97.01: A force F directed at an*z s *0sa/ldkg angle of θ above the horizontal is used to pul/kg zas0*s *dll a crate 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 sqs60n-qjgrb.6: 7 d1 qkd snom, which is moving toward her with horizontal speed v. Whil6rk.ds 6d:n7osn1qg qq 0jb- se bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer ho, v3 mkutvpzykc2.(d -jtwl123ipef 6lds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During the ,d(f-1pi33lt62uvj .vkt 2w y pkcmezse 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block/uih:bh9h a b f7-8wuj slides with uniform acceleration on a horizontal sur97h uub/h jhw f-i:ab8face for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block z 5bn7-my hzu/slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strz/bm7-hn 5 uyzictly 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 is ex 0f255qsxcnc7hb,l wfhq:q 7jerted on a 3.0 kg block for 5.0 s. The block was ini:5s 2h0,h q5qjwb7x ql cf7cfntially 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 force directed to the right is exerted on a 1k/1.7i2yzj 6 * ozzj7 tguqzvpfgnq43.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surfv4ipjo1uz7 . tzgz gkzq6/ j217yq*n face.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a frictionless frozenj,+sriw;h2;qd+ev, xq 8os sh 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 direction. Which of the following corr8j,we vo;q,;+r is sxd2 s+qhhectly describes the above situation?

  03.14: A fan blows the air 73/tqcz(sv. ci. fyqyand gives it kinetic energy. An hour after the fan hvys/f.y (z.7 c3ciqtq as been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.5ae;4 eormfvr42n0v*x 0 kg has a position of 3.0 m, a speed of 4.0 m/s, and an af0ov;rmr vae 4*nx 2e4cceleration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbo0 ssgibxval8 b.+5 0cwoks is on the middle shelf in the bookroom 1.3 m from the floor. If the js50 g bw+ix0cb.val s8anitor 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 watts (about 32 horsepower) .*z.;50hxip zey pnhrof power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65 mph), what is the mag z rxyz.p5ph h*.ne0;initude of the retarding force acting on the car?

  09.13: In the figure to the right, a box movesu+c*djx(7 svl 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 being 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 o+vs xudj (7cl*f 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 with speed 5.00 m/s at1fp7q(3seg9;uemu4ut h id,6w now8y 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 leftnus( y6 ,p7uu gfh1ieod w 9emtw8q4;3 with a constant force of F = 240N. The box, of mass m= 20.0 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 re4g g..hdknsbq wuy;6 0c0 v3j -mkni)est, along a straight road. CarA has twice the acceleration of Car cingv04 mnqk. js g);0hk6 -.yeuwdb 3B. 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 the object during the time interval lxq0xs4y:1vbc 5lib1 of the accelera0bi 5:v l 1lsxxbqy4c1tion?

  12.08: Through what distan/rh4 ogbxpt, hmpq )-)v7nymo h02qp 3ce does the object move during the time interval of thebm04p7 mpyptqrhhvx) g/2 - 3, onqoh) acceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass ijrl +f neg+vao .rhyb102fv7 9s changed from 6.00kg.m/s to 14.0kg.m/s in a time interval o2ln + 10jgo.yv7fef a9+r hbvrf 6.00 s. What is the change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 z.jwu/q)yh)1gku+ w tJ of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the f )j .+kqu/wgyzw u1t)hollowing choices best represents the mass of the crate

  94.38: A force F at an ann)hh a3gx- ds 1ot -sn3u6y7ohgle θ above the horizontal is used to pull a heavy suitcase of weight mga distance d al - h oa1nhtgnsohxs- 3y)3d6u7ong 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 upwaremu0g56sk )re*5lz ejd force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will thi l6 5re*0se zm5jkgue)s crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surfacwz;+ lh,38(qixcx83l25li kg vka jx ve of the Earth, the gravitationallkj c2 lilwg(qk ;i83a,h3v 5x v8+xxz 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 best 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 hao6ys 4f8z ;iweld motionless a height ho above a hard floor and released. Assumin8fozi4 s6 wy;ag 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 kk,onra.y/35z i4ue dat 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rea y/rzi,ukoenkd. 3 54st, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s sl8mptdk-o 2a.vpreqw08 e 1 no;ows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while o 2oep a 1ep80.8dvrw- q;ntmkit was coming to a stop?

  02.26: Consider two laboratory carts of different masses but stfp1b2maa ,o -u6hr; identical kinetic energies and the three fohab16srptm,2uf o -;a llowing 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-kgballm1x g(xq :8bkm of clay is tossed vertically in the air with an initial speek x:g8x(m m1bqd of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straigi(kfoy --*)l;y f.aysacr l,yht upward from a flat, stationary concrete surface. The 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) betkyf*(ya)slyac.r,l y -f-io ;ween the boy’ s feet and the concrete do on the boy?

  02.48: An object of mass M is dr2k/tajg x n+1aopped from aheightH above the ground. The object crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Assuming that air resistance is negligible, what is the magnitude of the average constant force exerted by the ground on thej1ag tak2+x n/ object while coming to rest?

  12.48: An object of mass M isayi0a;69cn ds wg t2c6 dropped from aheight H above the ground. The object bounces off of 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 tst6a;n ygi6 0awc c29dhe average net force acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a izf*b16g8 .eb3o u;7njaguz wcord length L is pulled sideways until the cord makes6 1gw3b u iuobja;f*ne8zzg 7. 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 sledinv, m23iynw+, which started at tnyi n,2vw+ m3ihe 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 sled 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 car)db2lk)4xezs+7w ohw tons from the sidewalk, along 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 tsz)+ed lw2kw)47 hbox he loading dock?

  12.16: A constant force F=50N (as shown in the figure) is appli*.2 7sty,grvfy veen/ed 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 reprey *2egvsn rt.7vye,f/sents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B aecu7zv3k1 r2ore 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 of the twv2k1r zecu 37oo balls changing?

  11.28: A person throws an object o70bf woo3gp01-cjdu df mass M straight upward with an initial non-zero speed v. The object rises to a maximum height H above the 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? p73ug01f ddj-bwoc0 o Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring constant of 20 N : .iherrj+6dh/m. The potential energrdhj6i +e: rh.y stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is sybz9o,l w8 y)the maximum speyyo98z b)ls,wed it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starth aik b9k)ioj)6pe5 h,s 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 bpi)9he5 i j k)ko,6ahon the block compare for the two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.