97.01: A force F directed at an angle of θ above the horizontal is -j mq.pc3efix0gpew 15d)1s9kyxs-o used to pull a crate a distance D across a level floor. The work done by the forcewmyx g.--s 1f dp9ik )seo0 qj31expc5 F is

  97.33: A softball player catches a bah;ds r s,lprdd*6;yz:ll of mass 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, the horizontal force exertedds ;:;r,d* dpyshzlr6 on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wal-8.sjtw t- ns us*vu,jlboard 3 meter above the f s-j8tvn*wt- s.j,us uloor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acm42n-jw bad w k64 +uuu7ww,cnceleration on a horizontal surface for wum-u awwd,bnc+u247 wk4jn6 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 unifx09p2) d2cuq-ouru 1,q 57rncmhren lorm acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this time.22)ruqcc7dpe0m9u1urro lxhn-q 5, n
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 direc j+b(i+lwse vt5w8st( ted to the right is exerted on a 3.0 kg block for 5.0 s5w ((bwt+vt+8sli esj. The block was initially 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 3.0 kg bloh)n:l3 . th(a2p,lq guytb-zx ck for 5.0 s. The:3t.(n -)xapb hh,yl qgul tz2 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 frozen pond throwp3y:wm5t nz t7s a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction pm 7:wnzt35 tywhile the student moves off in the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour after th;*oz+ cukr1;f odra,i: t1wh el 52f8jon;q wge fan hao1;ik d5 h;8oag2 rrwe*n 1,j:ltoz;+wf cfuqs been turned 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, a spr(sdx/s) x7uzgxg7r5a ,nww2eed of 4.0 m/s w7nx7(z,gga/)x d5rusw x 2rs, and an acceleration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textboo r.elv p p).-xg xx:sp6hmc;f308wlyqks is on the middle shelf in the bookroom 1.3 m 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 -qvr8xxgw c.xml:0ye3l 6)pp s;h.p fon the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine dqgese39uaswkih 8p o 93;:a- delivers 24,000 watts (about 32 horsepower) 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 of the retarding force acting on the car?hadoe3-9aps isweq:3 ;8gk9 u

  09.13: In the figure to the right, a box moves with spec6l chy2n 3q0qbx,jx ;ed 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/swhnq0qc xhl,;x3cb26jy en 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 rika7cd 9r(.g;dmx0 vl z0zkf0 kght, a box moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The blcmf0k9 z7ka0kdx0gd z;. (v rox 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= 20.0 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 rest, along a straight rhhl 6u7r cq( u i*:(1ctyvooq(oa yo:o61 ( urv*h uhqc(7cqlti(d. 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 terms of B?

  12.07: What is the net force acting on the object during the time ins7v82)y am2r0h gixasr12js bterval of the acceleratib)rs1y2hx80gsj 7r a2s2viamon?

  12.08: Through what distance d l:bo1ei ,-vcgoes the object move during the time interval of the acceleratiol:c g,e vo-b1in

  12.19: The magnitude of the linear momentj-g,k3g fhq dn*jqxb -) rt7u1um of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a timu- krj f*x)13bgqq hd t-7gjn,e interval of 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 J of kinetic energy while its speed is increased fk.7qrj6 vok ncp)s+avdev94 //yhxj -fm12 gdrom 2.00m/s to 4.00m/s. Which one of thvo1scakjgy- d/qvdjv7.emx 6+)f kr49 p hn2/e following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pullkn: x7 vwwb-)y a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor and the suitcase isw-xkywvb7): n μ. The work done by the frictional force is:

  14.31: A toy crane exei (zf+sy*xhpc* 8zk;krts an upward force and delivers a useful power output of 0.10 w to raise a block vertically at a const8+( xfsz*ckz yk ip;*hant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is releasxoh7zyhz (b c2n rgj3/ +a5rs(ed from rest near the surface of the Earth, the gravitational force acting on the 1.00 kg object by theb2 rs3hjrzn5xa 7z/ go(y(h+c 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 bal *j/rtft eli9/l is held motionless a height ho above a hard floor and released. Assuming that the collision with the floor is elastic, r l9*/j et/tfiwhich 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.gt/ds/mhs*1,d bu+ ;i d bs.bs The driver sees a barrier ahead. If the car takes 95 meters to come to rest,giddssb/b1h s bd*;.,s+um /t what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at imz.m 4o,lrrhw7w5s1 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applie4 71 wmirm5z wshrol.,d while it was coming to a stop?

  02.26: Consider two laborllt ijo jr*6+stzto(+ 3p1q3 jah0e(matory carts of different masses but identical kinetic energies and the j(r+zi3t 0qj*3hlt1+6 e ma s( oltjpothree 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 tossed vertically in the a083uqf b cljx6h+h28bty p dl.ir with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when itf80hh28dcu ypb .3l +xjqt6bl reaches its highest point?

  06.20: A boy jumps from+q,,8q,ct jr .iio chtwva(2a rest straight upward from a flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface with speed va (ch,qwv2c8ijtr tiaqo+, ., 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 oe1 4c/tem 6wdq /h6b cpk-a.gqbject 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 the ob - c6dcagteq1q/h6/4. mekpbwject while coming to rest?

  12.48: An object of mass M is dropped from aheipwygpc:i(h(3k.zzekrsfjg xh8 - 9:4 ght 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 w : c9yppsx:k-g4.rzj(ekwifz g3hh 8(as 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 lengavg*xn o3 edrf v/4up:qcx48 -th L is pulled sideways until the cord makescndx3q 8pf-x g*4a v o/veru4: 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 unknaf;j4vj:gfxc4 xb*b+ own 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 starting position and momentarily comea fjc *;j4:xvf +bgx4bs 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 10-f(q3uurca6 h: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 thufc( 3a6:uq rhem to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is applied for the ;gu0jvppko4 fnxog7*13 *mekd.p5 (aj dz j*a6.0 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 wouga vz17 *.4mpodna jx p(j;*0*3jp5gekfdkork done by the force F onthe box for the motion?

  04.48: Two identical hiz/+ ahcn 3bqg8.7t3 k9tle dbowling 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 of the two balls chang3tql/ dezki8 +n3t9c.h b7aghing?

  11.28: A person throws an object of mass M straight upward with an initial 4ao( n isxg06z7fle4 rnon-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 obj( 0fazn o47risle xg64ect of mass 0.5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stre*fnv6s/f-cr1 l,ampx tches a spring that has a spring constant of 20 N/m. The potential energy sto nv-alc/*rfs6p,mx f1red in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the maximsq-wu) wgf7(zum speed it can impart to a 2.0-kg o q-wgsfuw7(z) bject ?

  

  10.31: An object of mass M starts from rest at the bottom of a fsuf:0hc:7cpz7;vl im ixed 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 speed7lp ;ih vm7zf:su:0c c 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.