97.01: A force F directed at an angle of θ above the ht/cctybk 5(m 7orizontal is used to pull a crm 7btck(5y/t cate a distance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass mranngw m: h1d0eirx,3 ro;v). , which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant decedn.iw) ;0ohrrv m e a:g,rn31xleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer h0 1 q8dd.pnfambqlj+kf/ w .f2olds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 se.8p2qffqdaw f nb l.10+dm/jkcondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizontal2o oeunfjs3pe t-rn k( 7 k:53xe+t5ey surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J ir:+k537ojkn x upe5-yn et2(eetso3 fn this time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block znsuww2d 0;-/7hfxs x slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energyx nzw2 sxd0uf;wh/7s- strictly decreases from 50.0 J to 20.0 J in this time.
Which one of the following choices best represents the magnitude of the block’s acceleration during the motion described?

  16.11: A 12.0 N net force directed to the right gf4u64 .sq rbpis exerted on a 3.0 kg block for 5.0 s. The block was initiapuf4q.s 46 grblly at rest and slides on a horizontal surface.
What is the speed of the block at the end of the 5.0 interval?

  16.12: A 12.0 N net fvq8thl *qdvh 4:k0; 1c,jlmd * og:wgvorce directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a v4q*:0 w;g1vlvdktmjhd oc8l hg q: ,*horizontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a frictionless froze0b* rl,wdn c.rn pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the student moves off in the other directi*0wb ,rdnc.lr on. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and ac5m1jp bcymm:2 vo.4 gives it kinetic energy. An hour after the fan has been tur . cb jpomy5:cavmm142ned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has a position of 3.0 m, 50 +rplxqzpcx5j1zgmt( vg6 0 a speed of 4.0 m/s, and an accelerationgz0+p (g5r z6q clx0jm vpx1t5 of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is on thsmx 9 fz .mq6-djvw6w,e middle shelf in the bookroom 1.3 m from the floor. qz-j6w9 m,m d6sx.fwv If the janitor relocates the box to the shelf that is 2.6 m from the floor, how much work does he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 wa+*:elk*gzzc h 3q)fo atts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/z: +gzh*o*eqkc fl 3)as (about 65 mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a bo)k*jnx/a h5 wdx moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the incline as it is beijw kh/5n)dx *ang pushed directly to the left with a constant force ofF = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the top of the incline.
What is the magnitude of the acceleration of the box as it slides up the incline?

  09.14: In the figure to the right, a box moves with2gzm/n+j ury 7 speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the incline as it is being pushed directly to the left with a constant force of F = 240N. The box, of mass m= 20.m ngzy27 +u/rj0 kg, has a speed of 2.50 m/swhen it reaches the top of the incline.
How much work is done by the applied force F to the box?

  11.30: Two cars travel to the right, each starting from rest, along a str5o kmo*c;v ;gxaight road. CarA has twice the accelercvmo 5k*;o;x gation of Car B. After traveling a distance F, Car A has speed B. When Car B has traveled the same distance F, what is its speed in terms of B?

  12.07: What is the net force acting on txvtksm;;h2cj21 :) 47/zrgp quvfgm qhe object during the time interval of the accelemh qcv7v t/zf 2: us;2gr1)x ;4jpkgmqration?

  12.08: Through what distance does the object move d3 gswll )ee* y f:a3;pezz0pu3uring the time interval of the acce03 ;*:ewzlp ufg se yp3ae3lz)leration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is chz8isu 4 ilfl9)ceupu .xf8l68t95 b qxq yi54wanged from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What is the change in the kinetic energy of the mass duringw f6.e88ll9 ilxquf4 s 595tyiixbu) c4u 8zqp this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speah1bs i49f;ra w(j s4red is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of the crat1sar (afj;h4ws4 i9 rbe

  94.38: A force F at an angle θ iiel)mc8n5 e2ooo -j: yt1wp. o+a :qlabove the horizontal is used to pull a heavy suitcase of weight mga distance d alo oeq) 5 e+a2ny cw-8l:.omi1 oljpio:tng a level floor at constant velocity. The coefficient of friction between the floor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an u m9d4: le+gy(kkp bw 6lw2y mqy1mfy.;pward force and delivers a useful power output of 0.10 w to raise a block q1k6;mwyy9l:we ykdgy(f lm+ 2 mbp .4vertically at a constant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of the Earth, dd6 xdcbg8 /7vthe gravitational force acting on the 1.00 kg object by the Earth does 10.0 J of work on the object as it falls 1.00 mto the ground, which one of the following choices bebc v7 g6d8/ddxst represents the amount of work done by the gravitational force acting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a height ho above a hard floor andbbf:p1 g4hyr*de6rt) released. Assuming *1p6)4btreyhrd:f bg that the collision with the floor is elastic, which one of the following graphs best shows the relationship between the total energy E of the ball and its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. Thon6cpnwsg15 p4o:w,dlj 0 e2fe driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimusep4l5oo06 wnfdjwc: n 2 g1p,m average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slowfuunz kf*(mo52y)z eeu)z7 ec w4sk:7s down uniformly until it stops. If the ball trac:*sf euy2kfz74u5 zu ke( 7mo)n)wezvels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but sc a)o;v b,tvocn72;d identical kinetic energies and the threeono)2 t cbvv,;7d;ac s following statements. Which of the above statements would be correct?
I. The one with the greatest mass has the greatest momentum
II. The same impulse was required to accelerate each cart from rest III. Both can do the same amount of work as they come to a stop

  06.19: A 60.0-kgball of clay is zn e8tl ju93m/tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potejn/9zelu83 m tntial energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationar g ekj;p*o-)piy concrete surface. ;ji*)k pgp-eoThe boy, of mass M, leaves the concrete surface with speed v and his center of mass rises a distance d to the highest point of the motion. How much physical work did the average normal force of contact (N) between the boy’ s feet and the concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH above the ground. The oils2 ad 2hs.a64(7tbx.ozk ir bject crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Assuming that air resistances(.t6i dk7r.ol24b2 ihsaa xz is negligible, what is the magnitude of the average constant force exerted by the ground on the object while coming to rest?

  12.48: An object of mass M is dropped from aheight H above the ground. The oos1 e.-6cuwj mbject bounces off ofwmuojc.- 16e s a horizontal surface in a collision lasting time T. The object then rises upward to a maximum height H/2. What was the magnitude of the average net force acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a bybjh +8nt4)n cord length L is pulled sideways until the cordn)ynb+4h tbj 8 makes an angle
θ with the vertical as shown in the figure to the right. The change in potential energy of the bob during the displacement is:

  03.49: A sled slides up a uniform incline of unknown angle. The sled, wfcjdfe80 8+bshich started at the bottom of the incline moving at 10.0 m/s, rises to a height of 3.30 m above its starting position and momentarily comes to rest. The s f+8 esfj8d0bcled then slides back down the hill. What is the sled's speed when it returns to its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, avkv6g5 gq-q m*long a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a mass of 25 kg, what is the total work done by the deliveryman on the cartons to move them to the loadig -5kvvgm *q6qng dock?

  12.16: A constant force F=50N (as shown in the figur4dkppxi5h25. py f-e be) is applied for the 6.0 meter motion of the box upward along the incline. The mass of the block is M=15 kg. Which one of the following choices best represents the-p 2.dyppf5x5kh ieb4 work done by the force F onthe box for the motion?

  04.48: Two identical bowlingfual4 dw715z,43y vghp wya7;*ac f au balls A and B are each dropped from rest from the top of a tall tower. Ball A is dropped one second before ball B. After ball B is dropped but before ball A strikes the ground, how are the mechanical energies ofuz1*a 7,34; auf plyfw7wdc5ag 4v ayh the two balls changing?

  11.28: A person throws an object of mass M straight upward with an initial kcp:w70: unnq non-zero speed v. The object rises to a maximum height H above theqn:uw:pk c7n0 launch point. The person now throws an object of mass 0.5M straight upward with initial speed 2v. In terms of H, to what maximum height does the object of mass 0.5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a bu)z8 ,x ) bzhhx64.tt1do mjaczc;5espring that has a spring constant of 20 N/m. The potential energy stored in the spmzxaz ,tt ;48hbo) d j ).5zcc6ubhxe1ring is:

  97.10: A compressed spring has 16 J of potential energy. What is the maxkpd ok(skro :6mi s+iidt6;yn+6 24 xuimum speed it can impart s:ny pk r6k++;m(4doisu t2x6o d6ii kto a 2.0-kg object ?

  

  10.31: An object of mass M sx zu74z/fel x:mb3;4bu9i oxw tarts from rest at the bottom of a fixed incline of height H. A person decides to push the object up the incline in one of two ways with an applied force shown in the diagram. In each of the trials, the object reaches the top of the incline with speed V. How would the work done by the person on the block compare for the two trials? Assume the same constant non- zero coefficient of kinetic friction betwee/4zwu 4ezl 9fx7umx;i :o 3bxbn the incline and the object for both trials.