97.01: A force F directed atgl k 2(.i1pwpa an angle of θ above the horizontal is used to pull a crate a distance D across a level floor. The work done by the forc(ig2.pw k la1pe F is

  97.33: A softball player catches a ball of mass m, /w o7bzia a.n5khn+e3n;o u d-which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. As-+z7u3. ne;hao5 ndniawk bo/suming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 3 meter ayl cn1 rr-4lm8g-t f/((uqx on 5k.xzjbove the floor for 4 seconds.5l -/(yf-otxmkgzrj8lx ur .n(c nq4 1 During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform ari+8dq echm9i1ym*9o cceleration on a horizontal surface for 5.00 s. The or y *ehm9mci+1q di98block’s kinetic 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 bpc9f 7 pe9;1vr msi1gzlock slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic enes;17p 9pe v91gz rcfimrgy 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 exerted5bl.b f-ea3ha on a 3.0 kg block for 5.0 s. The block was initially at rest and slides3h.labfea5b - 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 ijww1f2q 77og a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal s 1ij2owgwq7 7furface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at r 6x f:*r;ag7jja peh+eeston a frictionless 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 direction. Which of the folla*+pee jx;6a7 fgrh: jowing correctly describes the above situation?

  03.14: A fan blows the aiy2ozn9-/agsoo bk0imh m( 9d0 r and gives it kinetic energy. An hour after the fan has been turned off, /9z0- ikmdosgy( b029hmanoo
what has happened to the kinetic energy of the air?

  09.05: At an instant, a bl4 idxdzl-s: ;dock of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an acceleration:4sxl dd ;-diz 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 mid j- w2xh,yizlft ty19 v4+qyg,dle shelf in 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 mucq1ywlz9tyit fxj h, -v+2yg4,h 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 horsepower) of oc:eo.rp( ) p uk toau*n0kxt;87z1hmpower to a car's driving wheels. If the car maintains a constant speed of 30 m/s (abox:mtkchto n7 1 0a ;ur8.p(e)ouzk p*out 65 mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to leg0u*t hz2ae)j;(.sr8vl cm 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 inclinem; r )se(hu*vt0z ea8g.ll cj2 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 spe0wi1p-d27nsz p v3ts jed 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, has a speed of 2.50 m/swspp2dit7j0wn3s-z 1 vhen 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, j9laas9-qnzja)y tvq (m /u++ each starting from 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 the same distance F, what is its speed in ter(++z)us9al aj9v-/tmnaq yjq ms of B?

  12.07: What is the net force acting on theh.e sj5;kwdnt4 /xq tty:7 ,hy object during the time interval of the acceleration t k/q.:sthe;ydxh7ynw5tj,4 ?

  12.08: Through what distance does the object move during the time interv6.:be2zebs*ffhw bzrl9 g v8x .3 kf3tal of the acceleratio3e:vf3b2*z9bbxz wg kl6she. 8f. f trn

  12.19: The magnitude of the linear momentum of a 4.0 koxqe z1f l/4n*)ziz;0 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 duringq)n*i z;x14 zolfze k/ this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its sp sd10+uob d)w)zm9q 8x9fznf heed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represenm8nzfdd h)b wx)uo 109fs9zq+ts the mass of the crate

  94.38: A force F at an angle θ above the horizo)2xy 8ntf8*)n,wm myf0sqeo3 q n9tdp6y2 bjnntal 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 the frictional forcenms9) )yowdnf32t 2y 80b 8q6ynpxt m,fej*nq is:

  14.31: A toy crane exerts :q:xeocx418.c 3r.nr :gabzz ix8vvfan upward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this cranq rve1fai c xor.8x:g 8.n4:x:zzvb c3e raise a 0.20 kg block?

  12.18: A 1.00 kg object is released fo )73c0gty5rocf6 rt rcm 5u+arom 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 amount of work done by the gravitational force acting on the Earth by the 1.00 kg object durin6 +) yoo57gc0r5 u3 rmrccttafg the fall?

  96.18: A rubber ball is held motionless a height ho above a hard fjql 4)is*9kjjloor 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 thsqj 4i*l)jj9ke 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. Ifm;1hklu qs .osbj(3n 4 the car takes 95 meters to come to 3n os u mhj(l1bqsk4.;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 s :ad,azf1) /-h z(bbvkxuzw b1ps.of -lows down uniformly until it stops. If the ball travels 15 meters, what was the average net force appliz- :wbx/sdfaf ,pk .a1zu1h-(zvo)b b ed while it was coming to a stop?

  02.26: Consider two laboratory cartsm5a e307bo oqy of different masses but identical kinetic energies and the three following statb 7o3oyeq5 ma0ements. 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 to 4oem;(xnj.bt* c ,czwssed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the c(4ctcxnzo *,bmew; .j hange in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upec) 5q,hbzt gf (q+qi,ward 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 t5,(b q+i) ecqztq ,ghfhe 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 aheig6shqiq34*qa)+ q yogy htH 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 constant force exerted by the gro4+gi qhso yqqa)*6y 3qund on the object while coming to rest?

  12.48: An object of mass M is droppegk3n2 yj)y4be;p/t pf a 3da5xd 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 onnpgkdbyt e yx3af/42 5a3);jp the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a+5hy xg(. u73zmlx llo cord length L is pulled sideways until the cord makes a.zllgo(+h m u5lx7yx 3n 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 rx-ofu 68cwk ;y3) 2;onnn xmtsled, 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 hill. What is the sled's speed when it returns to its original position at the bottom f- 2ckym6 nt;8no;u wxn3)oxrof the hill?

  06.09: A deliveryman moves 10 cartons 8i-zdbz lxbo6;1qov(x r66apfrom the sidewalk, along a 10-meter ramp to a loadin-oq1do66v( ab pix;lr 8zz6bxg 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 (as shown in the figure) iw lv2nqa- /rf/;tw*gas applied for the 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 best represents the work done by the force F onthe boxt2vnaa*/g r f w-/wq;l for the motion?

  04.48: Two identical bowling balls A and B are each dropped from rest it9po ncq(5z8 t x5p4j/io*)2worc,rq9g pm z from the top*qim8p4rt992 o x o/ j5cqgw()pirz pncoz,5t 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 changing?

  11.28: A person throws an object of mass M straig;p8xbjlu b /wdi4;e2 oht upward with an initial non-zero speed v. The object rises to aublw;o4 2dxi8;be pj / 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 constant of 20 N/mbxo59- nam,hb. The potential energy storen x,bb m5oa9-hd in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is4, qat kcs*snk2o0+ny the maximum speed incksqkt *2ys0+,n4a o t can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts7 9tvfj8.n )oph3lujd 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 person on the block cofl tj)up njh97o3.v 8dmpare for the two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.