97.01: A force F directed at axuh18e on41cr n angle of θ above the horizontal is used to pull a crate a distance D ach8u r41nex1ocross a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is moving toward huyhwuu 1;o27rp4b 1fo,7jbch5 ;mhzter 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 balh j2b1 b4pu7 hh,twu15orzy uo;cmf;7 l by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboa +wka. jey4(fsrd 3 meter abov .(skj+ a4efywe the floor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform accele+q3l3 oxvypyznxw ); 5ration on a horizontal surface for 5.00 s. The block’s kinetiv3)x;3zx qn oywpl+y5c 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 uni 0np3qtmxe0c7z*jm* ,dfhq b/form acceleration on a horizontal surfx*3ne*/qm7bdh,z 0fpqt j0m cace for 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 direc/btui l 2*1vxzdsa b71ted to the right is exerted on a 3.0 kg block for 5.0 s. The blocu a/lz17bv s12 dt*xibk 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 rigv/q:akp 5 q0gvht is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizont0p/5vqa v gqk:al surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a fridfbmr1 ra n1.5ctionless 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 direcnd5a m1fb r1r.tion. Which of the following correctly describes the above situation?

  03.14: A fan blows the air andhs 3tetioec, -qn6x+6 gives it kinetic energy. An hour after the fan has been t xq ,io3c et6+-hs6tenurned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0. g30)+jaa a lh:mvp4qt50 kg has a position of 3.0 m, a speed of 4.0 m/s, an: h plg0ja4mvaa3+t )qd 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 bookroon7 sf,h83 mcdhm 1.3 m from the floor. If the janitor reloh 3f nm8c7dh,scates 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 hor4m yktgzl52t (fs hko4uj4y-j ,s2 :xgsepower) of power to a car's driving wheels. If the car maintains a constant speeyfg- 2( t,lhs y4t z25skjkxoj4g:um4 d of 30 m/s (about 65 mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box moves wivi ,/yhjc)x5n4gixsx89h b:xth speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant accelerati,ji 5n4x:g 9yx/b)xchx8sih v on 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 m1v(fe z 4 u9*7b/ yfn+8p4nulrjaveeuoves 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 of F = 240N. The box, of mass m= 20.0 kg, has4u 7 z8b(pe*r 9yv1/al +fen4uunvj fe 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,b:4 wa06o dwxh each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After travew0d4bh xowa6: ling a distance 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 object during the time itq *u3mizjv:p :lh. i)nterval of the accelerv* :iuqj.pzth 3):mli ation?

  12.08: Through what distanipfgcki 1m(/+ 4npsensv6 iy1d;09 occe does the object move during the time interval of the acceleration i/9ykef(dns6n 1c; po1gp c4vim+ is0

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is chang +7vdw1eyk;r gm54ed ned 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 5+1gw4kendy d7erv m ;energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kxvws/+veq3 bc4/ b4tjinetic energy while its speed is increased from 2.00m/s to 4.00m/s.t3 /q 4evwjs 4b/bxcv+ 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 is ufa5a8f -n:u tised 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 the frictional force ist ua in8f5a-:f:

  14.31: A toy crane exerts an upward force and delivers a useful e(xpt+4gq 7 1a3sju1wv inn v1power output of 0 uq11ps vgi 3 xv47aj+1en(wnt.10 w to raise a block vertically at a 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 Earth, the u x ;uw71nqs5wmc+ s19nxduw8fmhl,0 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 fd 1m nhxusxq5s0lwwu1 w7 n,m;c9u +8work done by the gravitational force acting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is helvl9k9uipzs/ (q z; bb6d 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 rela;6q/ ubz pi9 9bzk(vlstionship 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/srhtqmh5wj9ld j ...(ot,sf /o . The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is9w sqjh../omjhf.5 o d,tr(l t 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 i 2as s:6t2ucubjhwpe 3i27 *avt stops. If the ball travels 15 meters, what was the average net force applied while it wav:tu6*bp2 22h3s7ajas iucw es coming to a stop?

  02.26: Consider two laboratory carts of different masses but ky a4s, (o zid*0hnq8ridentical kinetic energies and the three following statemk4* 8nrs a h0zioq,(dyents. 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 clay8bms d ge1x;z( is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what(1b8e xs;gd zm is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight uy8+rt b0 + r/aksesj:tpward 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 atkjr0:te +y+s 8sar b/nd the concrete do on the boy?

  02.48: An object of mass j5;o/oe3g kgz ,zs8tf M is dropped from aheightH above the ground. The object crashes into some soft eart,ze 5s3o/o;g gzf8j tkh 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 ground on the object while coming to rest?

  12.48: An object of mass M is dropped fromd6v,nn317ifm o8o vo s 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 averagvio f,o7s1n6d nv3mo8 e net force acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon 1w40zknk ek//m(l bpce:jn 5wa cord length L is pulled sideways until the cord makes 4k:npjl/(nkc/0 wz1e5bmkw ean 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 incl/7 .xzrxau gg0ine 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 hilux7.0g /zgar xl. What is the sled's speed when it returns to its original position at the bottom of the hill?

  06.09: A deliveryman moves 1zkc/.u,h*. rqma5 z1 sj scpx-0 cartons from the 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 the deliveryman on the cartons to mo/az5z*cc jmph s.,qx 1k-.u rsve them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) k4oc* 7vl f,bgtu);s lis applied for the 6.0 meter motion of the box upward along the incline. The mass of the block is M, ko v 7ugs)b*lctf4l;=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 ballwd ;q1,p(,m4slrmp ud s 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 ground, how are the mechanical energies of the two balls chandmp q1ld rw4,p,su;m (ging?

  11.28: A person throws an object of mass M straight upward with an initial cd)i ),wjbm8nnon-zero spn i8j)dcb,m)w eed 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 resistance.

  96.20: A force of 10 N stretches a spring that has a spring cfq , h90ufgt)ma.1 riw8c xyp9onstant of 20 N/m. The potential energy stored in the.auf9 cgwyrpt f1mq)x9i, h08 spring is:

  97.10: A compressed spring has 16 J of potential energy. What is t s*l7)zonby)g he maximum speed it can impart to a 2.0-zs og7* nlby))kg object ?

  

  10.31: An object of mass M staw xqs1a*:-gj w; jcvid+fsx: 1rts 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 diagram. In each of the trials, the object reaches the top of the incline with speed V. How would the work done by the p+cxw1xs j*:faq1vs : jwdi; -gerson 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.