97.01: A force F directed at an angle of θ above th drwvn5kz+4 i9e horizontal is used to pull a crate a dvin9w z4kr+d5istance 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 moving to cgcz8 b9in*:oru ;8sfward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant decelerati* cnribg8fs:u z8; 9ocon, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilograyx-tmt -z1( .z7jowga 043)fvsifujom sheet of wallboard 3 meter above the flooro-4yv jm.f x-i0sugjt)z3z7a w t (f1o for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform accelerwj;izz+*: e2 *p:usqwpe) hg6psn v m7ation on a horizontal surface for 5.00 s. The block’s kinetic energy sh6e wiwzg)s7mvzqp+2p: eu s:;j n*p* trictly 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 blocud b5yde4(i 1 caq ;n83b2fvcqk slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases f qd(5ub e 2ny8c abq4ifc31vd;rom 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 y -:0c f,t ntdihhfi+037c9sc xneoy8 is exerted on a 3.0 kg block for 5.0 s.iy3 e8h+tf: nc, ischyn9d7x c -ot00f The block was initially at rest 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 rg d9++ 8 wut2wd8td+x+lzgadi:8ozp., xp xc pight is exerted on a 3.0 kg block for 5.0 s. Th8dxx 8pz d+xp,+o9.td gw8t:w uc ilg+p2+ad ze 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 res bm g+kpf,9a;fqo/i(hton 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 o qfho; f mkpai9b/+g(,f the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy.sn9x w tlo we(yie r..nc,.5.td8 mj;x An hour after the fan has been tc od wtm(nt589 iyx;.en wr.e.l.,jx surned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 rflk1nirsp:jy 7 f3)+kg has a position of 3.0 m, a speed of 4.0 :+sfnrl7frj1)k3pyim/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 oesj1e3; bknr*zo- g qy)1 lu4nn 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 does he do on the box. The box has a kq; eubg3yer)1n-s1*z nlj4omass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepu( r7 i6evh*owower) of power to a car's driv*i6wvoeh( ru7 ing wheels. If the car maintains a constant speed 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 5.00 m/s at the bot y**t; eghx;zoy nfx 2 )xj:,/myttv1xtom 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 coneof/ )vxxhy,* tym:;jgtn2x*yzt1 ;xstant 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 movuq,g f. etfwzrk vg0s c9(,.,fes with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with w.srce, ( .kfgft,ugz0f,q v9constant 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 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, a - gyiz4(a:;gixsndo0long a straight road. CarA has twice the acced-(y 0g4iaon gzsi;:xleration 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 the timexpgkl722p8x z interval of the accele2pl8k2pzx7 xg ration?

  12.08: Through what distance does the object move during the v vky2 hsb8t+egg* a))ykz6/ntime interval of the acceler ty+vs8/*)g)v 2k bnk6hyzega ation

  12.19: The magnitude of the linear momentum of a 4.00 kg zgo :- g/q8wcxpoint mass is changed from 6.00kg.m/s to 14.0kg.m/s in8oqx :- g/wgcz a time interval of 6.00 s. What is the change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic eepuqc 7uq4sj aeaiw. 5ow8(dtn* im8zpr 6 151nergy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following c54q 5uz8.1*pqi1t(u jo 7w eapdircmnaes 86w hoices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pubjz.w;w xp65w ll 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 done by the fric6zw5. xp ;wbjwtional force is:

  14.31: A toy crane exerts an upward force and delivers a useful power output osg 1 k21f cvssf(53ekkf 0.10 w to raise a block vertically at a constant speed. At what constg2( 1kf s1kcs svk3f5eant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is re k6/f+dog a ycx.t3i4eleased from rest near the surface of the Earth, the gravitational force acting on the 1.00 kg object by the Earth does 10.0 J g4ye ca+fd 6ox i.k/t3of 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 aboi4mqim) zxjey mz7.pv+ q801rve a hard floor and released. Assuming that the collision with the floor is elastic, which r)j 0zey41 q.ixi8 mmpq7+vmzone 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 d1ennm i++9h kznt 1*tm/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what *entt k+din191 +h znmis the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball-dr0wnxft5u x7) stu z4y l5:c moving at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was coming to a 0xxnz )-ru5 wt7l4df5c:sy u tstop?

  02.26: Consider two laboratory carts ;qww2cy2ak t u.trk(; of different masses but identical kinetic energies and the three following statements. Which of the above statem c qywt(. twk2a;;ukr2ents 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 initiajjdxxkdo)3s v:.el21kx /hhrz4 7 qi-l speed of 4.60 m/s. Ignorin ed/1dj3 4lj7 2okxhk: iv shqz)x-.xrg air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight usef tg5s+w+ g,pward 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 distance d to the highest poinws, g+ ftgse5+t 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 Mmlh9ckv)c5 e, is dropped from aheightH above the ground. The 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 f,v9emclh 5)kcorce 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 1o1 -,oqueue wrjxfi2xda3(9 ground. The object bounces off of a horizontal surface in a collision lastingur3 qu9 x-1oae x(fjdoe2i1 ,w 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 pulz4m jvmh0axlmt)q3)nb vr /- .led sideways until the cord makes an a/vr3) 0 .vmhz lmxntj4q)-m abngle
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. qmb tr779t0oae wx+x i450rok94z qjc 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 tqr 40o qi bexx47r5cz j+ atw97k0m9oposition 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, along a 10-meteaxt(y963hc 7e nnyi7 rr 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 the cartons to move them to the loadin6r ya 7(c7neix yth39ng dock?

  12.16: A constant forceopk: 4rta*u +;4uu +vv xec7ul 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 block is M=15 kg. Which o;c7xt +u4v:4uo lkurp*uve+ ane of the 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 each dropped from rest djozgy 0jkx;3- 1khckml;3w8from the top of a tall tower. Ball A is dropped one second before ball B. After ball B is dropp mz8wk0yk3;dgcxhj3 k- 1j;lo ed but before ball A strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an objectr ywgp72xs f7+g6i-agw 6ppf 7 of mass M straight upward with an initial non-zero speed v. The object rises to a maximum height H above the lau apsgywxfp77 76gw 62pr igf-+nch 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 stretc)u4hl7 q wsnc5ewg ,zo0e.7e ohes a spring that has a spring constant of 20 N/m. The potential energy stored in the spring ishzoc.q7o e 07e)g,wlw4nu5e s:

  97.10: A compressed spring has 16 J of potential energy. What is the maximt;d .xa)zz hp6g;+q bu 0lf,gtum speed it can impart txaz,0 ldgttg +p;zb quh.;6 )fo a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incline m1n3 mpwm,/tsn r4m+ujblu35of height H. A person decides tt,/lr 341mnn+3smupw mj5 bmuo 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.