97.01: A force F directed a*tfgnc yy)req8w rnh(wp z u**wz9i 39q5:fz.t an angle of θ above the horizontal is used to pull a crate a distance D across a level floor. Tyeh8f*:q z3fpgz.rwri5c qt*wwn9nz (y9*u ) he work done by the force F is

  97.33: A softball player catches a ball of mavrg1o 0ol)dp8z+ rmr 5ss m, which is moving toward her with horizontal speed v.0)ovzr lmo rrp8g+15d While bringing the ball to rest, her hand 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 kilog2vozwas8yl7e wjz:d ax (l*w fqg//.7 ram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 j y( 2 wavsz7/8w*:o zlg7fle/.xwadqsecondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with u7sjo5 :(-s ;udutyre aniform acceleration on a horizontal surface for 5.00 s. The block’s k u7dra- jo:us5e;(y tsinetic 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 b h95ifp0 ixuk,7covizi 7/2pklock slides with uniform acceleration on a horizontal surface for 5.00 s. The blh0zf xi7oviu icp9ik 7pk/, 52ock’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 fomv3 ck ynfa1h(ex8s :ygh24*wr 5.0 s. The block was initially at rest and slides y:h s e43 hyg8acnv(m 1xk*f2won 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 exrbh:6j6w(p2;xhdt4d ej3 zj gds;y 3m erted on a 3.0 kg block ford2:j(hpmrdj3s; yjwbg3th6 6x z4de ; 5.0 s. The block was 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 frozen pond throws a 1 kg wzz4:au .t) lohammer in one direction. Afte):wa uo4l .tzzr 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 aicix 3k*z8b8h hr and gives it kinetic energy. An hour after the fan has been tur8 *k8ih 3zbxchned 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 ofxo4 la,o5hvs8aol ;(u .5qo)/xumapx 3.0 m, a speed of 4.0 m/s, and an acceleration of.xo5;m)5alvo lp oax ou/4qx ,hs(u8a $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is on the middle shelf in the bookroomnoev9mh-2-kq l u e/vr-4s ru/ 1.3 m from the floor. If the janitor reloca49-v ee-u2/n/hl-vqm rrs uoktes 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 deliveryeeg0js7 *f i 0efknsx-p nwm38(p ,m2s 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (png e0 8*,xy 7pffw- (sikejsnm2 m0e3about 65 mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a bo8iao .ldh-,rg6ij b q;x 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/swhe,bq il-aorig .jd8 6h;n 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, ac*5r+t*u l0p,k,au0toec afk 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 t+ o* ,ac a5t0kpf0ut,kleucr* he 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 ldkv2(x( wpkek ,9 s(jfrom rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car B has traveled tks l2xk( djpkw(9e ,(vhe same distance F, what is its speed in terms of B?

  12.07: What is the net force acting on iat/oy ko)5g6ifwl9; the object during the time interval of the accelerati56o9io ;aflti) /kw gyon?

  12.08: Through what distance does vwz c u -1fg3qz0w5er6the object move during the time interval of the age-cq6 0 5v fwz13rzwucceleration

  12.19: The magnitude of the linear momemr hbzw6-b-n; ntum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.0b;hmr -w -nz6b0 s. What is the change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is incsy 4i1o6ly+rm9an xjilk64*, bv .ezu reased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass k9i1j,4ysy.m *xnlb 6a6ziu eo v+lr 4of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull a heav5fj94fjt z9ee lqz,agm)u..s y suitcase of weight mga distance d along a level floor at conseqfzl4, t99egzu f a j.msj.)5tant 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 a useful power outputd;zwcft;. csayex;k1v /a v( : of 0.10 w to raise a block vertically at a constant speed. At what constant speedvvat.c fex:;k(cadw1s z/ y; ; will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near fn(t2)tqy ;fe the surface of the Earth, the gravitational force actinftfn y)(t2;q eg 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 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 mot u:67f,f(5io 6synnwdn t)npr8nry7sionless a height ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of thns7rs n) ty8pr(67f:ond ,fnw5 iyn6ue 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 th ;,l/z+ 7hpo2hicf cvbe car takes 95 meters to come 2zoclh/ f 7bc; ip,+hvto rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball movik07 k. cztelvd(w tmr:jcn+-+ng at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was cr(7 new:m k. tjvlct0z-++ dkcoming to a stop?

  02.26: Consider two laboratory carts of different msnuagfum1x91v4 *)t lzdr .h0asses but identical kinetic energies and the three following uuv fg1 41*srlzh )t0mxn d.9astatements. 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 the airluz.vyo;(qpx+9hf- j with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reachexj -+fuzl(9 yvoh;.qp s its highest point?

  06.20: A boy jumps from rest straightm:y 3l:nl .ypr upward from a flat, stationary concrete surface. The boy, of mass M, leaves the concmnr. : pylyl:3rete 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 concrete do on the boy?

  02.48: An object of mass M is dr)rhycfl8i msmj x: u og)ce7qx. w:8s167 e9rdopped 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 resistaxw)e8s 6.ro)us78 myd1 c7 ::mqfrxjiglche9nce 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 abr72b d /+zdzw0orr/t3 thlrh 0ove the ground. The object bounces off of a horizontal surface in a collision lasting time T. The objechtz+l7r300 rrdb/ozh 2rtwd/ t 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 cord length L is pulleg/ 6 )g2cvwc3jy8vuw ad sideways until the cord makes an angle/3vc)gg2cjww 6 yvu8a
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 kp 1bcmla3;3:vt1q u6g7sc tqangle. The sled, which started at the bottom of the incline mtmuq;atq1p1k 3g6sb c 3clv7:oving 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- mmr91k;: xwiemeter ramp to a lir9mxe 1:;km woading 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 move them to the loading dock?

  12.16: A constant force F=50N (sb+,w0 (kn+6.3+r btcw jayr c0re ciwoq9v3eas shown in the figure) is applied for the 6.0 meter + ,ywvw bc r6cc9t ebs3(qrr3++k.niw aj0e0omotion of the box upward along the incline. The mass of 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 fhf/d+6htai9xv* x:d 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 ba/dxtx6:f9d f+h*ha ivll A strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upward with an initiaect+9: reg0qk9*u o/3m llgwul 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 ofu gcmk*e l3l:g9owe/+qu09 tr mass 0.5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring thz3ybg -l9y8 psat has a spring constant of 20 N/m. The potential energy stored in the sprinb- ly9 8spygz3g is:

  97.10: A compressed spring has 16 J of potential energy. Whajeerg/h n 8(-qlqjpf :y+wt szn:/4y)t is the maximum speed it can imsp8+gjy-qnw ynjeq e (tr/h )z: f/:4lpart to a 2.0-kg object ?

  

  10.31: An object of mass M sta( ( 4ayifhlm/trts 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 omy/ti4h(fla( f 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.