97.01: A force F directed at an angle of θ above the horizontal 25z ktlr0( kncpx(zuq 6a,v7i is used to pull a crate a distance D across a l2k 6u7v0kz ,r qp al(cti(zn5xevel floor. The work done by the force F is

  97.33: A softball player catches a ball of w:lm6wbj:ab)8xn ds) 7f:o nzmass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a d n )bfl nwz:6ao7jb :xms)d:w8istanced. 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 wallboar4axiwdiffd-4 eje:3)7ofg m0 d 3 meter above the floor for 4 seconds. During these 4 secondshow much power w)xe3d m4a d:jgeif7i-0 wo4ffas expended on the wallboard?

  17.11: A 5.00 kg block slides with udfyfw s/)) f.1n5xyoqniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J iofy/x.dff5nwq1 sy ))n this time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg bl)3b;uzd 4/ltlw -wem lock slides 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 thisub l4)z/3;-et wdw lml 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 3.0 kg blob0h:ocvi0sd7* ,0 yk/lyhyl; l0: m mdiwya9i ck for 5.0 s. The block was initially at rest and slides on a horizonta/ kov*0cmly7lmd hy0aiiw syyl ;:d,0h:9 0bil surface.
What is the speed of the block at the end of the 5.0 interval?

  16.12: A 12.0 N net force js6ifrfk(:l-4w p9 4 ;h:ixvznuxen6 directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially 9i s4:ni(vzuf46j hx6p l;:frk-wexnat 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 thr/, (.n qfoozqyows a 1 kg hammer in one direction. After the throw, the hammer moves off in oneqoq.(f ,on/z y direction while the student moves off in the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air aniwi:izf kb qnvx 9 gqn22ivm17v-oed5 778 (oud gives it kinetic energy. An hour after the fan has v:2z1nn5ib q eqmiow o8 g79vk(v-2ix f7id7 ubeen turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of m+af1s/ ;yup.jy :b1 qdm6s 8gs-ibgeuass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an accele :-j6sby s eu/8q;mgfiga+b. spd1 u1yration 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 m fvo s/ i78i ai.l8mi(ica r8;1hwck +urgvj17 from the floor. If the janitor relocates the box to the shelf that is 2.6 m from the floor, how much work d/ro8gi+7 8;i(iimhvac uk 1c7lis1v.ajwf 8 roes 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) of powef s(hbx(:hg q;/0pr x ;mfkja9r to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65 mph), what is the magnit ( mfqr(fpax;g9k/sxh ; h0b:jude of the retarding force acting on the car?

  09.13: In the figure to the right, a box moves with speed 5.0oz t -;03pnho,tq (iya0 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/soaot3h;tqpz0 -y( n,i when 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 th+ehx9 1*tz i8ui 95yifl,g+xmtjhz m:e right, a box moves with 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 of F = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the top of thefz:tii gj91m+t,mzi+ h9hxyxl* u5 8 e 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, along a straightu/r,8i3o4*kpkwd h o w road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car B haw/8o pir4ku,*hok3dw s traveled the same distance F, what is its speed in terms of B?

  12.07: What is the n0k8hl*4ms(o myh 9jhfim75l uet force acting on the object during the time interval of the acceleratio s7fl(u9* 0m4lihhky5hoj8mm n?

  12.08: Through what distance does the object move during the tz6 yubn9g3a- u,u ;gszjqeur4)3 (ctlime interval of the acceleratioe9l) ta-u(urzjnz,33gs gb;6uucyq 4 n

  12.19: The magnitude of the linear momentumw28nzr,78 mah jal50e -x-z ly cop)+cria8cn of a 4.00 kg point mass is changed from 6.00kg.m/s to l5li8+r p )roazx-c80 zm y8wacj-7n hc2an,e14.0kg.m/s 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(*k h /jqwv6 0wjboz7c J of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which on0w 7o/ q6jbzwv(hcjk*e of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is usedw 0z xpg x7f,8hzt(k2d 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 tzf0ghkx 78x pd tw,z(2he suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts u +vn q:drf/b7luot 78an upward force and delivers a useful power output of 0.10 w to raise a block vertically aturv8utf+/ qb d7n ol:7 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 rvf .,q.lrxp+3pueo2en ek*n+ e tc,;jest near the surface of 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 choi r ,ek;p+nqe etp, *c2o .3ef+.ujlvnxces 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 (6(e13pzhnhbbtlw adm ,r /;efloor and released. Assuming that the collision with the floor is elastic, which one of the follobhtreh d3za6(wmlen,b ;/( 1pwing 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 .,rfwa :2yfyy driver sees a barrier ahead. If the car takes 95 meters to come to ry .yf2aw :yf,rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15r/ a suzfscq 9otc(.50 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was coming to a s9 /rcc.su5zf0ts(oaq top?

  02.26: Consider two laboratory carts of different masses but ideawzm-5r .odap e8x l*bjh39d i: .0vqhntical kinetic energies and the three following statements. Which of the above statements- 0*rwdb d9ai3.qhzl ajeohxpm 58.:v 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 in the air with an ini09cjc)m*k iz7p+twmmt, ) evttial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its j*wc)9zp mmitm0v 7cte+t),khighest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary cotl:5hg54z uyi ncrete 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 c5:4zhut5i lg yoncrete do on the boy?

  02.48: An object of mass M is droppu t 9g5hsr-viqs9,cpy d.4 gq-ed from aheightH above the ground. The object crashes ih54vq-g,g -s.9prcsi9 ytuqdnto 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 the)vu3 m im9.uzn ground. The object bou9 3mvuzm.) niunces 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?

  96.38: A pendulum bob mass mon a cord length L is pulled sideways until the cornsl(d*,qvk,/drxbh. x gfm ,0n j45fnd makes an angle x(.m4v 5rfnn0*/b, gs ,khjf lnq ,dxd
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 ofhw bz3,9g.y,+by mv gw unknown angle. The sled, which started at the bottom of the incline moving at 10.0 mwby z3y9b,gmg+,hv . w/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 moves 10 cartons from the sidewalk, alon 82 yx7mxo5m6i uif(s;p;g sdhg 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 total work done by theoxisy 5(8xfp6ui7 ;mdh ;g s2m deliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (a7 mfs48o tt0cas shown in the figure) is applied for the 6.0 meter motion of the box upward along the incline. The mass mfoct87 s4at0 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 from restph, 8m +aecr4rg26qkm from the top of a tall tower. Ball A is dropped one second before ball B. After ball B is drmm r 8qh,g a2ep+r64ckopped 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 straef0+jx ,ph -z7wzqmp *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 o,fepw7-qz+ p0h*m jxz f 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 const)+;yxms/ tbolj (ylf ;ant of 20 N/m. The potential energy stored in the s+mj;yll f/(xb); tos ypring is:

  97.10: A compressed spring has 15*jai1187bscoqhuzh -f+/ym rzn 7 k n6 J of potential energy. What is the maximum speed it can impart to f*ynb r7qs8k-1oh 7i c1hu j+/m5zznaa 2.0-kg object ?

  

  10.31: An object of mass M starts from restx;+x9)jdo3 oh qo(au e 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 to3)(x qjoho9 u+ax;ed he 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.