97.01: A force F directed at an angle of θ above the horizontal is used top/j(0miblbd4m-b(60ox re1 s0 f olco pull a crate a distance D across a level floor0xl 0f(b mbm6cd/ojl - irp1eoso 40(b. The work done by the force F is

  97.33: A softball player catches a ball of mass m, whvssjt-y, /;wca 2yk,cich is moving toward her wic;,cks-, vayysjt2/wth horizontal speed 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 sheet of wal e15.fypssee7 lboard 3 meter above the floor for 4 seconds. During 1 y75e.p fsseethese 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with5,-fe jq wyrap-0qp:a uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 ,p:jawy0a-qpq -5e rfJ 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 slid2sjhj237( dop 5kzya des with uniform acceleration on a horizontal surface f o 2 pka73d2jjshd5z(yor 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 riqqkcp;gu)ie5 *a s3 k*7h/ vyhght is exerted on a 3.0 kg block for 5.0 s. The block was initially a ep5q7 v*k/ciusa3;q *)hgkyht 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 t;xd//zso0 hl yhe right is exerted on a 3.0 kg block for 5.0 s. The block was initially a0 /lxyo hsz/;dt 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,:g +uoj fj*qkammer 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 cf:*oku g+j j,qorrectly describes the above situation?

  03.14: A fan blows the air and gives it kinew0h tcndfwtw*z 4coe4)7*m tu x;,i6otic energy. An hour after the fan has bewf04hw6c iz *o et; xtd 4nto,um)w*c7en turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mas mf/vtpnop 77*cy 5(tzs 0.50 kg has a position of 3.0 m, a speed of 4.0 m/57(ppyzf t*nvc t om7/s, 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 th6g;av0ion,lg xv mcg)8y. 2hu e 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 has a mass of vyh 8g 0x ;clm.va2)o ,6nuigg10.0 kg.

  02.32: An automobile engine delivers 24,000 wattgj1wpe;,as+d.5z bf g s (about 32 horsepower) of power to a car'sg, wgj 1 bpf5a;+.dsez driving wheels. If the car maintains a constant 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 move4 fwut,mqn zw-n).p a 5ex;*lgs with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides withzauft*, wq;nep. g4m x5)-lwn 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 m q15cv+mo/gb . uq3mfmoves with speed 5.00 m/s at the bottom cqm v/gm+f q o3ub1m.5of 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 trave0mf s*hy0;ujiqmts-5 - dkgk0oaqg (6 l to the right, each starting from rest, along a straight road. CarA h-q( y5h60;aismf00 ogqm-gkjtku sd *as 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 net force acting on the object duzj w) w2lgk j2n-e;x)nring the time interval of thexnnwke )jz);lg2j- 2 w acceleration?

  12.08: Through what distance does the object move during the time interval of t5;g7-ajdwy2nq i )ibl he acce 5)7iawqi;jy d2- nbglleration

  12.19: The magnitude of the linear momentum o)jp4xf2c,f4 arjwxj- lyl e; izp1x (1f 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 is the change 1 axp, yxjfij-x fcep;4wrl)4z j2( l1in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its spe 48xh4l 8qm1kfd ggm5eed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents m e85qg1fd x gm8l4hk4the mass of the crate

  94.38: A force F at an angle θ above thjl1wy c3i+i/t e horizontal is used to pull a heavy sui wl1ti/+ ji3cytcase 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 force is:

  14.31: A toy crane exerts an upward force and delivers a useful power output ) 8.dt0ct 7)g,dikegcl4rb-jc- enm a of 0.10 w to raise a block vertically at a constant speed. At wha- 0c)7dkd i-8g.r,etlgbec n jtc 4m)at 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 p*+,f0gb0kbwh g (+u gvq ah:aof 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+ kg(,quw*hahb0 f +b:v0pgag 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 hr2:c nvux ym4)olo38 p wzlr:,o 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 ener38oxy: )uw2nr:l4om zrc ,vplgy E of the ball and its height h above the surface?

  07.06: A 500-kg car is moving ml:-sd f fjlf6o9n5kvbo,;)b at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come d :5v)bfs6,;fkoobj9-fn mll to rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15) jvq3 3m6x54 pe (sujjsvfer9 m/s slows down uniformly until it stops. If the ball trav(vsef35j4 erj6 js)3 mv u9qpxels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory csyf.8 0mo r-mgarts of different masses but identical kinetic energies and the three8-mmofy .0rs g 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 v5-biq gt42a gqi,bun9 ertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the chq4tn2,gq95a i u ig-bbange in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight u +l21o7* onrd2mk -5vvuvv ucdpward 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 hvlu*7v o2rm5nv1d cd vk-2+ou ighest 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 fromntz72xji fmye+qc ,b 7-t,b *p*n6jrf 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 negligibl , y bjt7jf, nfnq-b*x2*pc+itemr z67e, 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 ohld07p z.33d ujm- k.pe nyf ;lz1u1kkbject 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 m.ku -hk 1jke370yuf.zl3ndpd lpzm;1agnitude 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 pulled i e9ar:0alye 3sideways until the cord9e:a e0yla3 ri makes 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 uniforslz8s;a ;n d:(.auhy wm incline of unknown angle. The 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 sled's speed when it returns to its original position at the bottom of the hill?8w;; ahzlsnyda(su.:

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a lqlq6j f/nq6 roqtn/t3l )1f (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 is l/ o nrqj3q)ln(f1fl6qqt6/tthe total work done by the deliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=f8 m;2wpt3i va50N (as shown in the figure) is applied for the 6.0 meter motion of the box upward along tmi2w;vfp8a 3t he 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 ad 4ac,0yt.: rmwuufg9 r h,(dmnd B are each dropped from rest from the top of a tall tower. Ball A is dropped one second bef.rw u9,( mu,a: dcgr0hm4dytfore 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 strakuo uk91(swcr7vd /4g ight 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 maximum heiusuvrkc17 9/w4g(od kght 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/m.t,n/ietm) vrd dp(chnje8 2 wkw);, +t The potential energy j2ihr wt (dt8/)pd n,tnmcv ),weke+;stored in the spring is:

  97.10: A compressed spring has 16 J of potential e totp)-.do5u anergy. What is the maximum speed it can impart tot5u-d o.tpoa) a 2.0-kg object ?

  

  10.31: An object of mass M starts ft,k g*y,.y xdirom 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 coefy ., d*gxyt,kificient of kinetic friction between the incline and the object for both trials.