97.01: A force F directed atpt1+q er. mt,nvz:vz i1-b-p-wsz1tl an angle of θ above the horizontal is used to pull a crate a d-.+1ipn:mb z, wstqv-z 1ttlr1 -vepzistance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is movir t49eyjx+pa* ng toward her with horizontal spet rxe* 4py9ja+ed 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 uq9rb v+hn c) *9o2pemlaborer holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. Durinu*pbhrov mc 99n+2eq )g these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acvkbyk+e,* t0 7x,7n:opxfl rxceleration 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 timflvret xk:x,*oxbn 7p7y +0,ke.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block uz d+i 4um*n2kslides with uniform acceleration on a horizontal surface for 5d + znu*kmiu42.00 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 foae,c0zkg*- w1j.um uuzrt)5orce directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at e)-5wr.1uc uz, o tumkgj0a*z 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 right is exerted on a 3.0 kg bloc-k o5rh,4odcv +(j8jo fzi:l rk for 5.0 s. Th+- rh4jo8: rkoj 5ldozvf,(cie 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 frictionle2o2k.num lzu(ri74u ess frozen pond 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 describes the aboveek(r2zuo7n l24umi . u situation?

  03.14: A fan blows the air and gives it cr:dfb1 * bfxbywa-8*zl4 9 fskinetic energy. An hour after the fan has been turb8 bdbf c-4fwy1*rl:ax9 zs* fned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has a position.; 8b+tvl5ig szvhr.mj/z6au of 3.0 m, a speed of 4.0 m;v+ izr6/gmtlz .vh aus5j b.8/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 o2 ruqqy/p(v ndao o/(6n 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 hado ayr((/6/vnqoq2p us a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (aw2w1w6 wt40rf3hohgc bout 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65 h6twc0 32 ww1f 4wohrgmph), 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 at the bodpoe8d.kag7f75e 4o mttom of a rough, fixed inclined plane. The box slides with constant akf 7 8omed7o5 .deg4apcceleration 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 5.00 m/s at,nb (+ta)g jcf the bottom of a rough, fixed inclined plane. The box slides with constant acceleract jfabg,( )+ntion 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 starti7m ck6 xghx;/ing from rest, along a straight road. CarA has twig ;mk i6xc/xh7ce 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 during the time i q wbsm655v2a/bad0wgnterval of the amdg 5wa2 wq/50sbb6vacceleration?

  12.08: Through what distance does the o28ivv76 -pqa0js yy82 t rgqqtbject move during the time interval of the ac 72avsj620tt-qqvyr i y8gpq8 celeration

  12.19: The magnitude of the l,zjv-hm ag-3iinear momentum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in -avzg,mhj 3i-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 from xo-uqjt7eu r2; 1-otf2.00m/s to 4.00m/s. Which ono7tjfr e u;1-x-2quto e of the following choices best represents the mass of the crate

  94.38: A force F at an ang52 u 3b ckev/jjjm:9dwle θ above the horizontal 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 suitcasmjewv3j2b/ k d9:c5uje is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force and delivers a useful power o; ,al5 )ozmn1s dwcz2dnh f/et53pj*eutput of 0.10 w to raise a block vertically at a constant speed. At what constaw1ja c *;5,m pznef/3ddthslo)e5n2znt 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 Eart0z wt lt326mpjw*hxc 3q7;l sqh, 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 by the gravitational force acting on the Earth by the 1.00 kg object during p7032q*sw jtlz 6 3xtmlqwh;cthe fall?

  96.18: A rubber ball iminu3ulh lsdy0e n.kyd8u2x;;*d1q 3abd 6 t2 s held motionless a height 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 energy E of the ball and its heighl btqnk3a1 u8d d2u;;0hl i3e2x6.md*yn sdyut h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver se7hsha5( 3t;bmgr1z htes a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force nechtr bh7t13 hgsmaz( 5;essary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformx.j;2aeeq,7kg h3ept ly until it stops. If the ball travels 15 meters, what was the average net force applied while it w ;egk qjax7 te.pe,32has coming to a stop?

  02.26: Consider two laboratory carts of dlbm82ez89m c/h 4mwk jifferent masses but identical kinetic energies and the three following statements. kw8mcjel 49b/2m8hm z 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 claug2l6t :+d9qcag( mdl9 h4r cgy is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest poinm c9l6:+td gqhugc 2 9r4g(ldat?

  06.20: A boy jumps from rest straight upward from a flat, statc ;6pkyym, 1baionary 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 normal force of contact (N) between the boy’ s feet and the co ma;1k6yc,y bpncrete do on the boy?

  02.48: An object of mass M is dropped from aheigg+;7(vvl 0 y p0xdku c+eyq8juhtH above the ground. The object crashes into some soft earth and comes to rest by cok+08(c7gv v pqeu0j; +udyx lympressing 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 u0yi cv*2+sx8v cod9ithe 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/8 u2soyd xc+ i*0cv9iv2. 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 pulledpdyu9hdx 5z:(og7n w2 sideways until the cord makes an a:w n(z52d d7oxuyhpg9ngle
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 unknyn a 3(tjdh1 :po-wr3aown 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:tny1warh(d -jo3 3pa 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 r 2vlx+ap7jd 6) ge64+o yervuramp 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 them67rjo agpe v 6vd2l4euyrx++) to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is ap :ei ybzz/t) rq;.zkz7plied 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 rkie y./t);bzq:z7rzz epresents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A anl)4bqnrslp f,t *qqt u6x+q *.d B are each dropped from rest from the top of a tall tower. Ball A is d) *l6sq+lq 4 *qfx tu,r.bnqptropped 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 throws an object of mass M straight upward with u et98up ycm*px8ai9)i/c eq: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 )ppuue8eiya9*/xt :c9ic q8m 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 stretch .cq:s3oj,wtkf3w g2fes a spring that has a spring constant of 20 N/m. The pofgs ft :2j w.,ok3qc3wtential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potentizj 1 y(any*c,zal energy. What is the maximum spez1(jz*,cyn yaed it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the-5fli5.iiirdpco9 (f 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 coefficcdp r(i f-5lf5i.oii9ient of kinetic friction between the incline and the object for both trials.