97.01: A force F directed at an angle of θ e uv /r y62nrfu98)dtix o1k;b above the horizontal is used to pull a crate a dur);vbux 8fer o16kyd 9ni2t/istance D across 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 wi36 vk p; 6l2)mpqbppagth horizontal speed v. While bringing the ball to rest, her k3ppa)q6; plpm2b v g6hand 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 z/ jc0si3/fp9 qdhtt3wallboard 3 meter above the floor for 4 seconds. During these 4 se c/f3h3q itjdpzst09/condshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizontal s8/i7a ri (wg(v1)ya;girilod urface for 5.00 s. The block’s kinetic energy y1awoila;/ r)rii( 87gdiv(g 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 uniform acceleration on a horizontak* jkn c7h eb55kts2m xrn17i)l surface for 5.00 s. The block’s kinetic energyrne tkx7hnkm kj7bi5 1 )s52*c 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 direcj 0.+i/tnfnksted to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides o .nn+kf i0tjs/n 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 o+b hrp9u b7m(gn a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a gr p7bhm+9u( bhorizontal 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 throws a dw x0 ) 0q+gt:vqev c5os.tjo(1 kg hammer in one dvsoqej 0+cx)5tg(wodqv .0: tirection. 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 hour after the fa0v/ 8qmsd3e5cthocr 7f6 8okvn has been turned k/ mq6to 7c5cv0f3o88 ds erhvoff,
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, a sydwmv2 uzgfvf+ 2( d5dk8/,o vpeed og,fd(do w v 5fdy8vk2/2+u vzmf 4.0 m/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 t imi2i39n1fz ,md fusn*bmnf*p45 o1ihe bookroom 1.3 m from the floor. If the janitor relocates the box to the shelf that is puioi3f51i1n n,2 imnfmd *49s*bfmz2.6 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 24,0i3v7i 42 wut+h 4qum.iacez*t00 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a consta m4it izi3wa7* 2+ute4 c.vhqunt speed of 30 m/s (about 65 mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure m(b.qa 3uf 9xnto 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 2.50 m/swhen it reachesafn9xqu m3( b. 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/s at the bottoe8e2p0i9 ntmz koedjl q86 a7)m of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the incline as it is being pushed directly tod89z8jmla6 e tn27 o0pq kie)e 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 froo.y2en6k goir0 * au3jm rest, along a straight road. CarA 2*eo gy.nuiao360 krjhas 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 time interval o03 3*og4 lg2tbpvr-t vtd nep3f the accet 4 epn0r2to b-gplv*vd3gt33 leration?

  12.08: Through what distance does the object move during the time interval of t/hjktm c j,e3d29fx0.c ee m2nhch f.j /te20mkj3 2ncd ,9xmeee acceleration

  12.19: The magnitude of the linear momentum of a 4.00 klzh5.pef)bfx xm:p 5nebi-vx3) d;* rg 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;.x3f- 5 mh5)ilvzbx ne:rpdxbp f* )e in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speerlp5-ey*. omu d is increased from 2.00m/s to 4*lop ue-mry 5..00m/s. Which one of the following choices best represents the mass of the crate

  94.38: A force F at an anglel)1koxvxbe8x8b+7n a 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 is μ. The work done by te8 +x7b)vb8xxnok a 1lhe frictional force is:

  14.31: A toy crane exerts an upward force and deliversk o+-n0, vume;vgk*cy a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed wilv+kyo cn g*-u0kmve, ;l this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is r60k07 ye h lbm-m/swmneleased 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 object as it falls 1.00 mto the ground, which one of the following choices best represents the /bwky-0 m0sn6 emm7lhamount 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 abovamx38kn1 e rl8e a hard floor and released. Assuming that the collision with the floor83xn8ak1rel m 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?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees ayhol2gn i9j+; barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force necessary to st nl2jio+;y9 ghop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it stops. If9gr h yga2w(hcg+ku () the ball tracggrkh9y )h(u 2+wg( avels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of dikoz:/c12 bah3 kqt1m) nu b*wafferent masses but identical kinetic energies and the three following statements. Which of the above statements would be cor*12cmn bhbq/ao3w ut 1za:kk)rect?
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 tosseo )mqatxv h0v8d6 9)py (-pfgpd vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches itspop- yg)amt d0 (fxvq9v6ph8 ) highest point?

  06.20: A boy jumps from rest straight upwarj9t*pww e 1g 7+jm41w,cn 3iw dddrb5pd 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 c5ermpinjj1+wt *37bwg9pw ,4dd1dw 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 theshzg7 b l8s2e8td6or( 0w/dgl ground. The object(t2 sgsobw60dd7/hl zr8 ge8l 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 ground on the object while coming to rest?

  12.48: An object of mass M is dropped from aheight H above the ground. The o v()ravrvz)2 4p6k oq5kj lvj6bject bounces off of a horkz rjv)kv62oaql 5 6vjvpr()4izontal 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 cot(tsx82oj6k 4c ,dh elrd length L is pulled sideways until the cord makes an ang 8ote4(s kdhc26x ,jtlle
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 -p*e6 ocpop/runiform incline of unknown angle. The sled, which started at the bottom of the incl-6e/p orcop *pine 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-metbk oi2xf+3yy4xufs.4umna*d+o 2jpg5 h:aw/ er 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 deliveryma3bgoms ux5xjfa2+n*4y+iwk yo.fp4:d/ 2 u ahn on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as show h rsc.btvgae/wf87 (id7bq- 0n in the figure) is applied for the 6.0 meter motion of the box upward along the incline. The mass of7 8tced7hgq(frivs .wa 0/- bb the block 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 froolf/1ky/.gkpoe9+hn wk :g;hm the top of a tall tower. Ball A is dropped one second before ball B. After ball B is dropped but before+p1w .//flgknogk o 9h:;hk ey ball A strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an obje bifbj jz2b aem/5pj o1h923x*ct of mass 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 0.5M straight upward with initial speed 2v. In terms of H, to what maximum height does the object of m/p2 39jbhz o j25je1abmifx *bass 0.5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spr:d*t np6tf*+arslj 74 pv*phqing constant of 20 N/m. Thes7***tptvpra6h: lj+ 4q npf d potential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. )d r.:-b yl)hu, rn2 eecobeqdeg +*3rWhat is the maximum speed it can impart to a nee)q:d *ro3) be 2 gcbeyhr-d.,rul+2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed inclineu5ekh ) o) zg33j7upka1ebb d(vae 6:j 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, t6ke53bu )ho 7)aj:(1gv d ekabezju3phe 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.