97.01: A force F directed at an angle of θ above nd dv*7f- nd2nthe horizontal is used to pull a crate a distanc d2nvd-d *7fnne D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of masssqvt59+ ynka vi : xtv9/- 4jalaj()c)hhbn y4 m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, thtajc)l sn(qi /b-)xny vv94v5 ahkhj4:a9yt+e horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holdsg/runpo9vklltk 2ge r2 6/23 j a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 seclvgg ln3u tr//62o 9erk2 kpj2ondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides jmp j(7m wwbv*iu6m2. ,z9mon with uniform acceleration on a horizontal surfac 7owmj vinp(w zumm6 .2mb*j9,e 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 slides with un):5pogv;m 2.6s *ocd5qm qk9ou1 yy(mnfubmwiform acceleration on a horizontal surface for 5.00 s. The block’s kineti*sdqyyg)oo :mn95qu 1 (m5opm.wv26 k;ufmcbc energy 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 d 4pf)b mxfpd79 dori:2( 99d+e hbqoxnirected 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 hpd (: x +n9xf2 de)f4p9 b9diqmbhro7oorizontal 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 3.0 kg bloi-xoxsa nqrx r42jcft; k46o81mt e1 ;+jk, deck for 5.0 s. nkkt844+ jd c1rrx;6eq e mj1f-xao2isx;t,o The block was initially at rest and slides on a 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 froze v .sr/9 iejajku32q1sn pond throws a 1 kg hammer in o r3 esj29s a.i1/vqkjune direction. After the throw, the hammer moves off in one direction while the student moves off in the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows thzl(/ca 9(yv q79 jpfpu,gu/jhe air and gives it kinetic energy. An hour after the fan has been tpjuvygp9(7ljf cuqa/ h/9(,zurned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a lownm,3z55ip0( fo 6qu ;* vm0b:dmm3lmcuhtblock of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and0*qwu30dm3;bnm ih,mm5cu:f( 6ml tpoozvl5 an acceleration 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 the middlws:kw*twn 2) te shelf in the bookroom 1.3 m from the floor. If the jan*twwt:)2nws k itor 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 hors a5g6 kgmhtax9;ha5(lepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65 mph), what is the magnitude o 5;lht ax9hg5a agm6k(f the retarding force acting on the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s ad q30yi y5jcaal. aj)/*d6csp t the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top o)*y 6 3sad.cild qayjp/5c0jaf 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 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 ri eg *1)mm u8vu-robbqc. 4i6lqght, a box 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 being pushed directly to the left with a constant force of F = 24u1u.oqrm bq6) *ige8lb4c-vm 0N. 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 rig8.*mpq.9xx:eh v fpy( 4itex :ya4zvdht, each starting from rest, along a straight road. CarA has twice the acceleration 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 i f:a 48z*.xq.:exvdp9t (pv4mye yhixn terms of B?

  12.07: What is the net force acting on the object during the ti4sq vs.nwpow3e141lkme interval of the acceleratiwnws3 s4 lk.1 14oevpqon?

  12.08: Through what distance does the object move during the time inter c(,cuxv 24xglval of the accele(,cxug2c v4 xlration

  12.19: The magnitude of the linear mom1bf0pq5mq: 4g; sa hdmentum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What is the change im5 fdhqpq:s;1 mag0b4 n the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed:yd (.drxmv7x is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of the cratx vm:d(7r .xdye

  94.38: A force F at an angle θ above the horizontal is used to pull a ;;3k 7hjopihzheavy su 3hzj;7;ihpokitcase of weight mga distance d along 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 upward force and delivers a useful po3ew /( 6.bi7wbme ckvb:xd/n qf6dre)wer output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this cra mew dbe/. x6qkc)bi 3w:r 7e6/(bvndfne raise a 0.20 kg block?

  12.18: A 1.00 kg object is released fr. slstjt05ip5om rest near the surface of the Earth, the gravitational force acting on the 1.00 kg object by tht sijp5.st l05e 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 weioh:+ :fgrcr:h 31y lc;b,mis held motionless a height ho above a hard floor and released. Assuming that the cch: e rmlw;ryh ob13i ,c:fg:+ollision 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. The d 98 4y99vmg0ogpks iporiver sees a barrier ahead. If the car takes 95 meters to come to rest, what is th8 o4symiv9 0pg9go9 kpe magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving kdlc-nca ;d5 *at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applieda;5d*- c ndlck while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses bu xgc98v134j ta-o )plwlkf:e mt identical kinetic energies and the three following statements. Which of the above statements 19)m4kjllg pce 3tw :xa8o-v fwould 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 clay6p(siv c2n ev:ksed5v k+gs- ; is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when vg:p52 ssdevck-;es vk i(+n6it reaches its highest point?

  06.20: A boy jumps from rest straigh2c 36 vlp0j.yjt*)e7k c bfoizt 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 normobi )jc. fp0zt *6clv732eykjal force of contact (N) between the boy’ s feet and the concrete do on the boy?

  02.48: An object of mass M is droppet.6dscyp y dn .y8ta.hpa9 tdmpb6 e* b7:ty42d 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 ..aceymt tn:yd8b 9ad7 4t* p syhb6.6d2ptpyexerted by the ground on the object while coming to rest?

  12.48: An object of mass M is dropped from aheight Hei5fbt9u .*qc 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 the average net force ac c i*b95uqe.tfting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord y5x9 :mzx*bf. af 5hkklength L is pulled sideways until the cord makes an anglekxyam:h5.5*x9 f zfbk
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 ub4k zu/u(.pod nknown angle. The sled, which started at the bottom of the incline moving at 10.0 m/s, rises to a height of 3.30 m above its startingu /zo.(kb ud4p 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 cartons from the sidewalk, along a 10keh),0:wlvfvz j+pnkpi e;f .uh 1ow + ud++9v-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a mass of u :f,0+wk.pv9f++ oe jd;iwlphv 1 vkz)n uh+e25 kg, what is the total work done by the deliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is applied for the 6.bn81b4 mr ch4ec:41 iqgyou y5l)g.oh0 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 work donm qgho154bhycrou :yl. e4cb1 g)in48e by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped 3.:fyi uh.jvefrom rest from the top of a tall tower. Ba:e h3jfvu.i.y ll 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 two balls changing?

  11.28: A person throws an object of mass M strair:ssk)nww)h56e mu ;mght upward with an initial non-zero speed v. The object rises to awe6:nh)m w5 m)surs;k 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? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring c.qvursmh;zac 4 ngz4u31+f 8 uonstant of 20 N/m. The potential enerna1 ;z+. urucgqu fvzsm38 h44gy stored in the spring is:

  97.10: A compressed spring has 16 J of potedv na;bi s1 +/xa,w:qkntial energy. What is the maximum speed it can qavk,nsaw1 xb:di;+ / impart to a 2.0-kg object ?

  

  10.31: An object of mass M xujc 6( )66pvzwqjvk7kjh 04i starts 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 04 hk)6u j6ckvx7wvz6jqjp(iby the person on 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.