97.01: A force F directed at an angle o8/wtjmbbj+./pxf +7 xn d0vubf θ above the horizontal is used to pull a crate a distance D abv xm +tb/8+djf7un jp/wx.b0cross a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is17 we iybmsx*1 moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constan1xyi7e1msw* b t deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram shetf6 f2 ,.wsr7 t:lg-pp +sxsueet of wallboard 3 meter above the floor for 4 seconds. During these 4 setp -rs2s.se,:6fxf u+tg 7pwlcondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides cs-yzc+-ccbfa; aq8ewr0(t . with uniform acceleration on a horizontal surface for 5.00 s. The b(w+z 0c eab ac;cs-8- .cqfytrlock’s kinetic 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 block slides with uniform accelerationm1wxb gsc 951 :vl1p eq.dq.cl on a horizontal surface for 5.00 s. The blo s:15vq9wmlq 1l .gc.cx 1pdebck’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 righnhp 4 jpt+a (az3i5- 37/o zvyayphpiu7),reat is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surf poyv3 a(4r/i+yi)a n-eh37at pa7,zjuzhpp5ace.
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 exerted4fcm(3w wrw96aphymv+p1 3 kt 7gsam:9bqi(g on a 3.0 kg block for 5.0 s. The block was initially awm3mg:3(rp+pha(v9yws q1wb9 c7f4 mg6tk iat 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 feizd1y*ebo*s 2sb o6qos.b,ad7r 9j4rozen pond throws a 1 kg hammer in one direction. After the th 7yzr2sodqib94 ojbb1o e* ,e a.d*s6srow, the hammer moves 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 givef7ur hldtlt0/pzqmd.q44+*2z fx1 ro s it kinetic energy. An hour after the fan has been tu1 4 rq. oflzdh20dr/lup t4f*tq+xmz7rned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of s /sq2nwd77sl e*7 xn3r3wlrwmass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an acceleration ofs3w37* d erwxqsln7ns2r/ lw7 $1.0\; m/s^{2}$ . 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 froomw + t,4;ilyam the floor. If the janitor relocates the box to the shea4w+miol,y; tlf 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 engihzak;)ctw/jwq, h w eve*80v9ne delivers 24,000 watts (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 the magnitude of the retarding force acw hjzeq) awh,vv 08kec/ 9*w;tting on the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s at the h,ole0 f5y2t s.hrze/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 ofF = 240N. The box, of mass m= 20.0 k hhs.r ftleoz50e2 y,/g, 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 thyd j4ux4p1 1box moves with speed 5.00 m/s at the bottom of a rough, fixed i 1 p414jtdyhuxnclined 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 st73 zn 2kywmpl4arting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has spwk472ny zlp3meed 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 kxe9/im z35zz w2j dp*time interval of the accelew5kx j*9zizpd3m /ze2ration?

  12.08: Through what distance does the object move duringwfsfuwe6j;y1;xvt9j, z ve : * the time interval of the accele xewvf9,;: *fy6tjjeuzv s; w1ration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is chane1( 9/h 0f)pip4kexyytwsu g/ged 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 durw 0p/gh pyf u9(xts4k)1/eeiying this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is inclg3vznof 7+1y reased from 2.00m/s to 4.00m/s.fonz3+g 7lv1y Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is2lb3r)up f( i swsf99d used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor2s9 ) u wrf3(p9idfsbl and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts angx*tqj 4:3s7y( qs ). xmmneqv upward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will t xsjg:mn.x *)tsqy (q47 meqv3his crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is releas g p665v8ygwv:huhtf)ed 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 8guhvp f:h5t6 vg)w6y 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 a 1 (bhkeut ;)lkk-+asx 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 and1b h()uskl xa-kt;+ke its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The :d6+ayzy)q-tzf 1c badriver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of ztzaa:fyyd b)1c+q-6 the minimum average net force necessary to stop?

  00.26: A 500-gram ba po173ksu-d 6efzo(x rll 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 coming6fue(o1 prz7d3s okx- to a stop?

  02.26: Consider two laboratory carts of different masses but;/2a fzjnh5ky identical kinetic enerfa z;jy52h kn/gies and the three following statements. 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 vertically in the air with p2 rn3x7y : qm1yai*ftan initial speed of 4.60 m/s. Ignoring air resistanc pyi3 x1qy t2fanrm*7:e, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upduwe cgd;2x9 ,ward 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 point of the motxwug9, ed2c ;dion. 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. xftr2 n) ,vldma2n,2z The object crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Assu,2l 2n2rm)dzxftn v a,ming 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 d+:4wz lp w1gfmass M is dropped from aheight 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 collision with dfl+p1:z4gw wthe surface?

  96.38: A pendulum bob mass mon a cr sf( 5,ix,elqord length L is pulled sideways until the cord m,,sq ifx5(rl eakes 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 r +bq -g8rgquc-42 kuasled, 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 restbg-2g u +k-4q8acq rru. 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 sdupjjv+8 o3sv0,3drg* xd p*sidewalk, 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 t*,3px vs+0vsr 3odj d ud*8gjphe deliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is appli fs f0ne+f*jgf:33wz 8 3xdoxhed for the 6.0 meter motion of the box upward along the incline. The mass of the block is M=15 kg. Which f+0h* jgsw3o:d8ff3fn e3xxz one of the following choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bntvge4wc9n82 a4ei9bowling balls 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 c n49e8nt2ebai49vgw strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upward wits):l)wn7vimc i (d p.lh an initial non-zero speed v. The object rises to a maximum h7nmp:. ))ld(lwi icsveight 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 resistance.

  96.20: A force of 10 N stretches a spring that has a spring constant of 20k., s)(t3irsk x3rl yb2wz,hl5w4 reko fpi89 N/m. The poto4ki38wr el,iz .w5br k k, p2fxhtl( y9s)s3rential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the iy-4jfw/4i5m q;vsh or2 ga:k maximum speed it ca4o qwia k /2vjihs5;-fr4:gmyn impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed c8+nhcg.iz 9yb /rhvqatx2 p 3,-dys 7incline 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 objectcq-bv8yya+ t ,xnh3dg.h27srp 9zi /c 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.