97.01: A force F directed at an angle of θ above the horizontal is used tox;4e5 6ezq mcr pull a crate c4xqr5 ;emze6a distance D across a level floor. The work done by the force F is

  97.33: A softball player catches a :y6jt*jk 2 khwball of mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her handyhktwj6: 2*jk 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 wallboard8b, r dq, a.gspu+r5bg 3 meter above the floor for 4 secondsu5b.q8grs pg, b +a,dr. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg b n-irc38y s 2plw:187xvpwd+w,y vqwalock slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50ww8ap2vs1 3+-7wxy8i nqd lp rcy:vw,.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 accele l /f/am)a 0iwczs05 tz;x0cwx/wugt 2ration on a horizontal surface for 5.00 s. Thet/tws caf /c;2 wxa/ix)5zz0g um00lw 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 exerted on a 3.0 kg block fortrxwyf5-/ :k0 eq mvl- 5.0 s. The block--tq vw/yer x:k0mf5l 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 right is exerted on a 3.0 kg c// v ;bir5d,zd klq;ukac3 *xblock for 5.0 s. The block was initially at rest and slides on a horizovbd rqkl5// x3 , ;ikca*;cuzdntal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at aenrf:lz4z m n j7h4 w-k(t5+ureston a frictionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one directiot -w4zmja he:+5frk z(ln7 u4nn while the student moves off in the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the ,8b y4qcfw+xw+ ljj3m (osu0 ja6a*bbrwrw89air and gives it kinetic energy. An hour after the fan has s(bww+8 6jr9rxlj84w+ oa ca0,uwqbm yb f*3jbeen turned 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,l(t r v9d,xj k5kzqd( b-z./ogo*v7tu a speed of 4.0 m/s, and an a oq 5txz 9(vdr /*zt,k.vdl -o(bkju7gcceleration 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 i q;9ehhn +htz/:qsh z6n the bookroom 1.3 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. T9h: +ht/eq;zs6qhzn hhe box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepower) 5/aj2qq w-qog iez8 h5of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65 mph), what is the magnitud 25gaj hqoq- i/wze85qe of the retarding force acting on the car?

  09.13: In the figure to th* i- bzjcg+p aghc )0g+0ybd)ce 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 itgd-j b0cgyc+*0az gbipc) h)+ 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 7s16izy1tw3hwft0 7lj g(j r jthe 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 direwjy3jfti1(6rl1 tzw 7hs 0gj 7ctly 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 regy9w e.8 cdtl j4yld:8 /kxza9st, along a straight road. CarA has twice the acceleration of Car B. After t 8x8 z/cl9.9tyagy4k : wdlejdraveling 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 actin5 y1qlofw2um2 g on the object during the time interval of the accelemoy5f 212luqw ration?

  12.08: Through what distance does the ob t6,4agj-q8 kk4jb lptject move during the time interval of the acceler864gk qtt -blj 4k,pjaation

  12.19: The magnitude o *x8.(ybm quwqf the linear 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 energy of the mass during this time (*8qu. xywmbq interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is gts(0x9, o7tcs6org sm* 8safincreased from 2.00m/s to 4.00m/s. Which one of the following c6mo8sxs9ts 0(g* gcs7r o,tf ahoices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull a h z,-qfli :h-9pahks0 beavy 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 thez bfs 9 ,lpai-k0hhq-: frictional force is:

  14.31: A toy crane exerts an upward force anc 8mvpajva.+ (d delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed willpa.+cv amvj8( this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released fromjxpu hf/8o vw*q-h;9b 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 ;9w8*vfb xh/o-jh pu qobject 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 a height ho ayim gi0 .kf8agw ,51khbove a hard floor and released. Assuming that the collision with the floor is 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? a0 m5,ii1gykwkg. 8h f

  07.06: A 500-kg car is moving ax 8v8r;t,z-oeoa;mp at 28 m/s. The driver sees a barrier ahead. If the car takes 95 z8xo,-a;ae r; 8p ovtmmeters to come to rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slowq 2e5)v 2m/tq0g.prtofv nyhk 2od()os down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was coming to a e tno)(2tfd5q)v. 2qogm2hrk/yv po 0stop?

  02.26: Consider two laboratory carts of different masses but idtnf7, cb4 38p-v.uht eqp q7kdentical kinetic energies and the three following statements. Which of the above stateme4n7chfbd37,t8qte k-.vp q upnts 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 a* d qq/j rf.i5d1qgxibm96k.vn initial speed of 4.60 m/ *6.9d1qk/ ibqmiv.fg xrqd 5js. 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 upward from ng( 43gccs/ 4m,1qiyddww g3sa 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 theqi,ds g y3w(dcg n4 gc/s143wm concrete do on the boy?

  02.48: An object of m, if4kco7 x7jf+lit+kass M is dropped 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 average constantci7k+x,fl4 iokjt f+ 7 force exerted by the ground on the object while coming to rest?

  12.48: An object of mas ky3bybp.1 n0sky( x8is M is dropped from 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 average net force acting on the mass during the collision w18ky3yp(ib n0 sy.bx kith the surface?

  96.38: A pendulum bob mass mo yngdi- gcw :94c-u9ykw-rhs7.3 sccon a cord length L is pulled sideways until the cord mayy -scwu ndi9- rc9k7shg cow:4 g.-c3kes 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 unil8tmq gc837uu form incline of unknown angle. The sled, which started at the bottom of the inc gu83m8lu7 qtcline 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 its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 10-n:a: *ym ccj5bras9 h6meter ramp to a loading dock, which is 1.5 meters above th:jb *a:h9s6c rc myan5e sidewalk. If each carton 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 app9 xyn*0x usq5zl93x vhlied for the 6.0 meter motion of the box upward along the incline. The mass of the blosz v9 *u0x395hxqn ylxck is M=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 balls A and B are each dropped from rest from kx iz8 )u4)wl p5;kzfxthe top of a tall tower. Ball A is dropped;iku8 p zklx) 4w5fx)z 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 changing?

  11.28: A person throws an object of ma nn i(nzwl+h: j4pf4q+xc8+egss M 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.exq n4 n+fz8igl (4 cj:+w+nph5M 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 bp0c53 i apybkkt,f)) stretches a spring that has a spring constant of 20 N/m. The potential energy stored in the spring ifb i,yt0)a)k cp pk53bs:

  97.10: A compressed spring has 16 J of potential energy. What is the ma* shg cu*do 6/nt8cx(qximum spexu/tc(ng*s6c d qo8*h ed it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from nw 1 ,kfj 2xkqvn4tc94rest 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 trials? Assume1n xw kf4c2kv9,nt4qj the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.