97.01: A force F directed at an angle of θ above the horizontal is used tot.72k-ma9 qj5i-duif 3tg taz pull a crate a distance D across a level floor. .ui --5dtt9k z jaqg afmt23i7The work done by the force F is

  97.33: A softball player catches u +)ng/oskao6 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 force exerted on the ball by k+oas6 uog) n/her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 3 mete gq)cgeg1:x d728s wvrr above the floor for 4 seconds. During these 4 secondshow muchrq71):g2 gd 8v excgsw power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizontal bio8 , xn9l25kej1/ymm6rmqy surface for 5.00 s. The block’s kinetic energy striylo5jyrq/,16 mk bn9 em8xm2ictly 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 acceleratu9fbwl u4-e91q v +gocx sd1h7ion on a horizontal surface foxq 49ugofw17 9dl cu 1-hb+sver 5.00 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 9a- j0q+ lefx+1dcyqiexerted on a 3.0 kg block for qdlceja+0 q9- 1x+yi f5.0 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 directed to the righm:.; kou5k/ kpe9 shitt is exerted on a 3.0 kg block for 5.0 s. The block wptmsu5 k;i :ke.k 9h/oas 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 frc;)ohh8)xhu gozen pond throws a 1 kg hammer in one direhchoh))8ug x; ction. 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 4x5g 82b+skddodzm x* tvk:( mair and gives it kinetic energy. An hour after the fan has been turned +s*d4xg:b k8z5(oxkd d vm m2toff,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has a pos7t .p( a s))hkzez5x7d(auqgiition of 3.0 m, a speed of 4.0 mxdia7z 7qgzak )h)(p t sue.5(/s, 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 textbooks is on the middle shelf in the bookroom 1.3 m fro1a(2acgxp, xgq+o2k w63 qy(noix - nam the floor. If the janitor relocaoa2 ,o gc6a+-xqnwgaxiy(q( 1n 2kx3p tes 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 24,000y0 (g5,i lgpnhkge wox r+/:9c 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 rwg,lk9(gy ir5ce op h0/xn: +getarding force acting on the car?

  09.13: In the figure to the right, a b7v0nhvf kxe/ 1ox 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 spee0v k17 ev/fnxhd 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 wic.4u ww /bkyxhnw0lwa q ;.a70th 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 = x 4anlw/c0q0k uhwb.wa.7yw; 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 jte1 hi3ff0nyns0ob9sej, 08r1dwt7to the right, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance h 9, bdio8ytw0et n0fj11enf3s rsj07F, 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 object during the time interva8l+*0i rcqmo itvf: oj13(htvl of the acfctmooiiv8 h t:+l13*qrj 0( vceleration?

  12.08: Through what distanceg,86box f23 gnt gkg.x does the object move during the time interval of the accele gg2fxgt8xb gk,o .n36ration

  12.19: The magnitude of the linear momentum of a 4.00 kg ps ihg 8 z/zkv 6e.ys9hlz:h(;zoint mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. Whatl i6 hzh yz/:zk9szhe;gs8.v( is the change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0l niv05g;/ aea J of kinetic energy while its speed is increased from 2.00m/sav/gln; 5e ia0 to 4.00m/s. Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle 8um-:po v rbd:θ above the horizontal 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 8vrb- om u:p:dis μ. The work done by the frictional force is:

  14.31: A toy crane exerts an l9p:v+(k;jepzltt 6n dl*m-w upward force and delivers a useful power output of 0.10 w to raise a block vertically at a w l*m tknvpt;(le9-:ld6 +zjp constant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of the Eartc4lgx zmm3 8r,r*h bz.kz 7t(ph, the gravitational force acting on the 1.00 kg object by the Earth does 10.0 J of work on 34p8zgt rc7bz*,mrhm. zl(kx 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 uxgrw):a.kgw k(gn x -)s)f*ha height ho above a hard floor and released. Assuming that the collision with the floor is xna)k gw-*( x.uwg):sr)hgf k 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 28 m/s. The drivwsxw0m(;z bkfnz3 3( ner sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude ofw0 3xfz(sknmb;nw (z3 the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it stoz xz/hm:dbb0/ps. If the ball travels 15 meters, what was the average net force appliez 0 /mb:bxhz/dd while it was coming to a stop?

  02.26: Consider two laboratory carts of differentmmao0o4a4t so9u4)zy masses but identical kinetic energies and tut)ooza4 os 4 m40yam9he 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,( gy5 :qbjeu2yegg,b vertically in the air with an initial speed ofgb qujge2yy5b,,g ( :e 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 from rest straight upw+p:gb lhz7nhhg 2h4 h1ard 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 gh1l+: hpbh 42 gh7hznconcrete do on the boy?

  02.48: An object of mass M is dropped from aheightH above the grou*pmh5yl1v ,oq xn8 eg7nd. 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 exerted by the e 51yvghq*l8,noxpm7 ground on the object while coming to rest?

  12.48: An object of mass M is dropped from aheight H above the ground.w**pyp,9p6jnd g+t vra(r+ p t 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 the surfacep*rn p t+jrv p9+typa(*w6g ,d?

  96.38: A pendulum bob mass mf s1nn2 wz:(zby9wd5o on a cord length L is pulled sideways until the cord makes n 9 zozwdnyb1s5f2(:wan 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, wtmbc12o qjdd0 ao02m 3hich started at the bottom of the incline moving at 10.0 m/s, rises to a height of 3.30 m above its starting po2321odbdj0tq0o ammcsition 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 si*h20p pbz*o io) u*egmdewalk, 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 the deliveryman on the cartonu*p* z*)mg hei0ob2 ops to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the fi :,mhzx bix,)vgure) 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 be:bz,)xhv im, xst 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 vp/u,sjdpv/9 yt.wuy vc0q.4 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 ground, how are the mechanical energies of the two batdup /.q u9s, w/y0.v vc4yjvplls changing?

  11.28: A person throws an object of mass M straight upwaayh )(9)xphd c 4p8cmprd 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 ma)px 8ppdm9chy cha4 ()ss 0.5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring cons-c- c*qrrh6ps*n,ykt-wcu.h t1 9fvztant of 20 N/m. The potential energy stored in the spr crpcq 9unkt y,--r*.cs-vhwh6 t1 zf*ing is:

  97.10: A compressed spring has 16 J of potential energy. What it6z h)a0(2wfa5 sv.fxj s0manh pt:9ks the maximum speetjv fw.ampkhx05s6a0 n( h ):sf29ztad it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottoeibc +p(2er x 80szy:hm of a fixed incline of heigr+s ze2hy (x0 8bci:peht 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 friction between the incline and the object for both trials.