97.01: A force F directed at an angle of θ am ed .(xw-rl0nulda :/bove the horizontal is used to pul m:a-wdr. /u 0dnxl(ell a crate a distance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball oi8/if uu:q)3k vyqs0 tf mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the ity/k0q3uu )f8:ivqs horizontal force exerted on the ball by her hand is

  99.14: A construction ljjs q3hg0a/ ;uaborer holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 second0;auq3s/ j ghjs. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block p*l nb fi99 bf:gma.-xslides with 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 time9:-pa binlx*b9mf fg ..
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides with uniform acceleration on a hory:y,b2uy 8v xcizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this t c2uxyy:,8bvy ime.
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 7kr),3ebr;g o m1 ezg-snrap93.0 kg block for 5.0 s. The block wasear3s - 1pz7,rbrgg;em no k)9 initially 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 force directed to the rigo)kjue 5uz ;h.ht is exerted on a 3.0 kg block for 5.0 s. The block was initialk).5ohje; u uzly 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 h-o)pfle 3hib) ammer 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 ))fop eb-lih3 correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic en)*.aoss-e g plergy. An hour after the fan has been ga )*slso.-epturned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mhqz5 (aj zyw-(uao1 :uass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s,-qy1ujzaou(a :zw(5 h and an 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 the middle shelf in the bookroom 1.3 qn02y b6vje/z ggu; ,gt)p 1jam 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 doajpzy ,b0ggvj ;)6qt/ 21gun e on the box. The box has a mass of 10.0 kg.

  02.32: An automobile eng6mz/,h.p xdmw8fce0 cine delivers 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speew./zfme hcm x ,8c6dp0d 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 witaj83jv0 x jkxip * yzadl-vy,,,)f 8soh 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/swhen it rdfpxy3jaz8x j8,v,kysa *ijo0v,)l- eaches 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 thgsrnbl . p 7(f).a.dkme right, a box moves with speed 5.00 m/s at the bottom d )bk r(7pngals ...fmof 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/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 from rest, gwc*8atth5c2usvcf l7w+03 salong a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has s2c8 c 7s*c5t slt+0a fvhwg3uwpeed 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 the o.jt)(c o3zd2fphp5lz : a ddt;bject during the time interval of thez (. cadd)ztj:hfo p2;ltd5p3 acceleration?

  12.08: Through what distance does the object move during the time interval of th 1y2z ngo vv+q)esj)w+e acgnv yjq)s+o)w+ze 21v celeration

  12.19: The magnitude of the linearfp64okrk wan+- lim8, momentum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What ip afk8kwi+-4m,lo n r6s the change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic ener,zr,tw yjl5. kgy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represwt,ry ,jzlk5.ents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull nts+va)r*g0wkgz, 8oa heavy suitcase of weight mga distance d along a level floor at constant velociksa,vw 8t gr)oz*n0 g+ty. 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 an5q hc:f1m0odf :0fdc s9sg8 at upward force and delivers a useful power output of 0.10 w to raise s 90af f5 t80csmq1hgdf::ocda block vertically 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 ounok3/1 i l51a,t allahov:m/f the Earth, the gravitational force acting on the 1.00 k ltivl uhl/amno:3a,o1k 51/ag 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 motionless a height ho above a hard flnwzjrd.9ed* .wxh:fd-7 wk6qm ou4r8 oor 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 odww-rxu 4 mwn* . z:do.fr7j 8k96hdqef the ball and its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The drivermp7,2f: efac8*vsilw sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnsw c ef87f*lmpiav,:2itude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows d5;8dzl-+ rpblrzn;tx; i dx-qa8c b)kown uniformly until it stops. If the ball travels 15 m;z 8lnxrqpkl;-bb5ar+)x8tc d;d zi- eters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses :*rmoe a rd/hpi.g4 )ubut identical kinetic energies and the three fol4r)i dpeho:u gm.r */alowing 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 of0(lh nlkhjjp0;8 zc 4p clay is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring hl l8p z0kjc 4j0p;h(nair resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straigh 6 orm*w3stg;u+q(htst upward 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 the highest point of the motion. How much physical work did the average( w; 6hqts+o mur*gts3 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 aheightH above the g 6w9xd-admi,uzaj r84 round. The object crashes into some soft eart w6amj8uxa-id ,r9d4z h 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 the ground. The knj7nu+1()*z2oe7muv d 2ut pzt,wqvobject bounces off of a horizontal surface in a collision lasting time T. The object the,unuk*nz) uj zewvtv77+tom p2(2 1qd n 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 p iwi8f.qci4aaoewpy6 2 :) *rnulled sideways until the cord ma:)ya6i.irn iaqwp4f*8 woc2e kes 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 uniform incline of unknown angle. Thzf:pco* jx7vo4/*qo0 0ntzu he sled, 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 opo/z*jx0uhct:z4o vn* 7qf0sled'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, a3ktvxdp11lzp ako2 2k t2h,y mi 89xe5long a 10-meter ramp to a loading dock, which is 1.5 mete9 2la1tkhoyvxm 2kd,k ep t58zx2pi31rs 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) is applied forkhioo;c(3h,q9s afjn3 9) gtr the 6.0 meter motion of the box upward along the incline. The mass of the block is M=1 g hc99i3fkj(osaqr o),t3n; h5 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 from rest fromx8zu7 im5 8h(mmaz *rq the top of a tall tower. Ball A is dropped one second before ball B. After ball B is dropped but before ball A strikes th8mr5a(qz 7*ximmhu8z e ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straigh w+5.7h dfqcxyt 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 with initial speed 2v. In terms of H, to what maximum5 wq7fxh+ d.cy 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 tht xc((w q55nn2 2wmomqat has a spring constant of 20 N/m. The potential energy (wo( nmmq52wcx 25tnqstored in the spring is:

  97.10: A compressed spring hakks6emd/ zw9, s 16 J of potential energy. What is the maximum speed it can impart to a 2.0-kg object m, k/ d9we6ksz?

  

  10.31: An object of mass M starts from rest at the bottom of a+a o /,bezegul,6 ivrjwft :;-zgb0y/ fixed incline of height H. A person decides to push thefg/jigua b 6z /-we,0vozb+y,tle:; r 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 coefficient of kinetic friction between the incline and the object for both trials.