97.01: A force F directed at an angle of θ above the 4lcvv zb 0,a9 r4y/xpehorizontal is used to pull ,/ 9rzb p4 av4y0lcexva crate a distance D across a level floor. The work done by the force F is

  97.33: A softball player catches a b a) ey3wo/.fm)kg.nmi all 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 force exerted on the ball by her m yf ia)onw/m ..3k)gehand is

  99.14: A construction laborer ho,th.qpu hs6 *clds a 20 kilogram sheet of wallboard 3 meter above the floor fop ct6sh., uhq*r 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleratio5g- r5r8dv) pbt0mijiu8rr5on on a horizontal surface for 5.00 s.rpvm85 r5rb 05)8d-juoiti gr The block’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 acceleration on a horizontal su1kgb ezbh2j:8s+p p) crface for 5.00 s. The )bbpgc z1 2j+8eh :kspblock’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 a w3d-n xm / ju0v9;axst3.0 kg block for 5. mv9sx/;3-j w0atunxd0 s. 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 dird(4vcb/ *jugv ected to the right is exerted on a 3.0 kg block for 5.0 s. The bloc/* (uvcv bjgd4k 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 initialybm *d8 vaxu26ly at reston a frictionless frozen pond throws a 1 kg hammer in one directiovb 6dxu8*a2 myn. After the throw, 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 dd5+sra f/m*c(ybfb- and gives it kinetic energy. An hour after the fan has been tur(sd5*/r +fycd- f mbabned 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 speetkqz3y0 9 *jh+sde6c4 gpv*npd of 4.0 m/s, and an acceleration9zj+n* qph *eg0tcky4vd6 3 sp 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 fr. y+d 8 mvuy( 0wr*rgb+s6uqebom the floor. If the janitor relocatesym v( 0bry8derw*u+b+ugs6. q 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 32 horse p w7x/fx*ea2cpower) 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 pf xa27 xe*cw/of the retarding force acting on the car?

  09.13: In the figureo:aga(t5 6w j1uioyf7(,mn ai to the right, 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 ofF = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the top of tfna, o6mt gyiu17jo((w aai5: he 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 the bottos,e q9-,.a slh bczp1 vf)-ulom 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 bhlu-al)fopc v 9b,s,-qze.1 sox, 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, along a str6laog /6kvv(r00b yfj aight 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 same distance F, what is its speed in terms offj 60 vk/ o06rvbyga(l B?

  12.07: What is the net force acting on the object during the time interval, xr*cn 0ur)zr59lx hm of the acceleratr m,xr)uh*x c0z5rnl 9ion?

  12.08: Through what distance does the object move during the time interv+ml5w2mdk6d y xx+q4pd* pvt)al of the acceleratp dkm dmt5d4)py6+2w lx*+ xvqion

  12.19: The magnitude of the linear)t n0vhx(1si* rxpit7 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 change in the kinetic ener*xv sphir1tn7 0 )(itxgy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is in (tx mymib- u7ymz/o,e/r;2rzcreased from 2.00m/s to i7yt(2 y z -r;/me,ozbm u/mxr4.00m/s. Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizo 8p ovf(k(/nmy8qi6wxntal 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 w8w i/pf(8(x kmnyo6vqork done by the frictional force is:

  14.31: A toy crane exerts an upward force and delivers a 8a kt(wfgdq :f1yc l95useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant sp(c wgf81qd 5f9ylkat:eed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of th4dl v hko l,b;mkc)-:1p ; f0hkyxtghe.y*9rce 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 amountrx4oy k.h1gf,kllhk;t90bc) :mc- ye* h;dvp 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 an+;eg*ezkzp x sun1.6 height ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the foll6pzs ee*.;xuk 1+nngzowing 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 isf 9h*9g vnco(g4x;ijs moving at 28 m/s. The driver sees a barrier ahead. If the car takes 95 x gj94os*f; vhnig9(c meters to come to rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball movi+(tt2(tn7rer iu t3ghng 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 i+u 3 rt72ttt(hngre(a stop?

  02.26: Consider two laboratory carts of different masses but ideg*al8*drsib5 u n(p) yntical kinetic energies and the three following statements. Which of the above stat a)(br 8u s*yildnpg*5ements 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 initial or8+0t k:jj3:o haqvn)y 6be lspeed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reache rl:6 vj)bko :t8y+o0jh3qa nes its highest point?

  06.20: A boy jumps from rest straight upward:d-mob 3y a1uk/r b)zf5uo6el( )nvlj from a flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface with speed v and his center of mass3:6d )zn kmore-uy1aob) fu5j l(vlb / 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 dr, *jfmvs.auq:k (fn9copped 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 averagek:m ,*j.c(sfavnuf q9 constant force 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 ground. The objem:eyuf2 5.z em*b zvd(y8pjd6 ct 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 y2ju65 z8(zbepf m:*yv.eddm 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 pulled sideways until the c(2 tazh20rq10 funy*k 8a+ pdlumsig,ord makes an an2 80(tdfk uglur+n ,z h*q21a yaspi0mgle
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 uniform8/7 flxud. i70 nqf ou:c.vdaw 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 position and momentarily comes to rest. The sled then slides back down the hill. What is the sled's speed when it returns to 0. uxunw 87o.fd:dcql/fiav 7 its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, alc/d8huis/yeb;qs +c9 ** 1cpkh 5ozxjong 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 the deliveryman on the cartons to c/8 cjy5kdz1*i9phb/ *euh co+ s ;xqsmove them to the loading dock?

  12.16: A constant force F=50N st topw/ffhp)i7:tjk 0 o88f +(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 one of the following choice8 p8)0t/ jktwff +7ops ohitf:s 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 reve,l 5xorwo 96 roe/,gst from the top of a tall tower. Ball A is dropped one second before ball B. After ball B is dropped but before bale oel9xr,ov w6g/5,or l A 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 with an initial non-zyx;iq 8,nltjy(n6;vh gs :m(aero 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 theyh,(n;gya8(x nm: j6;q sitl v launch point? Ignore air resistance.

  96.20: A force of 10 Ngc:4 so )+rye( z4ttzk d(a rmp4*0ofs stretches a spring that has a spring constant of 20 N/m. The potentiag*zc:ods(t tyfpa)om+ e (kr440rz4 s l energy stored in the spring is:

  97.10: A compressed spr gbe88( tgmakrjo)b8i9c6hw0 ing has 16 J of potential energy. What is the maximum speed it can impart t ggab )8(ei6mj9 ktwb80 hc8oro a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest+wmegza-d /. ) 5hjpls at the bottom 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 work done by the person on the block compare for the two trialsa-+pwsh ).gmjedz5 l /? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.