97.01: A force F dire5 ku;g i/xnbeg0w(6p fcted at an angle of θ above the horizontal is used to pull a crate a distance D across a level floor. The work done by u0x gi gnk e6(5;fpw/bthe force F is

  97.33: A softball player catches a ball of mass m, which is movufr : /iymen(3ing toward her with horizontal speed vn/iu(ym f3r:e . While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wal:rotyjji)bj8 :bw jo pb.4u/ -lboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power war:jyt-job4b8wpjo b.): iu/j s expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleratio lqmza*rm0 o:wwju 12.n on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50j*2w:qoml uz1m .0arw .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 a-f jlo itx:v33np- m80ze)loecceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases froml j -tn 8xepo:3)3zifv-m0leo 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 lmdgx8a9q+ 1+3z1kb0pack v: r xmo1d on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a b+ m 3xr1pk8m9a+v zq101ogxdkc a:dlhorizontal 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.-x)klqy ck84tkx mj1* 0 kg block for 5.0 s. The block was initially at rest and slidec *kltk-1xjy 8)kxmq4 s 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 ;kuzf j/3bs0kthrows a 1 kg hammer /k;s0zk3f jubin one direction. 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 and gives it kinetic energy. An hf s*y l) xli(q2ojp-9sour after the fan has been turned off( i s-2)fjx9p slyq*lo,
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 3.0xwaxr u h(i +t4g05mg0 m, a speed of 4.0 m/s, and an acceler xur4tg5 +h(xga0iw0mation 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 sh;kw4sid:bwv;x+d3da elf in the bookroom 1.3 m from the floor. If the janitor reloc wsdd3bw ;vx ;dika:4+ates 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 delivetjcxc qsw ,0(c96hif 4rs 24,000 watts (about 32 horsepower) of power to a car's driving wheels. I0(qh6,ifjscc w4tc 9xf 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 figure31uqtmyn 1 ,qs 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 2.5mqnt11,sy 3uq0 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 w ), vqt7ol1x yo4ak(jkith speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with conx q1yt k4ako jlv7,o()stant 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 traveljxm aege/-9 c. to the right, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car B has traveled th 9ejgxcm-. a/ee same distance F, what is its speed in terms of B?

  12.07: What is the net force acting on the objecf6njgo lb 89u.c 0zf)yt during the time interval of tc86zyff0). 9ulg onjb he acceleration?

  12.08: Through what distance does the object move during the time interv)yg4hgymxty 7-a ;u gis;;i)t f5+tn ial of the accelerati-mgiyf; n t+u)aigyt; ts4;h )gx57yion

  12.19: The magnitude of the linear momentum of a 4.00 kg point maso;v: sav gt-n85 qtyz+s 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 tiv5n q 8va;o:tg+yt z-sme interval?

  14.11: A crate gains10f egbv3 vz4 5vju-sfirz21q 36.0 J of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one ofv 1z2 egvfq5vi43jzr 0f1s -bu the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the hlxj dnr3fr8+ ,s p;n*eorizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coeffici8nfrd x*s,3;nlp +jerent of friction between the floor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward+ ho. us eg9*lbt7:eye 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 this crane raise a9os +7egtuh *.lee :by 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of the Earckg o:5wd95nlth, 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 gravitational force acting on the Earth by the 1.00 kg object gl5k:c d9 n5owduring the fall?

  96.18: A rubber ball is vdk8r. wb:8 ata* zia7 m+8kesheld motionless a height 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 relatitai8 8sbkw+vde *ma 8.:ak rz7onship 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 m/s. The driver sees a barrier ahead. Ifk ty61gn1 g5qudj5.l;l hrm f; the car takes 95 meters to come to rest, what is the magnitude of the minimr1;muj;d1. 6f5tkl lhg5g qyn um average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows dowh/t.o tl2 ebb9dd.f4nn uniformly until it stops. If the ball travels 15 meters, b. 492ttdnd/o.hl feb what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory cartwej so1vni,n0 ,h4) aus of different masses but identical kinetic energies and the three fol,w 40nnseia)o jv,hu 1lowing 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 wenw uv8 dm; bf:ipf+00ith an initial spee: b0fv 0i;emupw8dfn +d of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from2aw-9t1c p e+rc kyfq) rest straight upward 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 motion. How much physical work did the average normal force of contact (N) between the boy’ s feet and the concrete do on thfkpr9 )ec1yc- w q+2ate boy?

  02.48: An object of mtko2bh y73 xl+: pzbc4ass M is dropped from aheightH above the ground. The object crashes into some soft earth and comes4+pb7c yh o2xlzt3:bk 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 exerted by the ground on the object while coming to rest?

  12.48: An object of mass M is dropped from aheight Hq -hcip; /( 4xl5+brnmoeyeo / above the ground. The object boun;eo(qi4y 5xm+l/hecbr o/- pnces 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 the surface?

  96.38: A pendulum bob mass mon a cord lengthu-v w*j6u; rln L is pulled sideways until the cord makes an anglwl;u- rv6 *njue
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, which ;peg4 bsfnz:g) 48r ao 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 pongaz8b:;f4)s rge4 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-meteq 6k/ov+assn h/mi 78dr 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 deliveh/vd+76kos8/ nmasi q ryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as show u0ztdh i/sz0)n 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 choices best represeu0ti)/d zz0hsnts the work done by the force F onthe box for the motion?

  04.48: Two identical bowlingnc( wztu th;28 kz cwp.wf13q8 balls A and B are each dropped from rest from the top of a tall tower. Ball A is dropped one3w 8nw1hfz;tt.c 2k8p z( qcwu second before ball B. After ball B is dropped but before ball 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 zkm g 44ds(0k0gqk-kaqiuk 8 8hu+vg0an 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? Ignore8idg0ks+h0u 4gkzuv8qamg -(k k0 k4q air resistance.

  96.20: A force of 10 N stretches a spring that has a spring con-3*n(dw,ygy wo2u ijfqlo4 a1stant of 20 N/m. The potential energy store-* uwyqly jg3 fa1w2(oi ,d4nod in the spring is:

  97.10: A compressed spring has 16 J of potentia*2a aos2z6kl kl energy. What is the maximum speed it can impart to a 2z2l kso6ak*2a .0-kg object ?

  

  10.31: An object of mass 8wzaif5h:4kh,i hhi qgo6v6, p da9.bM starts from rest 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 diagra8izho,bv9h6ap6d i hah f.g45,: iqwkm. 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.