97.01: A force F directed at an .8g b d,p4anwom2 k)7wak+ubyangle of θ above the horizontal is used to pull a da.pyk ,2gu)7wnkmba 84+bwo 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 mass m, which is movingvy l.j0s +v+ps toward her with horjsy v+sv .l0p+izontal speed v. While bringing the ball 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 labohzea . 3p(w*ztrer holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondsho3zwz(hpa. *tew much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a l9liut(09ig v horizontal surface for 5.00 s. The block’s 0iu9tg (v lil9kinetic 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 bp7g* t rjbvfn c6l*q0yis 0j7to:3ow1lock slides with uniform acceleration on a horizontal surface for 5.00 s. The blj yl*s7nc7rgjop10tbi*v wf3 6o0:tq ock’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 exe-egx*6 kqja o56o-tod rted on a 3.0 kg block for 5.0 s. The block was initially at rest andoeja6o5g*-- k d6xoqt 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 forceaz7d6kwc 7gq 5,*5db2 ftnek5 b9ksup directed to the right is exerted on a 3.0 kg block for 5.0 s. k5 97agz6bd p*2w us75cdt nk,kfqb5eThe 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 frictionles3b5a e0n h68gap)l nvqs 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 followi8 gv)b6lq5ph nn0aa 3eng correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy.7gc.( njb,/wm5 r ofu f0yxa*8nzlx,v An hour after the fan has been turned off, (8,/ofm a 5 n7y0b,wxl urvf*cn jxz.g
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,o fpgx b1ydo(2 j/u*t p;vjd82 a speed of 4.0 m/s, at;fo/vd2 bpju g1pd82*xj(y ond 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 bookroom 1.3 m fi3s48s:iwjz(dh /v avrom the fvi4:d3jz iswa( v h/8sloor. If the janitor 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 wwouf2x)p p k uhx6ws/wb8o+0(atts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 uow8 u6 f +o)pxkws20xbp(/hwm/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 movesik+a-69 puzbzmq(o v* with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acb-6qvzmk(apu o* 9iz +celeration 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 thebr r7tk2p3)p q bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the incline as i7tkqr p3b)pr2 t 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 smx)9f 5(/m intbr6m zxtarting from rest, along 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 sa 6xb)/rmt(fx9nm 5izmme distance F, what is its speed in terms of B?

  12.07: What is the net force acting on the objece16qrol 0:snst during the time interval of these0:s6ql n1or acceleration?

  12.08: Through what distance doem :a99qrj 9kchs the object move during the time interval of thmqk9 9h9jr:cae acceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is changkw2w0/ tbnsy+ni)lzq.l+ s 6h ed 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 durinb s./q)wzw20k6hi+n yn+slt l g this time interval?

  14.11: A crate gains 36.0 J of kiqt9g0 nt)3 vj t edd39:f9khaanetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents nj9)v:tah da0 qt9f9d3k tge3 the mass of the crate

  94.38: A force F at an angle θ/cyuvek0 xyp.8 gn*q0 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 floorq/ *epv.gc uxk 00y8yn and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force and delivers a useful power ou1s*0r+: edla9kzg-r7q w pbfutput of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane rg:wl1ukqs0zapb9f 7d +-e*r raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of the Earthytm zh s15my 9da)84bm, 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 z5a y1hm)8tsyb4d9 mm1.00 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 heit2o7 d4jpfp+1 cq okeg9x6(wm ght ho above a hard floor 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 the ball and its height h apq tjgmx1(k2 o69f+pco4we d7bove the surface?

  07.06: A 500-kg car is movil7fyri8/vg/jrn: ;c,kw ml)z ng at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to;c)znr , /vkr7jly /i8l:fwgm 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 it stops. Ifmm*ko ad dh/3nvd/f 2+ the ball travels 15 meters, what was the average net force applied while it wa kv2*3mo//ndafmdd +h s coming to a stop?

  02.26: Consider two laboratod2; d sc)dcvzhii v s44f09xf-ry carts of different masses but identical kinetic energies and the three following statements. Which of the above statementdvvf4di )cs xc;-4d0ihz fs29s 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 tossrh-/am5h 74gp w ph;xj0mi5jced vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, whmch jigx0/r5 jpp 4mwh;h5a7- at 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 conc nk67udc5 bseby*2kd4rete surface. The boy, of mass M, leaves the concrete surface with speed v and his center of mass rises a distakybn ec d2u d4k7s65*bnce 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. Tq t;p:cf:itx3he object 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 object whilip c :t;3xfq:te coming to rest?

  12.48: An object of mass M is dropp o3+ /a.yn l6d s ,aym()rn9wc3h(vpir pwj3hned from aheight H above the ground. The object bounces off o)9 yn w(63ndmpl+p3,yr.sh jnvroaawhci( 3 /f 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 Lr,oeqv 5x7b ld(3 qu-z is pulled sideways until the cord makes an angle -xl qe5 v37,uzqd(rob
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 w- deew2yf: 6mincline 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. Th y:e wd2f6mw-ee 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 sidewalt hez0g*xmg11j /nm4 jk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a ma101jzgn4tem *g h/mjxss 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 figure) is applied fornjjdc08 stu/0 the 6.0 meter motion of the box upward along the incline. The mass of the block is M=15 kg. Which one of /t 800dcjnsujthe following choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are eacst -;2, holmnjh 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 twj s t;lho-n,2mo balls changing?

  11.28: A person throws an object of mass M straight upward with aiwfsc-w9* c(wn 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 height does the object of mass 0.5M rise above the launch point? Ignore air refww*-w cic s(9sistance.

  96.20: A force of 10 N stretches a spring that has a spring constant c* zr,s7p k lud:tk69ot 11onoof 20 N/m. The potent1ocukot*6:7zo, dn pstk r91 lial energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energngkkhjr)k+ xce ,h10f;5dpi.y. What is the maximum speed it can impart to a 2.0) 0pkhk+d5 j1 cfeh k.,r;igxn-kg object ?

  

  10.31: An object of mass M starts from rest at qa xhd*a8gq4. the bottom of a fixed incline of height H. A per*ha4qq a .dgx8son 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.