97.01: A force F directed at an angle of a)3o/sq (iphhnsi//4nzzsw;- qe ok. θ above the horizontal is used to pull a crate a distance D a apn(n/hs/ is/o4k.z-qew;)i zqsoh3 cross 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 her;1g e90 tji m-ozxwc(h with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleo mxzhc(et9;1-g 0iw jration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard :9-f kseasog m +,ua8m3 meter abovee,ko8 9: aa -gsms+mfu 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 acceleration on a horizont m*flmi;;l(n ismi v:0al surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0l nil mim; :(fvsm0;*i 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 withezd8ltupu c-h( myj* ko0;*4a uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in thi0 (4jaeu*cz ;dhl *-uyktp mo8s 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 3.0 kg blogr1pv 8 ona05kck for81r voap5g kn0 5.0 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 riyn c ;dv93a;ubght is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest a 3du;a bc9vny;nd 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 frozen pond throw)2gz bua -.nuzo8it4o+z4l ius 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 direction. Which of the fzzlu iu nt4o4ob-).ag 2ui8 z+ollowing correctly describes the above situation?

  03.14: A fan blows the air and w.y/l 6 bktg9oy27yiwgives it kinetic energy. An hour after the fan has been tlw6y wi.yk ob7/g9t y2urned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg h ucn6ub*5 +lnqas a position of 3.0 m, a speed of 4.0 m*u+ n nbuq6c5l/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 1j1.*b v+c mx pi trbn+2cpxx4(.3 m from the floor. If the janitor relocates 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 1rb 4j+ x*tbmn+1pxxc(pvc.i 2 0.0 kg.

  02.32: An automobile engine delivers 24,000 watts 89 gs )sjvu3f/tjipss. 9 s5oi(about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant jpi)v f j/3i9s.ss 8su5sog9 tspeed 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 wit(xg +fvu:m-i2s wb 9prh speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to th -:iwr 9pg+sfmx(2buve 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 moves with speed 5.00 m- qy4t sxvtkd4hi0x 4qk3v pihz:( q,8/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the incline as it idvv4 4thkt(q:sqhx3pqx,-zk 8iy 40i s 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 starting from rest, along a ni*isn-el vd+pbxq eg. k m* 9+7qr;+yvu3vq(straight road. ru9givx+plvs;v*(mebnkq +yienq3q . 7*-+d 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 of B?

  12.07: What is the net force acting on the object during the timesh1 vt3xv p; yt +*v.9)pargri interval of the arasvv+1ti hy p tp3*)rvgx;9.cceleration?

  12.08: Through what distance does the object move during the time interval2 n5izsp cvz kc7:,-dsfjzx1 8 of the acceler15nsczks-x72, :cp8 f zidvjz ation

  12.19: The magnitude of the linear momentum of a 4.00 kg poinb j8n30h kqf8t(3o pknt 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 th83qkjnn0fb kt(3 8o phe kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic en ,qp0r,8 *qk ps.tgimjergy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represent,m t0gsj.8,qp*rkipq s the mass of the crate

  94.38: A force F at an angle θ above the h +nbi1gi cf0k/qrx,u4orizontal is used to pull a heavy suitcase of weight mga , rxbfii uqg0n1c4k/ +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 is:

  14.31: A toy crane exerts an upward force and delivers dy rdbhr6w/(5 a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will thydr/ hb(rw 5d6is crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released qole4+deme/j05tk +if dt/ 1s 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 work on the eet /+0j4tk1 sf o mideqd5l+/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 balvsv65ktj79yj gmv2zv8z2 o y9pyd8 :q 6v-mlrl is held motionless a height ho above a hard floor and released. Assuming that the collision with the floor is elastic, whpsl y6zmv52kvrj:6yt9d v mgv v9qy o72 j8z8-ich 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 driver sees a barrier ahead. If ; d(a,2jl/xq r+yec*t bz .l87 otrvmothe car takes 95 meters to come to rest,zoj(qbr+a tre ll,/7*.2x vomc y8;td what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving ak+1q ak,zbdq(j e vh-;t 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied whiza- ,hqkv1k jeq(+b d;le it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identi u4)bo ,cr )ag;obhvmhr+gwxf.43 mq-cal kinetic energies of)r3c )wvm4hbqb,aomgr.h 4u-xg ;+ 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 5zqjmt3sz 7dr ( bf6z.the air with an initial speed of 4.60 m/dz rf.s63z5 mb7j tz(qs. 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 upg.z ;d)4;)fovq5 1ofcxi xyzwward from a flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface with speedo1x;f;c. 5zox)4yq gf wi) vzd 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 the boy?

  02.48: An object of mass M is dropped from aheightH above the grlliv3g 4j1 fo6ound. 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 consta3l4goj1liv f6nt 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 thzj5: 7vq.-jn)iu bh2r/jces6 yhi( khe 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 mag )nhs-hib76j hry5:cev u/qkj z2(.ijnitude of the average net force acting on the mass during the collision with the surface?

  96.38: A pendulum bob masnde.mkkh:1lt/:v4 48ebbab ss mon a cord length L is pulled sideways until the cord 4es baehlb::vk1b.4kd /mn8t makes 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 slebajr76/c p,g g m-.sgwlk hr,6d, 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 bbcrag-r/6.mgh,g jlsw6pk 7, ack 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 sidewalk, along a 10iev;iyw3; m 1e-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each cartow v; ey3iim;e1n has a mass of 25 kg, what is the total work done by the deliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is applied for t+ zyog8v ;ft:ihe 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 beszyo vf+i;g8:t t represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowlin0uzt /a-*hmcg of08qyg 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 strikes the ground, how are the mechanical energies of the two balls cy08oq0- *hfaz gm /tcuhanging?

  11.28: A person throws an object of mass Mrcyo 90p.h:jt+tna 9o straight upward 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 upwat9yojpr .atohn 9+:c0rd 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 stretchesd.v((zhw;g,ikv0rmi2 4dk bx a spring that has a spring constant of 20 N/m. The potential energy stored in the springv4xkhzid dk(2i( 0 wvr;g.,m b is:

  97.10: A compressed ss eik7 v)dy.d.uugo9f8h1* st t+y4a cpring has 16 J of potential energy. What is the maximum speed it can impart to a 2.0-kg object ?yi 4egk 9v*s.t8ysdcaoh .1f tu+du 7)

  

  10.31: An object of mass M starts from rest at the bottom of a fixg2 qq4q-/eewf p(szu1ed 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 trials? Assume the same constant non- zero coefficient of kineeq 1p2ws -u/gzq4fqe( tic friction between the incline and the object for both trials.