97.01: A force F direc qv :l,ipy3xykd5a1+wted at an angle of θ above the horizontal is used to pull a crate a distance D across a 5xyw i: lkp q+d13v,yalevel floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is moving toward her wcm/1 8 dn :ffv7ghb:sfith horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, th7n hf1s8/f: gf bmd:vce horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboarpms3pp/f2*fn d 3 meter above the floor for 4 seconds. During these 4 secondshow much 3pnm2p /fspf* power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on tpa7l 22wezny5dye+w,zl/ bakg 2h ,5a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases frogaezlanzwyh7k52y 2t,2d/ b w,e p+5l m 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 uniform acceleratiozmyc5ve vf7,/n on a horizontal surface for 5.00 s. The block’s kinetic energy strictly 7e 5/vf,v cyzmdecreases 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 exerted on a 3.0 kg bloc 0k) x2aqh83mmy z(dhfk for 5.0 s. The block was initially at rest and sli x fyh3mq)h 0(zadm8k2des 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 txbo6r wk*8 kd *kp-j5po the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surfacr-k *x8dwobpj6*5pkk e.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initici,cj 8f kk-+pally at reston a frictionless frozen 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 follj+pkf c-i8, ckowing correctly describes the above situation?

  03.14: A fan blows the air and givjd d3eb:q,(z:(cc qrpes it kinetic energy. An hour after the fan has b(qd3b pec:(rj:dq zc,een turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mas:uc72u +j+htgozto0)avez 1 rry 78hbs 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an z yr0 a2rto uju:e7+vbhcg7tz1 )+oh8acceleration 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 middle shelf in the bookroom 1.3 m0s ;xch ;bg8zlh4p6gww j:pz5 from the floor. 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 kw5wsp h04l jzhc x:b8z;6;ggpg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepower) ofo.,e0 l-j ub.fcvdgf7ltk4 f 1 power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (ab 0 l4u.tcv.jdobk7f- ffgl1, eout 65 mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box moves with speed 8 we7q67/ xb.sfzolml 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 of the/m76le l f 8swq7ox.bz 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 at the botzx 2r0j7x* +ozn ar;httom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the inclinh+ojrzaxr7 2tz; n*0xe as it is being pushed directly to the left 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 staro b904wvqx6u :o u unzv1:ha3wd4zj7hting 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 in te3joq b: uw u9 advhwohz164vnz0u4 7:xrms of B?

  12.07: What is the net fo *dzr oy9dd9k/m mql2;rce acting on the object during the time interval of the accelerl* m dmky9; r/do9dz2qation?

  12.08: Through what distance does thkf9c 1jku6. vd7pit -ce object move during the time interval of the i.91 u kckc6 p-jt7vdfacceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is changed fif40i*+ktu mciam5u) rom 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 mastfi*a m+5 iciuk)04mus during this time interval?

  14.11: A crate gains 36.0 /jdh5z2f -d cup0 d44mkkyud4J of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices / -0d4 jcmuhd4kz5p4 2dykfdubest represents the mass of the crate

  94.38: A force F at an angle θ above the horilnt,br 7(;g(-la aq as pkpk7+zontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor aa kbp7( +lg,;an-7q(klpstarnd 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 power out q(md3lqp u,muql9;+oput of 0.10 w to raise a block vertically at a constant speed. At what constant oq,q(d uql lup;m+3 m9speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object 2 em.d78qzt7kmu xf8sis released from rest near the surface of the Earth, the gravitational force acting on the 1.00 kg object by 82fsuemx8 k7 tq 7dzm.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 /54zq rof ;abi 15hwueis held motionless a height ho above a hard floor and released. Assuming that the collision with the floor is elastic, which onor4hquf ;i1ze w5ba5/e 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 dre t1 5,hfk-mqj g;d1bliver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magj-kd g1 ef qml;,hb51tnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slbmd owk* 27tp) 5dbli62cqbl2ows down uniformly until it stops. If the ball travlq2c52w7bb*po 2id k d6ltm)b els 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory cartskm;ws52kv /6 ncehqb+ho+x6o of different masses but identical kinetic energies and the three following statements. Which of the above skm hb;5osk62vwo6 q/ cneh++x tatements 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 tossed vertically in the air with a wsva 2 ,cayk0hmi)-qnq:72xrn initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential eneq)7c2aaxq wr,m2h-vk n0:si yrgy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward fr.+ ljed/5/fetzio s k6om 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 mokej/6sd /lze tf+5.i otion. 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 tx ;refnepr 8314 a)w-pc(nomhhe 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 mnwf)xr n14m;a 3-e(h8epor c pagnitude of the average constant force exerted by the ground on the object while coming to rest?

  12.48: An object of mass 9d( mcig) dq;;3kfxxe vt6 n.h-s 9ik ivi+i8kM is dropped from aheight H above the ground. The object bounces off of a horizontal surface in a collision lasting time T. The objeccfxk9q3k8tmdhe;+6i . );9ixk g i(dnvvi s-it 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 cord leni 0wer )d- 4rppw/0krwgth L is pulled sideways until the cord makes an )/ i0rrw0wep-wp 4kdr 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 ik lo.fcp lw6,yezr ,34ncline of unknown angle. The sled, which started at the bottom of 3,e4wozy lkcl ,fp r.6the 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 cartons from the sidewalk, alon 46us2wt4z.3ie)xdi pw 1z nfsg a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a mass oenwz 1xf64dwstus4 i).z3p 2if 25 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=50+zzmsicqm*5gd;;* s qN (as shown in the figure) is applied for the 6.0 meter motion of the box upward along the ic zi5dsz+qgq;;s*m* mncline. The mass of the block is M=15 kg. Which one of the following choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from rest g-p7q;8pgi ohz j-irwj (q- w/from the top of a tall tower. Ball A is dropped one second before ball B. After qq ih-87 gz-jw -/opw jrpg;(iball 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 e s bz tj9j-.7qc qfy++xdjuj2q6p 8d6z;k9pbstraight 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 initiat 7e9qp-x8qq u + jkby9;zfjjdz+jdb .p 66cs2l 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 constant oalqj -2h2b,vfj.y ( lz4z :pgcf 20 N/m. The polvqzyb2- 2jgzc(f ,4pjh: l.atential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the maxim yw*8 5 eo9h loi(x5 -45tziovoj(dwsaum speed it can impart to awiwx 59yetv- (o4o(s5i lz5dhoja 8*o 2.0-kg object ?

  

  10.31: An object of mass Mrg5tj0 0r ldk9 starts from rest at the bottom of a fixed incline of height H. A person decides to push dg05 tk0rjlr9 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 between the incline and the object for both trials.