97.01: A force F directed at at *:rvk6aamd6n angle of θ above the horizontal is used to pull a crate a distance D across a level floor. The work done by tdt 6mav6*a:rk he force F is

  97.33: A softball player catches a ball of mass m, which is moving toward her sgci /6s v9qu s*pk;z;(d6sit with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced9(/susi;;vsqds 6piz *g6kt c. 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 wallboard 3tx.dsxd9/+z oz 2jpb2 meter above the floor for 4 seconds. During these 4 seco2 ddx jtz+ 9/.xo2pbszndshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides wi(f x4n.5 tpgmvth uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this n.p45fgmxt( vtime.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides with x2qsoo z8knk+,rx:) o uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to28kx onk z,so) q:rxo+ 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 exerte a.tou-ef.pl dsp)5q; d on a 3.0 kg block for 5.0 s. The block was init5s.aqdf e uo.tl)-pp; ially at rest and slides 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 fozn dk vfj:.ap/b9 hlwl(kt16ach+;phi+, la- rce directed to the right is exerted on a 3.0 kg block for 5.0 s. 9 ;.:falbnhhd waz/+(t,hl+ ikvj- ckp l1a6pThe 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 pf,sx0f: 7otyb ond 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 following correctly descri,7s:oyf ftx b0bes the above situation?

  03.14: A fan blows the air and givesnly9 tbpy7p5j. 3q-xr btai7 1 it kinetic energy. An hour after the fan has been turned off, ypa5.l 7qxbjy-ti1b 3n7p t9 r
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.8+e, mfxivi v+rbr: fsszk;2850 kg has a position of 3.0 m, a speed of 4.0 m/s, and an acceler, xmev zivb+f2 ;rs fisk8+8:ration 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 the bookro( abaqp:ehlhfst3 28*om 1.3 m from the floor. If the janitor relocates the box to8fepa3hb a*tsl:2hq ( 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 delivers 24,000 watts (about 32 horsepower) ob*,-qw ns -(gb.moxgh f power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65 mph), what isqbo mw.-*( x ngs-bgh, the magnitude of the retarding force acting on the car?

  09.13: In the figure to 24ruhfe6 1 (mmkftsgz y t6y/g, : ;ck5pipe,mthe right, a box moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleratios refgh; myt2kt 5p1i(p6gu efykmc /:4m6 ,,zn 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 speed 5/;fzz t( btvf/.b6g c.mxv 63etbv iw;.00 m/s at the bottom of a rough, fixed i6;6bvbwb(/ . 3ezz ttvgxi cfvt/f.; mnclined 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/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 w2-,e o nxc )h-or0foeright, each starting from rest, along a straight road. CarA,-ooo0c) rwx-e fhe 2n 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 terms of B?

  12.07: What is the np(e:twyppry4 rj 24dy/j+t b 3el/jmj +gxt ()et force acting on the object during the time interval of the accelerati e/2t3(jrl+:r)4gytj4/e( xmytwjpbdj+yp p on?

  12.08: Through what distance does thr hx9v 879qx l+bhv8see object move during the time interval of the accelerae9ls 8xr8+hh 9bx7vqvtion

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is chan,p0-jab8 hifhwl ; 4 se- ezx*1ajiei4ged from 6.00kg.m/s to 14.0kg.m/s-1e; sbii0xfhee8zjjp4h 4a al,w- *i 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 kinetic energy while its speed is increased fb0+y+b;g r pz g hx)oer.vq8b,rom 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of,)ry.r g+8 ;zpbgx0 beoq+vb h the crate

  94.38: A force F at an angle θ above the horizontal i+ waji .x.,*ppg rnd-k,u7 sdbs 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 supr. j+b*x,n g k,dw7i-ua sp.ditcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force and delivers a useful pow w34 nu:rl*fcak/ x,qcx6zkj/er output of 0.10 w to raise a block vertically at a constant speedxnr*l x cj//ak:3w6zkc fqu,4 . At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest kurv. n( 4zxjeex3(70ua) g) (o ekclynear the surface of the Earth, the gravitational force acting on the 1.00 kg object by the Earth does 10.0 J of work o(n yk)uxo( j 0z.(lkar3 4ge7e vux)cen 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 motionless a heigh3 l ;utfwzub+4*jpzh3t ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relationship between the total en* lzf3b uuj t;h+pwz34ergy 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 fq8/ vpj/yc*rwj k*5ssees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force necessarywjk/5 qvj p8 ycs*f*r/ to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it sty* g gxfh3zl9*ops. If the ball travels 15 meterl3 zh9g **fxygs, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of differenov 4: fkosh.p5t masses but identical kinetic energies and the three following okp :5o.sh f4vstatements. 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 tossed877im3pm q2vy ) ggsj+oav3db vertically in the air with an initial speed of 4.60 m/s. Ignorin3diqb)a8g p7vm2g7 oj y3v+sm g air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight 8 nfp)9duyxc (upward from a flat, stationary concrete surface. The boy, ofpdu 8y( nx9)fc 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 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 aheightHx )9n ku5bb4m y5eqm2l above the ground. The object crashes int4)ye 2nkbl 5q9 mumx5bo 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 /u609hxbiw bkthe ground. The object bounces off of a horizontal surface in a collision lai buh60wkb9 /xsting 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 boo+iih14*gpspdag20 n c opj/9b mass mon a cord length L is pulled sideways until the cord m20pgp9a ojhon p+/c s4idig1* akes an 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 uxgf; ov1r8eq ,5 2gubgniform incline of unknown angle. The sled, which started at the r oggfg25,uqeb8x1 v; 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 of the hill?

  06.09: A deliveryman sph(guck6( 4qb3 6d gl0xv9ckmoves 10 cartons from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a mass of 25 kg, what cggx0k6kl9(u 63 hbqc(dvs4 p 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 fig94zl8ta3mp0 b1 wnd crure) is applied for the 6.0 meter motion of the box tmw90pdbl r14 n3z8acupward 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 n/w )3s t1kzr zr24l+c8 exkzt8v/dpbfrom rest from the top of a tall tower. Ball A is dropped one second before ball B. After w cl sr+pk1)84v/8db/ ezt kzxn32rztball 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 straight upward with an initial nonhb -+39 asgc mjwvr2n1-zero speed v. The object rises to a maximum heiga vw31hbcs jgr n9+2m-ht 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 / ,pqe1qbi ikv/ jiv2 ok4nno8-eu i*.N/m. The potential energy stored in the sprin,/qnoi- 4 2k 81e vpb.eu/ivoinij*kqg is:

  97.10: A compressed spring has 16 J of potential energy. What ibjf,wpt6/fs21. t56dwutpaehl( : r fs the maximum speed it can impart alwjb5 e61uttp,t(f/wsrf :.f26phd to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixe zkvy-7 q0p9yl,tx ihctb/ f++d 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 rea9v7y++f kcy iht ,-/0qxtpbzlches 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.