97.01: A force F directed at an aq ;efe 73hds1kngle of θ above the horizontal is used to pull a crate a distance D acrossk s3ee;71fhqd a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is(di2ydka8 * gg moving toward her with horizontal speed v. While bringing the bdadygi * 8(g2kall to 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 kilogrb()go/jp(w/ b -pkmrr am sheet of wallboard 3 meter abovrj(pp)br( bm/ k/-gwo e the floor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides +q+m /xu0atykxx,01kk fdtk+ 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 J in this ti ,+0qyxk/+df0aktmkku xx 1+tme.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides with 4oe3g gf, n 1jti:ejg9 uniform acceleration on a horizontal surface for 5.00 segjgn 49 t1,3:oie gfj. 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 to the right is exerted on 5 6ugdw*nj0ot.fk 5zra 3.0 kg block for 5.0 s. The block was initially at rest and slides on a hof0zjwg n6ok.*5dtru5rizontal 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*8m9ec,v w h0 p(y;n7sikv/wzugkh4w to 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 sump9h *hk7n w;k (s0v/wzw uv4i8gcye, rface.
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 throws a 1 kg/2no : trge+jydn77zn 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 corre er7yt zngn7+2 j:nd/octly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour after the fa rvs,xb7+ xs44apye3f n has been turned ofypfsvb, 73x ex+44s raf,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg4xr(q 3fn 3 pjctd+*ff has a position of 3.0 m, a speed of 4.0 m/s, and an acceleration ndqfr*3ctf (3+f4xjp of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old te +ui* y67kpbavxtbooks 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 kyv 7pb ui+a6*does he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 u ww2x 86 +dbq3jg -engobrdl )j2k3s1watts (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 tqsebb+) uo 63 gwjkwx23 gn2 l-dd8r1jhe magnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s at .hb6xd ,7 tyrf2zw/qqthe bottom of a roughzryq dh/627 w,fx.tbq , 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 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 bottorkx2/o/u zojwlywk; p )h.puv53h-i 7m 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 lekphu7p z oh ;u /wx)-j3i o/k2wvr.yl5ft 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 stard. xwf0s( piea1sa57nting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a dispa. aswf0 di e1x5(ns7tance 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 interval of qacbb/y(za.) g7e/m wue+ ez8t/w/m.yc+7ezqbaabe8 ge u z()he acceleration?

  12.08: Through what distance does the7jbb 8 fp0k67aveho6 u object move during the time interval of the accele e k676oauj h0vb8b7fpration

  12.19: The magnitude of the linear mrjx ; oclbm1j)lmh:k gp1hq9q57j- o 4omentum of a 4.00 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 change in thml1 jc jkqb9 o- hp:hj5mo)4r1gq7l;x e kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic55c :mbhprzj * energy while its speed is increased from 2.00m/s to 4.pjb5m5r z* ch:00m/s. Which one of the following choices best represents the mass of the crate

  94.38: A force F at afpt4j+ - qb-fwz 14 enivwqb)2n angle θ above the horizontal 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 and the suitcase is μ. The work do4 ebfiw t+qj-b4)2 q zfwnpv-1ne by the frictional force is:

  14.31: A toy crane exerts an upward force and delivers amuw04(tpy usq3*( mwv useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raise a 0.20 kg bt*m wqvy p0w3sm (u4u(lock?

  12.18: A 1.00 kg object is released from resm+x 3aywx ,ap5t near the surface of the Earth, 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 one of the following choices best reprya xx+pm5w,3 aesents 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 abovegt go*6p +jln bp)y;ji4e ve rnv;)9w2 a hard floor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relationship j i eot 9b6ly4n;gg+p)*j2) re;vnvpw between the total energy E of the ball and its height h above the surface?

  07.06: A 500-kg car is mo4f5l t/e/ibg. nuvrd4 ving at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to couni b5dft g/vr.el4 4/me to rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving a - urs5 rgt8tcrl,oxq9u s3,,at 15 m/s slows down uniformly until it stops. If the ball trave- xatsl g8c3o quu,9t5srr,,rls 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two lapr46-p xs. +gi 8obraqboratory carts of different masses but identical kinetic energies and the three following star8aq 4b-+xo.spi 6prg tements. 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 clj/i 8pleepx t q795e6day is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential enerpt x5li 76pdj 8ee9/eqgy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward n7qs*c d4(onmvm s3x+30g yhdfrom a flat, stationary concrete surface. The boy, of mass M, leaves tnh3sng (mc q04dy x+o7ds*3vmhe concrete surface with speed v 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 objecgpo9lcnz3b 6k ui25rj;1p 8c qt 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 magnitud5 z16l;i2gj8kcnu93 pc qr opbe 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 abovtsxp/j4fb32 (md0p xxe 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 force acting on34fp02b/ xdm(sxtxj p the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord 29yw4ppy/bq- q(g qnzlength L is pulled sideways until the cord makes a/ y-w(n2p9yq zqqp4bgn 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 u 8+mch(ivse o5i1* lin (1nkjmniform incline of unknown 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 comes to rest. The sled then slides back down the hill. What is the sled's speed whenmohsi +l8(*1nm (5e ivknj c1i it returns to its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidew w9j/ +eqhsi:.rzmw, jalk, 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 deliveryman on thw :m zhjeq.9rj/ ,+wise cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown ixif7ryh2(i ob,z m+iqt (1 (5ezs qr8in 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 one of the following choices best represents (txr b+iz (1io(yqh2r5 szef q7i8,mithe 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 from thea*et1i cs5y)wn2u1 qr top of a tall tower. Ball A isyn 2u)5 1a *sci1trweq 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 changing?

  11.28: A person throws an object of max7 uccxg gi5,45q( zldss 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 thq5uix x745( dcclg,zgrows 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 spring that has a s(2b0+/rr :ix3c /cdwkrpe tdfgu 7n(wpring constant of 20 N/m. The potent+ 7 r0i( bx w(rcr/n ktc23e/pwufdd:gial energy stored in the spring is:

  97.10: A compressed sprin egvpw6a5i+fx8yy cn88p ek6-g has 16 J of potential energy. What is the maximum speed it can impart to a 28f6+acg-5ewn x8py ye8v pki6.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottomp,ylh5 j,wof- 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 each of the trials, the object reaches the top of the incline withj 5 ,,ywlop-hf 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.