97.01: A force F directed at an angle of5zird-qs)u3 c b0k37cwb3j 0es-e keg θ above the horizontal is used to pull a crate a distance D across a level floor. The work done by the force F i-be 0 35 dc uezgrs3 wqbksjc)073ek-is

  97.33: A softball plab b/cl0miif qw(6k7-25+n mpev4df w zyer catches a ball of 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 force0zmdw4eq7(iv6fk2/ c fb+ wp-n 5blm i exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet ofaaldta va1h :2:3 lv5+rmz, bg wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expe, a vgdva hl:at53balr:2z1m+ nded on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizontal sua4l7la ,or ng0rface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to l n g4olar07a,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 with unijg9g.3rwyyho4i e6jx z-rk41form acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 g9w4gr-y6j ri yeo1xk 34h. zjJ 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 igte)u y:)q h6ts exerted on a 3.0 kg block for 5.0 s. The block was initial6q)y teg:hut) ly 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 forc +ant2ib :a-bif2 m2uje directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was+- b ubai2if:tm2 j2an 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 frictionless frozen pond throws a sg(a6 o1a bc9 o9y.lwq1 kg hammer in one direction. After the throw, the hammer move qb6 .gy91caow9l os(as off in one 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. :2g:np v4eanbrwxd)f *1b8kght:c r) An hour after the fan has been turnev g1 rkbe: p::bc tgrnahd)48x2n)fw*d off,
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, a spws3 fu x3w2ud2s: yz9reed of 4.0 m/s, and an acc3xu3: d2yswu9szr f2 weleration 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 she1fecz (. pa1,k;gsixilf in the bookroom 1.3 m from the floor. If the janitor relocates the box to the shelf that is(e1a ick ipg, f.s;1zx 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 watts (about 32 horsepower) o0 zndtzl86mtae:fxh4b 8 c2(hf power to a car's driving wheels. If the car maintains a constant speed of 30 m/s zf nzt(a:88b0mxc t2el4hh6d (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 li ugb gszk4rt1;+l4 chcu2:7jk 3y8b 5.00 m/s at the bottom of a rough, fixedbclyg;ik1rukz7:ht 43 cluj4 +gsb28 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 rmjyz/umbu9b3;oi/zfq-a a( 7 ight, a box moves with speed 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= 20.0 kg, has a speed of 2.50 m/swhen it reachi ;mzz3m abub9(aoy/7 jf- /ques the top of the incline.
How much work is done by the applied force F to the box?

  11.30: Two cars travel to thqlsq3o:g,b,yvk ez2gtd) zfzdc ,67 6 e right, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance Flg,ks b6ez2y 7 z:3z)of tvqd g6,cd,q, 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 acttjd(yd- ei kj zbhym)c9/1j20 ing on the object during the time interval of the ac yt c2jjbzkd(j)/iy9e0h -md1celeration?

  12.08: Through what distance does the object move during the time insq2 ovi 7 )/v8 avkn6wwyxdl+1terval of the accelerationli6y sdan2v w/koxqv )1 87+wv

  12.19: The magnitude of the linear mamqeda +6v9(gomentum 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 the kinetic energy of the mass during this time inter e(v+ag6mdq a9val?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is increased from 5-yi4 xxbnakwxv*5s 1;qq,m o 2.00m/s to 4.00m/s. Which one of the follxi 5 qxxm* qk sb1wvya,n5o;-4owing choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontvkrmt ,,i15:hb; ) .m cjyusxqal 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;s )yxjq:u,5 mivkt,mb1c h.r done by the frictional force is:

  14.31: A toy crane exerts an upward force and di7;pj ;v6kibo uscuh: o/l4e3elivers a useful power output of 0.10 w tol ev/3:chu6s 4bkoi;u 7ip ;jo raise a block vertically at a constant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object irnj:q/b e;t sei8mo :-n:sg8gs released 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 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 gravitatsjtr / gs8;8:gn-me eqo :bin:ional force acting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a hee a8y 1r3qe:wtight 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 eneyq8et wa:3er 1rgy E of the ball and its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver seestc bwe-tv 498q2k7agc a barrier ahead. If the car takes 95 meters to cot4ck2c79gw- eavtb 8q me to rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball mov )o4pp qr+1be+ qjq.buing 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 sq +r1o+jubpqe.b)qp 4 top?

  02.26: Consider two laboratory carts of different masses but identeq7u9feo2+, beca6; fjzv zt)ical kinetic energies and the three following statements. Which of the above statements wouldtjebzfu,afz 7c )+qe;2vo96 e 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 initial k4k /l+rz5sx8q*ey ndspeed of 4.60 m/s. Ignoring air resersn qy5/xld*4+z8kk istance, 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 concx)-aa;j rppda4z5m r8 rete surface. The boy, of mass M, leaves the concrete surface with speed v 8jd -ma4zpraar x )p5;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 aheightHn4,-o/ih vyz mgq1+iq4uz9)iyh 3dxy above the ground. The object crashes into some soft earth and comes to rest by compressin1 oimdq, +hqiuy/n) y3z4x h 4zgiyv-9g 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 d63+ief f8 lcnH above 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 on the mass during the collision with ic+fl8n36e dfthe surface?

  96.38: A pendulum bob mass msh(s;h,r/ + *sqsqsm oon a cord length L is pulled sideways until the cord sq*mqrh(/s;so +s s h,makes 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 ac2m)stsyc -8s: 6okgy uniform 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 po82 s:otscg m)cy-k6sysition 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 sidefvru3kyoln n h++( ):lwalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each car+y)3r(nollvk u :n f+hton has a mass 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 e 0wca n/)2ijbpxej 30wc e85bapplied 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 the0ja b i)8cejxb5e 2n3c/ew pw0 work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from restepc *cy3n a5lxyb r)qc1z7j*f*ve 9-u 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 strikey*ezlx9c1 ja-q*p 5n73rb)*cyv uecf s the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throkn) ;rs/v 3.v vlu7wzpws an object of 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 of mass 0.5M straight upward with initial speed 2v. In terms of H, to what maximum height does the object of mass 0.5ur vkwv7n/vl3s )p.z; M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring constant of 20 N/m. z/p )a( psjkn4 gq1 j:qrc,3egkt(8htTs q/ jkc1 rp,pqet k8tan(4gh3j :g)z(he potential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energve6 i( zw7h.kx 5yf:yry. What is the maximum speed it can iz:(fwy76ex rkyv h.5 impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the botto jd1ib.,sbkahn c7 .6fm 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 with speed V. How would the wb7 jfa6.kbi hs ,d.1ncork 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.