97.01: A force F directed at an angle of θ above the horizontal i-r/ice-9 u bd;wk lh-ys used to pull a crate a distance D across a level floor. The work/;-ihkur e-b-dy c9lw done by the force F is

  97.33: A softball playpwpfs76m 8,4,byj 58ujwdw oler catches a ball of mass m, which is moving toward her with horizontal spey8,os4p l wd 8mjfw5ju w67,pbed v. 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 kilogram she7b,/ebj( 6 l:esm (8qtp nlqtket of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much p bnb 76l(k(etqq:8,em sptlj/ower was expended on the wallboard?

  17.11: A 5.00 kg block d0 ;hytppbxo*cl.-h h(my-z 3 slides with uniform acceleration on a horizontal surface for 5.00 s. The bloh hyyp lh;pxz.-(mc3d b-to*0ck’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 b/b(i oy /gs ha;pya -8owjw3l4lock slides with uniform acceleration on a horizontal surface for 5.00 s. hy;p a3-yb(/84a/jgows oliw 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 ex)f,c75ejufw q 2ayau7 erted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontwuf a7ay 2jq7uce)f5,al 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 te o1a/r-m)bbz2k;l wx o the right is exerted on a 3.0 kg block for 5.0 s. The block was initially/)a;rkb 2loezm w1b-x 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 k+4qixiecc* 1qg 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 following correctly describe1c4cx iq i*+qes the above situation?

  03.14: A fan blows the airw+y/fnpz a 21f and gives it kinetic energy. An hour after the fan haapnwf1 y2/z+f s been 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 a3r1d ,8yfnc(bst k95zhuv ,zn position of 3.0 m, a speed of 4.0 m/s, and an accelen3k ,y (d8 1vucznt,5zsb fh9rration 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-c / cba0+9q8z yt+daa:ozbfw the 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, how much work does he do on the box. The box hasob:d9c awq f/za8-b +cazt0+y a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (ab(v(*qoimfz)*yk l8c egeu- 8zg xgl931l nq5pout 32 horsepower) of power to a car's driving wheels. If the car maintains a 8zgkl8cg)i qq gmo(39e*f1 l -puvnl (y*z5xeconstant 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 to the right, a box moves with speed 5.00 m/s kou8z3cc jh; ;+o 6dbfat 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/swhend;u ob +coh83; zkc6jf 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 speed 5.00 m/s 1g.);po ,mm6n x-cbwhs xmq1 wat 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 cx-x wg hqm;1)o1p6,n b ws.cmmonstant 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 7m6 b(nqhj7 u klqhh23from 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 thqhl ku6m3(jn72 h7hbqe same distance F, what is its speed in terms of B?

  12.07: What is the net force actiqc4 eaw fg41)sng on the object during the time interval of the accelegq)w e1f4sa4 cration?

  12.08: Through what distance does the object move during the tz,cvk 8v7.iv aime interval of the accev, zv 7vcka8i.leration

  12.19: The magnitude of kg fr0wq;e/-3b6r azk the linear momentum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0re;/ rgzab-6k 3w kfq0kg.m/s in a 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 88i,lccj vy3l kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents, vc8j8iyl3c l the mass of the crate

  94.38: A force F at an( lsc9lp.:d um angle θ above the horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constantlu l. 9mscd:p( 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 oun77rw-p bz ,n.visvn* 9rp;pn tput of 0.10 w to raise a block vertically at a constant zprnn*v 7 rpwns9bnvpi. ,; 7-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 s cdf,9wc:;uc 2byqv: rurface 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 c,yb:29rd fwcq :uc ;cvhoices 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 a0gyv0 q(6va pp hard floor and released. Assuming that the collision with tqg 0v0y6( ppvahe 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.+,5 q ueow-mx;w tyd8jw/yqv7 The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force necessary t+wux; ,otqw/ye75w d-8j vmyqo stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly unt;6lijptlykg)0xcll6 6 qfv, l)s1 ld8il it stops. If the ball travels 15 meckx,s16 gd)8;60lyqli 6 jplvltll) fters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of :kdr 3qa:xv+e different masses but identical kinetic energies and the three following statements. Which of the drkxaq: v :3+eabove 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 th9nx av:-5d6rlr aj8vee air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it v n6rx8-e9lrav:dj5 areaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, s(n0 0kpgqu sjt c-0,xot0,1rkj y9laftationary 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. -o(pc0xnk j 0fsj tgq9,01rl0, yuakt 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 fr4* lb x3exmhan)70lqv hj4m ii1o:q 4tom 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 constant force exerted by the ground on the object while 1v)44tx*4jae qhxih7li mlnbm0 q o3:coming to rest?

  12.48: An object of mass M is dropped from ahei -d*rf7s;ntuhg -c(6; w gwvynght 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 twvgd hr*7sw ;;y(f-cngu t6-n he 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 lekqgvvc.8dx 1 .n q8c6,ydp 1egngth L is pulled sideways until the cord makes .e8nvpk186d qvcdgq g, .1yxcan 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 sled, wh)*+zh9 g(otlxjevm 2* tvhfi, h9o1,)ladg d xich 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 (9g1lo9x o d*m),at+dh)zxgh*v,2 ievl j fht 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 10m m+o7rjv u)rgk-i4.u-meter 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 deliveryman on the cark -urg+m4o7i) uj.vmrtons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) i.b8 pgcwkb5f+r/d3z0t j: bbys 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 box for the motion?p8 :.w+3b0b jcb/5bd fkgr yzt

  04.48: Two identical bowliau zoq mgjo,(3/nogd-+ ,4zmang balls A and B are each dropped 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 ball A qja/4 gmunzo goo,ma+( -z, d3strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an obj ggryf *1d+j3gze7 il;ect 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 g;*7zgirl +jde1g3fystraight 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 )wcg 9v)3knkx of 20 N/m. The potential energy stored 3xk wvnkc))g9 in the spring is:

  97.10: A compressed spring has 16 J of potential energy. biuf)q-.em) skwh s*h02dsrsna )*v 4What is the maximum spe2 w qr*sm )s 4h.b)ek) *-vdsfhs0nuiaed it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M suea6(k(hmzf- l(h()y im-/qe 8)f ; ggvhgv lstarts 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 compare for the two trials? Assume the same constant non- zero coefficiegf6se ;g-yem) l( (f-8 m hvqhulv)/i(k h(azgnt of kinetic friction between the incline and the object for both trials.