97.01: A force F directed at an angle of θ above the hora lneh; 9*6cqiizontal is used to pull a crate a distance D across a level floor. The work done by the fo*l hi q;e96canrce F is

  97.33: A softball player catches a ball o(;wrvcs.+x ji f mass m, which is moving toward her with horizontal speed v. While bringing the ball to vw +.cjsxri;(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 holds a 20 kwb9fv4w8qykhdb nw0.a : el. :ilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expe:hql bw.y dn f9a.0wkb4 w:8vended on the wallboard?

  17.11: A 5.00 kg block slides with v71 yn4-cvam+bbd9 nsuniform acceleration on a horizontal surface for 5.00 s. The block’s kinet cnv1 msa+ 4-bdbyv97nic 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 wiyh ns 9+ch3ij*7or; xbth uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases +3s n* h;i9r7oxjyhcb 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 ty9. jyrnz n*u9; ()hd4tgdc6e y mcc kql,;i8fo the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a hori69 *udzf . j4cy eqlk)crd n8,ti gyh(my;nc9;zontal 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 exertedwqk7of l*g8( y r+yj 8*vk 0et*vyrav; on a 3.0 kg block for 5.0 s. The block was initially at rest and slides ony+gf tw ; k kje0(avrlv7r v*yq*o8*8y 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 frictionlessgw:hhvieuq-/jfk)l6/ i b8t8qy k1w ) frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one-ukiw8: ek 8j/w1 htq)vfibh6 y)g/ql direction while 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. ryzz i.t+.1 l bw9 m;;vn9jmor An hour after the fan has been turnemj b nz+t1w;zmvl r9.9yi;.or d off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mask83(wew tyyb *umu1:fs 0.50 kg has a position of 3.0 m, a speed ofmeuyk uw(b813 w*:fy t 4.0 m/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 textbooks is on the middle shelf in th2(+cq 8dro xuae bookroom 1.3 m from the floor. If the janitor relocates the box to tcroq u8x+d (2ahe 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 delivert0boqh0 3sn1h s 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 acqonb 0shh01 t3ting on the car?

  09.13: In the figure to the right, a box moves with sp3qjqja xb+* ;ly;a 5o1 bsmti,g;.zuvl t;b8a eed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box sliviu ,;a5;81 tazqly b* qa+x;tm;l osjg3.b jbdes 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 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 b2(rq:le8jhbh6g iz+bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the incline as it i g(b ijh26qeb: 8hl+zrs 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 straitx rp;t-s8oo0:u.sa gght road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has o0 tp:asut;xor-g.8s 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 ac ;- 5ooedsc-znting on the object during the time interval of th ;-ds-oz5enoc e acceleration?

  12.08: Through what distanceot mpr1 p0xq1d-/gzp5 does the object move during the time interval of the aco pq/r1tpm15-pg z0 xdceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is changed,uri:ekg gij3ed5: gpg/e 33r 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 time iejp3er:/ ei3i5gg 3d g:u,krgnterval?

  14.11: A crate gains 36.0 J of kinetic energy while its y,ba41c,o( m ekpi8en/gr x.sspeed is increased from 2.00m/s to 4.00m/s. Which opoebm gcrk.n(y e1s,a,4 i/x8ne of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull:bwmu32.z wd/alpc 4gbx;b0vryq /ed,mh0 o+ a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor and the suitq .bavpm+:h ,w2g /yc4ux0 ob; blerzw/ dm03dcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward fyp vs;otvo 6g/3 ;*lf5oegd0vorce and delivers a useful power output of 0.10 w to raise a block vertically at a constaf;e/g6 5dg;vv 0otsl3po* oy vnt speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of the Earth, 4 kdfs;t2-xvgthe gravitational 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 1.0 svk-ftg4;dx2 0 kg object during the fall?

  96.18: A rubber ball is held motionless a height ho above a hard floor q n(hcgbx**o:xjq3d1 and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relationship between the total energy E of* goc:bn*3qj xqd (h1x the ball and its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver7l7.(kd jlh:8xgnaha *g 2y7 wr1auc f sees a barrier ahead. If the car takes 95 meters tl .l17(7ckdua g:aaj2* f hxn 8whyr7go 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 until dp8kbnf gz.o5 41zo 7vit stops. If the ball travels.41bdo 7zz vnfgko p85 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kinetic iu8elot;wv,i5s v.t 5energies and the three following statemen5u ise8tiv.t;lo5vw ,ts. 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 air with an ivnly lq.7)b q/nitial speed of 4.60 m/s. Ignoring air resi ly/7b)l qnq.vstance, 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, stationary concrete jj)t *f).h9a+ut,vd qgyyd g(surface. The boy, of mass M, leaves the concrete surface with speed v and his center of mass rises a distance d to the jj v+ hg)yyd)u,gat(fq9dt *.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 cyl(w .33jzhv 4p*fa/u*t hgyfrom aheightH above the ground. The object crashes into some soft earth t h.*a4hgc*z(y33ul/vf yw pjand 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 H above the ground. 3tv7 l3znyfw0u+e(p bThe object bouf l+ z uy3n3v7ep0bwt(nces 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 acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pullj s i 3.yy1jomhq*x1(ned sideways until the cord makej3y(1n *oqx.yjsi 1hm s 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 inclinedmk.m,8x9 8g/a4u9kim5c a y; r wqwog of unknown angle. The sled, which started at the bottom of the incline moving at 10.0 m/s, rise 9q8.caimg, 5 9oxw48w; kdkam/rgum ys 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,y6vtupful-7 : 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 deliverym7fu pt y:-uvl6an on the cartons to move them to the loading dock?

  12.16: A constant forws k z+;5l0gfwwkb*r+ qyr 8b4ce F=50N (as shown in the figure) is applied for the 6.0 meter motion of the box upward along the incline. The mass of the blocbk5klr8wfz r4w y*+w0b+;gsq k 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 bowll qpu,iv(no)0ing 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 grou(i0 qvuplo) ,nnd, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upwe9) kukt(pmz97jlt e0 ard with an initial non-zero speed v. The obje (tu7tk l0)ke 9pzmj9ect 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? Ignore air resistance.

  96.20: A force of 10 N stretches a s+e xifb.t,+ft4llr3k2.ay e fpring that has a spring constant of 20 N/m. The tex.+ 4l . k+tfe ,flyfri23bapotential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energ31mcm d7jwds- y. What is the maximum speed it can impar-d1w3mcm d7sj t to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the botqi fkkt;/c0m/ tom 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 i//fktcm qk0; 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.