97.01: A force F directe)ijg.s4i k0mo d at 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 fomkio4 si g)0j.rce F is

  97.33: A softball player catches a dnhgw) s*;belhpsw 0f5 )+g,yball of mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand my nsd eg+fl)0psg5hww)bh*,;oves 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 kiloggyt38k0o+ pipram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expendpo i8yg+3k0pted on the wallboard?

  17.11: A 5.00 kg block slides with u w ljaw2 kwetd0ro*8b-bg.z6 ,niform acceleration on a horizontal surface for 5.00 s. The block0e*wzg-,rd bj k6b2. 8w awlto’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 block slides with unan9)cm)l+:).inw lc b grrgd-iform acceleration on a horizontal surface forwg) i9:ngr)n l)cb+m .cd l-ar 5.00 s. The 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 kg9p3 85og* immz 0abrn-x8ttlg block for 5.0 s. The block was initially at rest and slides on a horinlm*9t-gxi35 8zt 0gm paor8bzontal surface.
What is the speed of the block at the end of the 5.0 interval?

  16.12: A 12.0 N net force*4b bgkfmb7 7r 5d0rmak7i2po directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal o504bk 72f 7r 7rmbg*kabdpimsurface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at re2v9fx (qq z2hl7 x8cbsston 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 mohzv2b 8x2fc97 (sxlqq ves 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 ep/f; -gg8 ti bh+tqv-unergy. An hour after the fan has been turned off, f+/i-vu;h-p8 g ttbqg
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has a01 bc3,xzbzae3kf.z k v hbs*. position of 3.0 m, a speed of 4.0 m/s, and ,0ekvcb b. xk*zb.ha3z3zfs 1an 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 theum4/jiq:3pl5o ave6 hbx2l0j middle 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, howj 2ua5qeb hpmio0lv:6jx3/ l4 much work does he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine deliv4/cf3: cfu;qm sn;tq ders 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 (about 65 mph), what is the magnituqu4t qcfd3/s nc:;m;fde of the retarding force acting on the car?

  09.13: In the figure to the rightgm -y4f*45x q/hrn*ga edkw;t, a box moves with speed 5.00 m/s at the bottom of a rough, fixed intn*- *fkmg qd4h;/ g4xa5w yerclined 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 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 spee)tb bj+nn,a. hv k;q+md 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 forknvm; +ntha,) bj+bq.ce 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 thl 9, f.eo09gurnmsg /yb ,1inie right, each starting from rest, along a straight road. CarA has twice the acs19fnl/0y eb.inu9, morgg,iceleration 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 r;* 76sw 7l pp* w3wmlfy0drwjthe object during the time interval of the acceleratiojw7*l p 0lsw;myr3wfd7p 6*wrn?

  12.08: Through what distance does the object move during the time intervaiy8s 0hn54yjy l of the accelerah840i5yj ynys tion

  12.19: The magnitude of the linear momb k,0x m/ydyq;1)xl:* /wez:khrvyhnentum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a kbzhyw::qv)r; ,0 /y*1 kn /hxmyedlx time interval of 6.00 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 w2fs9ox +5t qnqhile its speed is increased from 2.00m/s to 4.00m/s. Which one of the folxs9onq f+t5 q2lowing choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal*h 5pvfr( la ,lg*uho+ 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 dh* ga(*vhrou,5llpf +one by the frictional force is:

  14.31: A toy crane exerts an upward force -)kw /va7ckpsand delivers a useful power output of 0.10 w to raise a block vertically7ksca/ )wk pv- at a constant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of the Eart6u0pith)7nk nh+0/ hc n;tyq zh, 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 followinqt+ n 0hhnti7 zpc;ku/ h)y0n6g 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 above a hard flb37: jsu ozgzb0,h .y/yg b8pnoor and released. Assuming th.zb zn jop0gs hu/,g b8:b37yyat 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?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barrier ah02f oquc ja5n)ead. If the car takes 95 meters to come to rest, what is the magnitude of the miniq0u c n)f2oaj5mum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it stout bup60rphr,)4 8ie( .usofh ps. If the ball travels 15 metu,.iur8 te 64sf b0pouhr(h)pers, what was the average net force applied while it was coming to a stop?

  02.26: Consider two lab q jt5j orqj0gq+(t pq3oa ,f6u*0cr6noratory carts of different masses but identical kinetic energ0jpqo3 njug5,60c6 at*+ rq(oqfrtjqies 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 gfws92*cs 1sg,gr u(xvertically in the air with an initial speed of 4.60 m/s. Ignoring air resistancesc g1gfu,s9xg*rsw 2 (, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary concqt c qizh:a3i 4kwt-6:rete 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 6th: kc qq:i-z4t ia3wphysical 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;9a+x y4ydo 2 tqbh//d jmdpm1sbq;9s aheightH above the ground. The object crashes into some soft earth and comes to rest by compressing the es1dy4bsbq m/h; jdao 2/9xq t+d 9y;pmarth 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 2 g/fwrnv5n rnw02fu.above the ground. The object bounces off of a horizontal surface in a collision lasting time T. The object then rirru2wn/ ffw50.nvng2 ses 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 lenso;exm.3il p-(ey 6f n;kqnl2gth L is pulled sideways until the cord makes an lfs.ln ixn-6;ee2py; (m3qk o 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 g3yyr ;(zf10uz5p aigk v7 a3z sled, which started at the bottom of the incv 1y(fipaaz zg5 r37uz;y30kg line 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-meter rame(:jt *;fp yxze ;dtje7.h2/mwef6; r zpz8tg p 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 deliveryman on the cartons to move them to the lz2t8;pf*t x:6edjw j7 ee/m;r.zyhg(e p;zf toading dock?

  12.16: A constant force F=50N (as shown in the figure) is applied for f g: dllkrq5.tv+9e 6eer: t*ld;/uat mn.n p2the 6.0 meter motion of npm +l5rfetla tt/.d6 2 *dgr:e.9:k;lqeunvthe 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 ballkky6rb o qkhnp+ 0,,kjwm;af06/ k:xws A and B are each dropped from rest from the top of a tall towem :;xarkfw,ko6y q, h/ k+kbn 6jw0p0kr. 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 throwsjwli7euix ja/d) vit,l).1w* an object 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 withl*tj7 iwj.1uaw,eix/ l))id v 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 fa)mjf; 8cl l:k) oo1a0,ij5t tk -j)o9kcbaw that has a spring constant of 20 N/m. The potential energy store1ao)m k j8 wibt:lo-kt cfca9,jj;lfka )0)5od in the spring is:

  97.10: A compressed spfr, p+e2j *b wl8u0ld9 aciz.nring has 16 J of potential energy. What is the maximum speed it can impart to a 2.0-kg obawe,n ui89d clrlz fp*b.j +20ject ?

  

  10.31: An object of mass M starts from rest at the bottom of a+ thjvb4;oa *k 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 4o*;hbjvt k+ain 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 kinetic friction between the incline and the object for both trials.