97.01: A force F directed at an angle of k ,u-hwxeez1z y5uwi4gg. /*a θ above the horizontal is used to pull a cr y -ug,/kwe5ei ghuz. xw*41zaate a distance 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 moving tomi;j4br.w lc. w xide/78y ogo-3ajs/ward her with horizontal speed v. While bringing the ball to rest, her hand moves backym8 io-./4 o .b3ce dsa;gwj7j/rwl ix a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborywje9gpx 1u rfe sn(u s(ep32:;::qmber holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. Duri(9b:wj2nepg:s3srm1(peqe:fy ; xu ung these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizontal f:0a6 cdui:f isurface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this timad06 iicu::f fe.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides wibmy/ rm+ ;3tipth uniform acceleration on a horizontal surface for 5.00 /+tr;mi3pbmys. 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 exerted on a 3.egf7. w8:6or . qepqeo0 kg block for 5.0 s. The block was initiallyq6ge 87o.p eqrwfeo.: 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 right is exertetytp3.wh;k a+jg + )zyd on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surfacehtywzay3k g+ )jt;p. +.
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 throfh5bztf cp( i9 u hwm9..djt,;ws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the student moves off in the oth,u cfhh;.pt.(9m bt 95jfw zider direction. Which of the following correctly describes the above situation?

  03.14: A fan blows tqc:z7; mos9szmg41jiahob- m z i96j 5he air and gives it kinetic energy. An hour after the fan has been turn71sm:gsoh5i;a imj- 6j cqz 9bmo9z4zed off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a .aa gd6)spn ,lblock of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m)g,l 6apdnas ./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 t.jy-7 kh6o qr.dd0snnw rq5o, extbooks is on 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 -y0dn. sko,dorqrh56wj.q 7 n does he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (ab*efq1pfmbc.9z nz:f.n . g 3rxout 32 horsepower) of power to a car's driving wheels. If the car maintains a constane.fnz.q3x.pfz: c * ngm9b1rft 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 bomekx/ 1fd437wy 13j7k jpvzvtx moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the tp47 tj 31yvw7m3/v kxke f1jdzop 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 the bottom e4tybt4jwtmwjv 2+6 k 6fe0t7 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 of F = 240N. The box jm t 6 4t0k264ewwvjy7eftbt+, 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 sbcdk4oe :0t6rtarting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed er 4:okt b6dc0B. When Car B has traveled the same distance F, what is its speed in terms of B?

  12.07: What is the net force actin.vmvz/h g *; 0o qhp-,rlobj-og on the object during the time interval of the acceleration?ho; -hzr v*gq o blojv0m/,.-p

  12.08: Through what distance doesh it* bijxt.43 the object move during the time interval of the accelerattbi. h4ix3 *tjion

  12.19: The magnitude of the linear momentum of a 4.00 kgaoi fz8 vio bk/nwll7u303hkd 6 :lr+2 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 in the kinetic energy oo2:f w 3du 6b+lni38lkkhra07io l/zvf the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy )s*p t3yrzc) wdr2i)ulq.c f7 while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following c ytc)i*w.)7rdcf3u 2 )pq rlszhoices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontaf v ht ,1vuvl/s7rj0m*ft a:: qydb6a5d+ukd7l 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 suittluyvtfd:u:r 0/qvm a*k 7djdbvhs56a ,f1 7+case 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 o(m( /h qx jb3rq:::oc0qrm)ctpy8 nrt f 0.10 w to raim3r:j:/bmqpxh y(: q 0(tort cc)qrn 8se a 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 of the Earth, thef : plvnq( u5p(su,7ft 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 tf ( flnvs(p 5uup:tq,7he Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a height ho above a hard floor an*sysk5o8l 3bn d released. Assuming that the collision with the floor is elastic, which l3*n8soks b 5yone 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. The driver sees a barrier at.*-3lmw zc 6i bs h7-sx*evljhead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net * bm *-j-z.cw3s6lixlet vh7sforce necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down unifor:k u6xkn7 r+qymly until it stops. If the ball travels 15 meters, what was the average net force applied while it was ku +x:r y6kqn7coming to a stop?

  02.26: Consider two la(fvv9ufpo; + qboratory carts of different masses but identical kinetic ev;p +9u ofv(fqnergies and the three 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 vertically inlxr3x qgxe /rz 59.v6ugtr;g* the air with an initial speed of 4.60 m/ zxx r*trg;r3elqvgx. u 96g5/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary con6z k.iv4f0xli,p/ rg3ek s: mrcrete surface. The boy, of mass M, leaves the concrete surface with speed v and hisl 6p,zgs3kevi: f.i km /r0rx4 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 aheightH above the g (m: i/kr ijcd:vxg(4tround. The object crashes into some soft earth and comes to rest by compressing the r:k:ixc(mt( vi4/dgj 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 / mw32m og,itiwdo2p;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 the magnitude of the average net force acting on the mass during the collision with the surface?iw3 p2i/,g;twoo 2dmm

  96.38: A pendulum bo f08 o-t( f h8n9agm-kwhsu+cnb mass mon a cord length L is pulled sideways until the cord mak8fncw +su9 maf0hh ko( -8nt-ges 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. Thxo*f9do p:im( e 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 i(mf:ip x*odo 9s the sled's speed when it returns to its original position at the bottom of the hill?

  06.09: A deliveryman modg) vq c-5itl:ves 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 is the tot5- g)dqcvl:i tal work done by the deliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (2 spgczeqt 8rwjy8-0my,) uv7as shown in the figure) is 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 ovc sjpry,qgeu-y20 tzw7 8)m8nthe box for the motion?

  04.48: Two identical bowling balls A av318. 0 owtupq zlfgi2nd B are each dropped from rest from the top of a tall tower. Ball A is dropped one second before bp8 qiugoz21wv3 . f0tlall 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 upwar8bbq+c*r ( ejqd with an initial non-zero speed v. The object rises to a maximum height H above the launch point. The person ( bc8e*+brjqq 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 strehiszt; 8t j/z66lhan5 tches a spring that has a spring constant of 20 N/m. The potenisztj h6/hnt8 l5;a6z tial energy stored in the spring is:

  97.10: A compressed spring has 16 fhin r:ef)58o J of potential energy. What is the maximum speed it can imr5 oh)iff8e :npart to a 2.0-kg object ?

  

  10.31: An object of mass am0r2wojx z n-u4 3up*M starts from rest at the bottom of a fixed incline of height H. A person decides to puzu3om2n x4rwua-*0j psh 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 coefficient of kinetic friction between the incline and the object for both trials.