97.01: A force F directed at an angle of θ rxzr8xhd 5 2s,above the horizontal is used to pull a crate a distance D across a level floor. The work s rzd2,8x rhx5done by the force F is

  97.33: A softball player catches a ball of mass m, wh4(sw42 .4elkhsonxl t ich 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 the ba so.kxlhl4en4 ws4(2tll by her hand is

  99.14: A construction laborer holds a 20 kilogramkg9570 nl ufg0c+ mzfk sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the wallboard9klgn+ 0z5ugcf7 f0km?

  17.11: A 5.00 kg block slides with uniform acceleration oi y.6rf(ytbrvfz5g2( n a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 5052v(ib 6zfgr. (ytfr y.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 block slides with uniforh1,lmmu*v0s+4: azy(/dmtw. fo )gja in8r n lm acceleration on a horizontal surface for 5.0mhz14(,y lmv un/o.i*:0r d+g)sajwta8 lfnm0 s. 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 a4 re 6c15wpyp42lh k7xxd 2ibz 3.0 kg block for 5.0 s. The block was initially at rest and slide4pw65p 2h b7yxcld24kizr e1xs 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 3.0 kg block for. 8,y zk8acy(0qt dn9umgspal+oue fnk :*x9 0 5.0 s. The block was initially at rest and slides on a horiz,a f 80:nkn t90.+k9sm8euyxcl p *daog(u yzqontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston atsz 0a11 :xxhb 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 s1:bh1atzx0 xdirection. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour after thsltk5w xdp)6 7fu2 )dhe fan has been xp2t)d f7w5)sh6l dkuturned 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 spee9dmf u0o-q n 0be-)fapd of 4.0 m/e)ufb0qn m-9apfo -d 0s, 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 tlg)z4hq / )c vo/lauw)extbooks is on the middle shelf in the bookroom 1.3 m from the flu4 /hl wgoqav))c/ lz)oor. 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 watts (about 32i) k07vm-iri. s ;hb 5ldxu2ec horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65hui- cx r5sd.k i em)2vi70;bl mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to 2 8qe fkl,/sqko 9i6k ql(aba*the right, a box moves with speed 5.00 m/s at the bottom of a rough, fixed inclikb6fqk lq2k8ie*a , 9oas /ql(ned 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.t p20* fwj/kpk v*juw700 m/s at the bottom of a roughkw7 *pkj/2u0*w pf tjv, 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 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 f7 tmq**lpjv.y 6n/n ktrom rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a dvn .qmny*tl p/7kt*j6istance 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 objhb,bj*m 3q+2ynruje-ts o 8o h,j7,saect during the time interval of the acceleratsnuoh*,t3 j,a2ys,q bo+b erj87 mh- jion?

  12.08: Through what distance does theey (zz 9v.l/m7 lxc,;aacs) ah object move during the time interval of the acceleration xh cv/.asl) e(m,y zaazc;9l7

  12.19: The magnitude of the line/2qw0p6 p. rn*u mkpkear momentum 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 chane /qwp2kp0m.p* rk6nuge in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy aiky60vpij(- ,ft6 rdo nsv96while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of the cra60fd6 - nips9 takjoy,vir6v(te

  94.38: A force F at an angle θ above the horizontal isw+ynlv 1m 6+0g d)tcyc 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 done by g+0 tyycd+nwm)1cv6lthe frictional force is:

  14.31: A toy crane exerts an upward force and delivers a useful power output ofsuu6s+fd3 z/pxtni 2hdbh69/ 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raise ah+ss un 6z236pdi/d9hx tb fu/ 0.20 kg block?

  12.18: A 1.00 kg object is rezbt - 9lx(:dyjoihz)7 leased from rest near the surface of the Earth, the gravitational force acting on the 1.00 kg object by the Eart)jb-zl yzt h7d(o 9ix:h 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 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 above .sazb01 u pmk3m5n(pya hard floor and released. Assuming that the collip b3 .nmz(a5kyms 0pu1sion 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 above the surface?

  07.06: A 500-kg car is moving at 2p6 s8fo;z4jkg52w l qnh6n- np8 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is6po kwqnzls5-8h4f n n;j2g6p 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. If5k,3q6no alp ssy4puuc4*5xa the ball travels 15 meters, what was the average net force applied while it waa*n pu3lqkpa5,54suy 4x6o scs coming to a stop?

  02.26: Consider two laboratory carts of di,csc3ik.0..m3 . ccfllvwj zv fferent masses but identical kinetic energies and the three following statements. 0kc cfjl3c3clv iz.ws. v.,m. 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 n*7xc)fm l9)fn xtkj:vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in it)mc9l:xn7*)fx f kjt ns potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary concrete su /y2*dtyxx4e crface. The boy,/*xy4t yxedc2 of mass M, leaves the 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 droppeda1ppf+r- 8as9lmm1q bf2dp.6 9dclyrx8n2 pz 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 force exertedd2 m9r+f1n-zl9p c b m qy1dpl882xfp as.apr6 by the ground on the object while coming to rest?

  12.48: An object of mass M is dropped from arwih14t):85uf zfvjrqg* k k s7f7er:height H 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 coll7fhz s5r*i18evkfr4:7 : w ktj)rf guqision with the surface?

  96.38: A pendulum bob mass mfj3r m040fox1g)mwj rw 9y34a 44qosmo f 4refon a cord length L is pulled sideways until the cordj0mfr4em g)j1404 srfw 4 oo y3 x3armfoqw94f 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 a uniform incline of unknown angle. The sled, whiov -o: fs/h j4pvu8z8ich 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 s p/uz:so vh-f8jov84 ipeed when it returns to its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 carton;6 fk o7lzvv;zs from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. Ilkf;o 7vv;z z6f 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 loading dock?

  12.16: A constant force F=50N (as shown in the figure) is applied for vsy1 4kx/lpm( the 6.0 meter mot1 spvmk4/ ylx(ion of the box upward along the incline. The mass of the block is M=15 kg. Which one of the following choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling b z70*k1zsypp.aba o fd;ct6y58* honp alls A and B are each 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 groun pz6zkya80d*s 7b to; ay*fpopn.c51h d, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upward0-k- ylooqdn nws7d /7 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 0.5M rise above the launch point? Ignore air resiqnd oslyw7 k7n/d -o0-stance.

  96.20: A force of 10 N stre8qwc(cbz 0-7 fz (fvwth vxk29tches a spring that has a spring constant of 20 N/m. The potential energy stored in the sprb (wtqk-vc9(f7vfhzx2zc8w 0 ing is:

  97.10: A compressed spring has 16 J of potential energy. What ikwjooiv u.77bor3a+ 7iz fr)8s the maximum speed it can imauw7+ ri8 i)fv7obkr.z 3ooj 7part to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incli t47 gj+qxq hjhzcts18:fzl51ne 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 work done by the person on the block compare for the two trials? Assume the same constant non- zero coefficient of kinetic fric1j flhgqjt:c84zq t xs15z+h7tion between the incline and the object for both trials.