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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 wqp8d)rmm0ht+oh/ + pmqj s-.jork 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 motionrmg 0f h4)ijsz ik.zb)ih4*)p1ygsy 9?

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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 agavk4p sb rb ,i.5pao1c;inst a stationary brick wall, the amount of work you .s54pcvpb raik1 bo, ;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 t9l cng7g7ny mu 1m),jchere. How much work is being done in holdingmg7 g9j,uccnl 7n1) ym 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 o5b2 yph p*kxny- 4ibs4bje2n by4p- 5bipsh*xy 4kct, 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 vertically 3.0 m then returned to its original otipz .()9pn 4xujgw,position. If the total weig xi 9wp()4nz.togju, pht 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 object do woxbiygg 11 e m/c4m8v72v;d ymh-ku2nq rk 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. Compare1y gxa4r n9/1zmm ;(olvq(bwn the sign of the work done by gravity while the ball goes up with the sign of the work done bxr(gv( zammlno yn;q411 w b9/y 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 cu7d9ekx - ha2wz cmjb(on2ev3.rve, on a Force versus position (F vs. x) graph, representsw 22bnx(3ho-7 v.m9a cze kedj

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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 the work done by ti3 d36uc;gkog og5np :f g)vv6he force F?g3 gv3v o:)dcpn ko6f6gui;5 g

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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 is3l cj15s:enx d positive, then the object's kinetic energy

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the net work done on an object is negative, then thhy u36bcir4zlf-vt ap -us*il --t;w4e 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 .q r6.gs7vp*fbtth o;object is zero, then the object's kinetic energy

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A truck weighs twice as much as kvr8ijcs5,am4qjx(* a car, and is moving at twice the speed of the car. Which statement is true about the truck's kinetic ener5j ( j*cavqxrmik48s,gy 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, annbwxa vn n 6cy:l9)a:2d car J has half the mass of car K. The kinet xw:v nna69l):2ban ycic energy 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. Whatgphhr k2ltu-al(;8 7y is the ratio of the final kinetic eneg8akhpu(hr yl l;t7-2rgy 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 pd,l1-y-yham8jtipt-0y kpj -ebble 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 8jy,-pdai pm1lyk --hy t0t-jmass 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. Aov, wr+3ko pa5 1.0-kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which objeov35 + ,wapkroct 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 h4 wrni7ck)-vin 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 co4 h7v w-)cnkirnditions?

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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 any/8cb ed/ --d ac- 7xtjvznb2oe friction effects, what happej/8/a ez do bdc-7xnc2-- btvens 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 pn-2y vkg p g5ebqqro 2(yy)n04rinciple.
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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 negat;m4hr a2x0bkx*zf* a five 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 the ground.z;q61+s.hc3 mnaal eu A second object with four times the mass of the first if released from the same height. The potential energy of the second object compm1 s6azn;hla ce.u3q +ared 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 cm y wguoc+y ye6j,qh;3+. If another 0.200-kg mass is added to the spring, the potential energy of th ; cy36hq gujyo+wy+e,e 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 systp r i:eywwns8 910*hw0gznu:kem

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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 kkukef 5y wd-78 ig*nj8inetic energy K, to its potential energy - gienwdk5 fyk88u7* jU.

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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 driving up5ua3sup 8z gs;nfp.h 7 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 vexr) l( :7.cofa;ztsbu8vz 9gury heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same friction:) zl;7busfor( vgt9ux.a8czless 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 ;x .u;wnob mu6$m_{1}$ 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+a5a+;a g tw(.9p:rln,xobi a y-aypv rgy for conservative forcesw+nav yaga rtyx+(p.-pa5,:;9oib la.
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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 thn;gk uo2rklaq;.x7t ; ex;o 0re air (air friction is present), to the ground below. How does the kinetic energy (K) just before striking the ground compare to the poteng;ao r7l oerx.2k unt;k; x0q;tial 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 energy. Do nlcg c:6ubep2d y0j cu,*m4i6eot ignore air resistance. How much gravitational potential enej lpbm edccie60c4y*2 uu:,6grgy 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 30 J of gravi-kul8-tlohzu4l(6o.sf k s1z tational potential energy. Do not ignore air resistance. How much kinetic energy did the bl-6ozust4 kf o1 -lu z8k(lh.sall 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 e:obix3o q*l 1sged2 i.-tgwj3nergy.
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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 is7d8mv8xyu7b m d65aoo

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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 six72 l,k8-er)ab5z0i hylhI 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, whichn:q rfb k7 l6fvv swt0z2krf83; ,leg+ is not a unit of power?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to yesterday, you did 3 times the work in one-third the time. y.rt+*g k*lz w 7au0urTo do so, your power outrr +a. uzk*y*lw70gut put 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 enginggm dz1 j(ali(:o :xn*e 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 sevfx f *uymkp 9+g9ij/j(m/4jxjn()object weighs 90 N, how much work was /j/mf( (gijfxys9+)pv j*k9 4xe mjnudone 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, a3q ;vz mer.r3ft a constant velocity of 0.50 m/s. Wharqf33m r;z .evt 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 consrcs5bs9l ,v- (d,gfet tant force of 5500 N for a distance of 50.0 m. What is the work dofd9, sg-r tsbc(l5ev,ne 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 constanroflqmd 5)g x xk(-a*8t force of 5500 N for a distance of 50.0 m. What is xa rxmdqo k)5-8g(f*lthe 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 whq gqj,sm1hiaxh r04s n563a0ith a constant force of 5500 N for a distance of 50.0 m. W3s gm5h0a4qj01ainhqr6s , hx hat 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 mlleezs 1ac4(a: *w*/ q pxfmy2 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 slide jw*wt tl4 g8z2du*6g .lrg+tps 8.0 m down a ramp, inclined at $30^{\circ}$ from the horizontal. If the box slides at a constant velocity of 5.00 m/s, what is the work done by the weight of the box?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Matthew pulls his little sister Sarah in a sled on an icy surface (assum;9w jl60gxo ike no friction), with a force of 60.0 N at an angle ofgoj6;k09 liwx $37^{\circ}$ 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. 6-1 bx-)2z q 2owxs shows the force versus the object's position. Find the work done when the object moves from 0 to 2wxz-ox2 bsq)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 v0sdqnmww5 0h:puk87q5b;bd 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 4.0 m5;:nv 50b8um0pb wddq7wks hq.


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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,;lm,qlvuq lyi 8 .lh*,v6tjf direction of the force. The graph in Fig. 6-1 shows the force versus the object's position. Find the work donei,;t6uvq .qlmvl*y,j ,l8hf l 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 ra 6tk63r )tlethe force. The graph in Fig. 6-1 shows the force versus the object's position. Find thek6rta6r e l3)t work done when the object moves from 0 to 6.0 m.


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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force of *2-l/h,cdr0;g twelgh5cd vz 200 N is applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final kinetc *h5 ggd/l ztc;0rhvw2ed,l-ic energy of the cart?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal force of 200 N is applied to move a 55-kg cart d7pamky*, ur3(initially at rest) across a 10 m levely,* m7a krpd3u 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 .b:)raobc -e ocime- o5gy 3e(with a speed of 5.0 m/s. How much work is required to stop the ma -(o 3-.iecgoeb ry)moec5:a bss?

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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, wh x0:r6v:4up zuo0. 1mwu svyfnat distance is required to stop a car mf: urx0vpuo.uvmz 6 n 1wys4:0oving 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 b-i 9ex0b.:cu;t.me fnn0toc-g dart. It is cocked by exerting a force of 20 N over a distancebonf:9ncte -.;tx0 icmub.e 0 of 5.0 cm. With 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 horizoxqebcn;oxzsgs2g o . h 2-:(4fntal component of 80 N and a vertical component of 60 N. The force is applied to a box which rests on a level frictionless floor. The cart starts from rest, and moves 2.0 m horizontally along the floor. What is the cart's final kin(s ofg-4nbe2cq;x2x:og. z hsetic 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 if0p(x95klm(. sr kay1x57h psdowl- ms shot horizontally into a bale of hay, striking the hay with a velocity of 60 m/s. It penetrates a depth of 20 cm before stopping. What is the average stopping force acting on the arrowr sy97(x5lf hxa0.5od-k(pl p1mkm sw?

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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 2wv,lr(v1rhl f fa97 xof 13.0 m above the floor. What is the change in gravitational pot 7hwfal(r1v9 xf ,l2rvential 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 plan dgi0s 9n em616nhx7evoamg-9 e is 4.0 m long and rises 2.0 mme9 -dm a gxo ns79ig16ehnv60. If the 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 2.0 cm. Whabt(j j 92n8ns1e 4tctl,,hqxog)n za- t is ts 1t 8-th4ozl qa(n)bt 2cjjxn,n e,g9he 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/m. How much potentia lqtw6.rkgu7myhye q -2 r1n/;l energy does q/r m hquk. ley67 2-;nyt1rwgit 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 in2 iz;) kimwa-litially uncompressed spring with a spring constant of 25 N/m by 10 cm.la)k2zi m; -iw

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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 qcnf m(psi r: e9ibcn2 np.,8c p)eg2c19seh6from x = 0.20 m to 0.25 m? (Assume the unstretched pos6c.nqee8,np2c9fsh(9gn :cpibprms i12e c)ition 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 sprij.bbl,. toa /tng constant of 15 N/m is initially compressed by 3.0 cm. How much work is required to compress the spring an additional .bo/ .a tjt,bl4.0 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 vc:0oq; vqb v wt4axxnp- 3+,ahigh slope. What is the speed of the slier on reaching the bottom of the slope? (Neglect q+ xpx,t3 navb0q:wv- v;oc4afriction.)

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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 spee9a zktfh-mh f; l1o171t/(cd7a;/ h gab sptwnd of 4.0 m/1pcmna/tf77b /hz1t a9o kd-has( g;;wft l1hs. Neglecting friction, 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 frict7d q3c ,+juv;o cckbr:ionless inclined plane. At the bottom, it has a speed of 9.8ccjq:v d b ;kruo,+73c0 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. m7ej;gyuo*0 u0,vmp( m w,kon70 m above the floor, its potential energy exactly equals its kinetic energy. How fast isun,w;mj ke ,mpuv gy0 (mo7o*0 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 s)l(-2qqke.om-k k fv with a kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J. To what vertical q-f-kov.2)qksmek( l 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 mass2tsfo .kor0w9gt)v tqx -x. s- m leaves 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 its launch ps..k20qtvxt)g - fow-ts r9xo oint, 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 pokhi i-ydt1. for*vr;-int 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will bed o vrhr-y-1it ik*;.f the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?


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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A roller coaster starts with a speed of 5.0 mh/smki l*9 9ut/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 of the next slope, which is 30 m 9 ilust/*9hkmabove 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 pointd)aou dy *8o)j 30 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at tyddoj )u 8*oa)he 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 wzl2v901ox oqz8v8sh 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 pulled 30 cm away from the vertical axtdaph(d+ )j2 zis and released from rest. What will be it)p(th d+ dz2ajs 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 os4 v5p4jlo ):ooux-s wj/xzii(a 1 c*uncompressed horizontal spring with spring co j-o4:)uj*is lxsp4wza/5 x(oo c1voinstant 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 do f80euv ,ym+ lsan;qc,wn her 2000 kg car to stop for a red light. What work is done b8vm, lu;c+ns, 0aqy efy 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 object and a horizontal surfacernvo +d v*6d-s-ao lx5 is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will irl 6a*v dsvn x-5-o+odt 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, leveaazc 1qps3t5.8hm: kt l surface. It has 24 J of kinetic energy. The friction force on it is a constant 0.50 N. How far will it slide?: stmazha.q51k8t 3pc

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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 2.0-6f+u3ihzo6qe jh 4(al kg mass on a level surface. The coefficient of kinetic friction between the mass and the surface is 0.20. I6iulzhq6eah3fo ( +j 4f 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 top of a 50-m h*e+csee1e b v,igh slope. If the work done by friction is 1 ve+ecbe,s*e$-6.0 \times 10^{3} \; J$, 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 a7i2/pj 5oq(f rwbxj(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 f72q b5(ipjow(a jrx/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 7prmdjy*03 g gabove horizontal. The coefficient of kinetic friction between the mass and the plane is 0.20. What will be the speed of the mass 70dpjrmg g*y3 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 heighob*k; k3sn n/,zao)or t of 10.0 m, and strikes the ground with a v ,nksok3za ;o*b)r/n oelocity of 7.00 m/s. What average 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 up 5- 7 no)g5yke yflnnx/a flight of stairs 10.05-7k yolnn f)xn 5/gey-m high, in
8.00 s?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-N force is needed to move an object with a cou41 *5ka rjpym1tsb0l nstant velocity of 5.0 m/s. What poweyrk0t1b1m 4sla* 5pjur must be delivered to the object by the force?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How many joules of energy are used by a 1.0 hp motor that qgnxk p (; qxr0,(,sxoruns for 1.0 hr? (1 hp 0qokxx(sp( q xg;n r,,= 746 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 500 W whil8dzsyjv b+l3x(gvf(93qlt w 5e riding. How much force does her foot push with when she is travelin5( lfv 3ysqjd+8gvxwzl93(t bg 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 acceleratese)ai;snky12 t from 0 to 25 m/s in 7.0 s. What is the average power delivered by the engine? (1 hp = 7)2yiet;ansk 1 46 W)

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    总分:95分 及格:57分 时间:不限时
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