97.01: A force F directed atcr 6- - vwggjwpi8(uu1 an angle of θ above the horizontal is used to pull6-c vg(rg18-wupiu jw a crate a distance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of+k ko,cgr9s p0 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 exerted on o 9s,pgr0+kkcthe ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheel0tdd yhei9gf 8tp: 8/t of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much p08 tpfi:gh/ l8tdy 9edower was expended on the wallboard?

  17.11: A 5.00 kg block slides vq)tx(y* mon +wwl- zoa/ 9 .b+pa:sda with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.a wp(x ay/v sa bnwlo o)-+zt:9dmq*+.0 J in this time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg bvpj1 7+pno 5rclock slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J7 von+p1r cjp5 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 exerox e/ y7d1 ib,u 7c*j)f8wlddwted on a 3.0 kg block for 5.0 s. The block was initially at rest dfwl yj,b7d ix8wc7/)d o*eu1 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 3sn3i tav19 ,ew.0 kg block for 5.0 s1e,vwitsa 3n9 . 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 initiallyu n15 xeth n8k ,)94vvsgwm(0o(hf qdj 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 following correctly describes the above s0(o fshvn, mh89(4tq 5euxk dgn1j)w vituation?

  03.14: A fan blows the air and gives it kinetic energy. An hoc x (f;*wtlb.td7s+ czur after the fan has z*tdx7.t+b ( s ;lccfwbeen turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 ka;w) cndq o 8na;0-ulng has a position of 3.0 m, a speed of 4.0 m/s,)ncnq-ua n0lwo8a; ;d 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 the bookroomle9/,pu: u .,(yewrj7qkuho b 1.3 m from the floor. If the janitor,l/ 7kypwr, h. q (9b:eueouju 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 wat-79 lg:jfa hhats (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant sjah: 97-halgf peed of 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 right, a box moves with speed 5.3x4tt-mts-w e1+1qp ugn :pf g00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant accele t 1-ntg3:mu +w-egt p4pxqs1fration 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 spei +,:6umlysdk ovmv8*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 of F = 240N. The box, of mass m= v6od,k : *lu+vmy8i sm20.0 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, al twelodd/ s 9069s2sbk:5 cpt ev)b;yrong 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 d t929ry:k6wtc ;sdl/b5p)eveo ss0 b distance F, what is its speed in terms of B?

  12.07: What is the net force acting on thepgkww+1ej *5bjzk8*; of 8lof object during the time interval of the accj+eg bwf8okl w *5z1p*;fok 8jeleration?

  12.08: Through what distance does the object move during the time interval of th g2n+(g4+jmbcl ane)t e accela c+mlt4n+jg(g)neb2eration

  12.19: The magnitude of the linear momentum of a 4.0)xj4mrtu va f6.la g290 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 chanvlj)xa4utm 6a. r2g 9fge in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J o.7d v.lzz qxa9 z d yzd4)x29sg2por5df kinetic energy while its speed is increased from 2.00m/s to 4.00m/ 9qr.457o). ddlxd2 z9dgzavy xz2pzss. Which one 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 pulll y;v -/o2bf+ eg3fftp a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of frictgfp ;o 3t2+flyfe- b/vion 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 ;b cxq,vk3; oc ol)v 2qfcs//da useful power output of 0.10 w to raise a block vertically at a constant speed. At what constantl/)od; vb s,oxf23c/qc;ckvq 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 w3wkpku(osm1wqqz59cb :mv1 i;:ak 1 , the 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 oc5k:1okwsa9 im3z (qvwu mk :11bw;pqne 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 motygbo yf y4-h p1t.d+)/ycpcf7ionless a height ho above a hard floor and released. Assuming that the collision with the floor is elastic, w4-d ytb.og7) cfpycy p1/+fy hhich 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 m5zgt(ua+nlt +pw)d(bd wh 5 rtz v);,hmel6f7/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnit (6nm5uf) ltr75zb;tv g+,lh+zdtpdw(ew)ahude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows dod2 lh2n;;pl rrwn uniformly until it stops. If the ball travels 15 meters, what was the avlr;hn;ld2 pr2 erage net force applied while it was coming to a stop?

  02.26: Consider two laboratory c;o7598;cez 6)d6 q4nm e tszu rg rdr2cbot4rzarts of different masses but identical kinetic energies and the three followin d;t4s2zr8mbtc9un5q rrcz 6e ;76)d g oor4ezg 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 vertic+gq-im l.lu*dally in the air with an initial speed of 4.60 m/s. Ignoring air resistm.+ -qdg*l liuance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upwar 08 bz3 vsl2j,py/vghod 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 l/g3 p,vo2bv8syz0h jdistance 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 u4gw9;po7(ooafnrj0*y8rhk . The object crashes into some soft earth and comes to rest by compressing the earth a d*j g(4 y 7pan u0kwrhr9;ooof8istance 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 abovd2ydgp 59 zv ksdqy(fn14tb-0e the ground. The object bounces off of a hord2n pz5(0 gb-ddyqts9 1y4 fkvizontal 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 pulled sideways un2q mp;ib.l/,j0k cmuh v,p(vdf(7 +ystsn*xg til the cord makes an,c (bfph2x,/npmvs ti( .v0g*qjl+ um ks7;dy 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 unifu7w9 6 s,4 5vzorge* 0obrvvknorm incline of unknown angle. The sled, which started aw6*g4ku9obeon0zs, 7 v 5vrr vt 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's speed when it returns to its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from t.yw+kxl0u s,phe sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a massp y.+x,uk 0lws 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 sho0mog8 v5b-iw7zbq +w2 (vee zcwn in the figure) 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 onb0 c(7ebvqwg -wme2zz+v o85i e of the following choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bokrs.1ih 5( jghwling balls A and B are each dropped from rest from the top of a tall tower. Ball A is dropped onek 51r (jihgs.h 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 of2mnebqbb h+03omri+d24 jj 7x p+jaw/ mass M straight 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 ofd3jpbmejwa hi0bnxbo r4m22 7+ /+jq+ 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 sprin7;j etgxz8xl3g that has a spring constant of 20 N/m. The potential energy stored in the spri; 8t xxj73lzgeng is:

  97.10: A compressed spiq .j,+yk(migring has 16 J of potential energy. What is the maximum speed it can impaq( k+j gm,iyi.rt to a 2.0-kg object ?

  

  10.31: An object of mass M starts from;6g. s3zpu bcv 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 di.p6 u ;bzvcs3gagram. 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.