pb7rmu1zfu /8ct and a horizontal surface is 50.0 N. If the initial speedrdy1b 7r)pmqv 8t+7uw2fu-pxi *ufz7p0m/qw 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 surface. It has 24 J of kineticje qt*,bv6a.lw-7z.oriv/t t energy. The friction force on it is a constant 0.50 N. How far wv. .*qb6aoj- / 7wivttzr,letill 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 7g fzpqp4cm k-y5nb9v:7dh) a 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 :dbnvfya c7 75phq gpmk49z)-the mass is moved a distance of 10 m, what is the change in its kinetic energy?

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 60-kg skier starts from rest from the t.hbxp :4,brgp5 e((xvekh2r :kaq1m wop of a 50-m high slope. If the work done e2m4 5gx.h(r:wkprah:bvke p q1,xb (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 planp4 p9d:x0px kee. 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 40pdk:e9pp xx 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 incl /afu: rw54,yem;z ,vjno lq2vined at 20e above horizontal. The coefficient of kinetwvn:o r;v, y/m,u ae2l qz54fjic 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 ofelg6b+8d1-s8/ qol6 cjlt5, xav ovsh 10.0 m, and strikes the ground with a velocity of 7.00 m/s. What average force of air frictios-ho 6xll q, l1cstobd 5j88/ ae+v6vgn 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 hee1*cht nb9jzfc( l7) i runs up a flight of stairs 10.0-m high,*9n cicj (bf)elht1z 7 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 velocity of 5.0 mc9:fh hx*+y;h-p esvu/s. What power must be delivered to the object by the force?hv +he h9 yuxp:-;c*fs

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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 for 1.0 hr? (1)5(f ;wlulu sdf2lbpl6e2 tt3 hp = 746l)s;u62wule (dt f5flplbt 23 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 o0 ikg8/xx x4:wo doh 52jrs3byf 500 W while riding. How much force does her foot push with when she is tra380d2bk xjhsio4yx5wr/ : gxoveling 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 poweyaent)k-b-- g r delivered by the engine? (1 hp = 746 W)b)-et-y- gna k

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