97.01: A force F directed at * kaw29vd dpp2ueu ,so( n/,bran angle of θ above the horizontal is used to pull a cratev*s ,oaunekp /( w2ddb,u92rp a distance D across a level floor. The work done by the force F is

  97.33: A softball player catch)u5 t aux 9p+ c+z,8wnjiah1cyes a ball of mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assumihi15 npju xu8wy9a+ a+ t)c,czng constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kil*oj v yheyffp 8 7jwp.unr2.s ,-qb4pgx+2o: logram sheet of wallboard 3 meter above the floor foyp p,gprjw-o7hev:los4x2+yjnfbf* q . u 8 .2r 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizonta3dj gget :ha:4l surface for 5.00 s. The block’s kin:t gjh:gea4 d3etic 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 uniform acceleration on a horizontu8 nb mb;81npgfep yc8i)w(r to,6 c1aal surface for 5bf1w tb8)cncg(r ; ,me18y86paopinu.00 s. The block’s kinetic 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 directed top1qqj2i u eg0+ 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 surfq 2+jeu0i1 gqpace.
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 tiaap3kyt17 ,q.5 by nkhe right is exerted on a 3.0 kg block for 5.0 s. They7y qbt15akp 3k,.nai 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 fp-5n5*ngudrh rictionless 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 followinug* dh-r5p5n ng correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour acfwiotj))jn 4s nt*es8:f3-cfter the fan -ft8on)cj i) c4sefwst:*3jn has 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 posi g rcgj18ubh-o3z4rcug me747 : mtwc;tion of 3.0 m, a speed of 4.0 m/c4g gj:z u rgmb4me7;c1 3utoh8c rw7-s, 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 tem8;w:l5y vib4oy b 8kgiyonh -3lkx(:xtbooks is on the middle shelf in the bookroom 1.3 m from the floor. If the janitowol8xyn 3yh ;vk -gy4bko(lii::m85 b r 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) ofyo kw8+;wzft : power to a car's driving wheels. If the car maintains a constant speed of; kwf+tz woy8: 30 m/s (about 65 mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the be-/ vg;zu bi:right, 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 ofF = ;uigvz:- be/b 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 with speed 5.00 m/ye vu 3i g*bfzga5w;dylg/ 2*im+pj79 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= 20.0 kg, has a speed of 2.50 m/swhen it reaches the top of the inc+dbj 3wg;52* pigm 9v uyy/ea7zl g*filine.
How much work is done by the applied force F to the box?

  11.30: Two cars travel to ,wj4 iuk.tmc7the right, each starting from rest, along a straight road. CarA has twice the w t,ki umj4c.7acceleration 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 thed wsi0 v3:,o(raaqho2 time interval of the accelw0s: hi3q2(avoo ra,d eration?

  12.08: Through what distance does t nokm5q(is) q8p 6no7yhe object move during the time interval of the acceleratii)n5s8(oy np o67mqkqon

  12.19: The magnitude of the linear momentum of a 4.00 kg point m* 3 infl sbd-ra 3).cgr;0diakass is changed 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 during this tl- )0rr da*i;n.ifs3g3c db akime interval?

  14.11: A crate gains 36.0 J ofm4c-nd m7a( m;q..*ev wullrm32em pp kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represlp.mrmn*m dwev;( 3- 42u7mmclpeqa. ents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pulkp9l-ru s f7y*akw6l.l a heavy suitcase of weight mga distance d along a level flo w klpasruf 6.-yl9k7*or 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 :vs9tvxqu u.9delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raissq 9:.vvtxu u9e a 0.20 kg block?

  12.18: A 1.00 kg object is released:klhipxa09cu0 w kss21z3zz ( from rest near the surface of the Earth, the gravitational forclc13zw (iskzh:2zx0pas0 uk9e 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 held motionless a height ho above a hard floor afo 1 d5vbhif2(.uzpg u0u i0(bnd released. Assuming that the collision with the floor is elastic, which o5ubi 2 fhiopb( vg.10(fdu0z une 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 driver sees a barrier ahexr0qbs y102 cqi3w(-teebm g +ad. If the cm-b+bqwycx2ee0srq3g(1 t0iar takes 95 meters to come to rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly und sny ll+u0k;.sksa ,b b4vzjj: n+.d/til it stops. If the ball travels 15 meters, what was the average net force applied while it was comddj 4lk.s,+:/byv +0zn.na ;k uljs sbing to a stop?

  02.26: Consider two laboratorri cpq(re33 m6y carts of different masses but identical kinetic energies and the three follqc33e rm(rp6iowing 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 -96qfpuuai r6qw vq,7the air with an initial speed of 4.60u uf6qvqarw-p7,9qi 6 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 straight upward from a flat, stationf7p4r7vq;980 dzgcap2gw y ka+:iqi s ary concrete surface. The boy, of mass M, leaves the concrete surface with speed v and his center of mass rises a distance d 9yi8: aq+kc4wz;gd g7prfq7i a2sp0v 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 dropp4c+f bv( :lo yvdam(enc9s59med from aheightH above the ground. The object crashes into some v9o fb4 yd9( nmas elcc(m:v+5soft 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 object while coming to rest?

  12.48: An object of mass M is dropped from aheight Hmc7 1: zciuxa: 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 fo1 za: 7x:ucmcirce acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a corxoo*33kz:pp xznj ; 0pd length L is pulled sideways until the cord makes an angleoj0:n;x*xpkzz3o pp3
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 sle*:2kh.uiggt8j 7u 5r h-zdzve d, 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 comes to rest. The sled then slides back down the hill. What is the sled'hdiugrv th7j 8ek 5u:2.z*-z gs 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-meter2 (djkm;jjj+i ramp to a loading dock, which is 1.5 meters abov j;d(mjj2jk+ie 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 loading dock?

  12.16: A constant force F=50N (as shown in the figur ux1 d i 5pwxa*6a0jndw1ux(;ze) 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 work done by u jx(zxwdw;d a *a60 i1n1px5uthe force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each droppe7vp rk24zch(rt/;lad d 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 mech2r( tah;7/4vdzl rkcpanical energies of the two balls changing?

  11.28: A person throws an object of mass M stra;: -zg 7kzh 72w) fpm,8kwwtfge8)zk2kvqco xight 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 heig 8 8vho2cxwz,fq)ek) t:wg 7g7 z2mwf-k;zpkkht does the object of mass 0.5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretchesp )+frnn8 ca/k a spring that has a spring constant of 20 N/m. The potentifp) /ac+k 8nrnal energy stored in the spring is:

  97.10: A compressed spring has 16 J on9snzx 8s+ tw v5,ovo5f potential energy. What is the maximum speed it can impart to a 2.0 sosz owv+nt9n5x8 v5,-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incline of+h z0pqpzcl *- height H0 zpphqz*+-l c. 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 between the incline and the object for both trials.