97.01: A force F directed at an angle of θ above the horizontal is used tor5xa953iv-bdwp2z ya,xbl j .bvl 3/v pull a crate a distance D r vb2xlb 5-bdy/5 9ax lip,jv3aw3.vzacross a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which nz4q+v*i , 6s ;;j zyx0jh,wh*uqarfy is moving toward her with horizontal speed v. While bringing the ball to rest, her hand movexs0 q *hyzy *,ihfvwn6j,uq4;+zarj;s 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 wallboard 3 meterlqk :niu (hngh)k.-6 w above the floor for 4 seconds. During tq kh )w.ihn6ln:kg(-u hese 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a hor vrg 7o1seb-l.sl-r;*mj fskjp s,:- kizontal surface for 5.00 s. The block’s kinetic energy m:kgkv-r1f;s b-l . ep jos,7j lrs*-sstrictly decreases from 50.0 J 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 slides with uniform acceleration on a hor3 mi .idym;(r+mmryl0erf45,d ,o f lbizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 Jfmb;y40imld o5m.ef ( ir,,r3+rml dy 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 rig; )w s28wfdrijb 6t:*i,j vdefht is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal srfb;j68*: iet wsd i d),fw2vjurface.
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 ri z,3m siy /be,rox)yj,ght is exerted on a 3.0 kg block for 5.0 s. Thb,iexzy3, r , jsmo/)ye 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 frictionless frozen pond throws a 1 kg wz/ie0z3 aihou*f,4hw xqi .+hammer in one direction. Ahquox hi3iz0,*.+e/wfz 4 ia wfter 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 above situation?

  03.14: A fan blows the air and givu w2r5p;4ie j4q6a 1mutnsf;wes it kinetic energy. An hour after the fan has been turned off, w4n ;2u4m65wpsq; u tef ja1ri
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg h clg w+2-,lwzx1c*p kvas a position of 3.0 m, a speed of 4.0 m/s, and anlcx ,wg k*-z2wvc+p1l 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 ew,8 7tdm9ftxb2 zjt(1.3 m from the floor. If the janitor relocates the box to the shelf thatdj 2xtemtb9 fw7(t8,z is 2.6 m from the floor, how much work does he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (abour(o6m t/kf7v0ykq6 tu t 32 horsepower) of power to a car's /(0tquyfk6v6kr mto7 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 th f:xam7 *5s oplv.yf,sij4me2 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 consif:7lp mxmy5oa fj v,s*.2 4estant 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 right23 e(e f:ts:e bcdcm ;kdbg1a9, a box moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant accelerae9 2:1( 3gbes;cdtm:ed ka cbftion 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 sta2 fuet9t-foc+ u 9aaa0m7det1 rting from rest, along a straight road. CarA +acua7 2ottt1aed u90f9ef-mhas 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 fe8ax yi0,) nsqorce acting on the object during the time interval of the acyix0 8asnqe ,)celeration?

  12.08: Through what u y*k2zxj2 j6:tzcgp(distance does the object move during the time interval of the acuzj:(y2j z6xcp k2gt *celeration

  12.19: The magnitude of the linear momentum of a 4.00 kg p o1enchn+n/bxeuo+(3i:n q m.oint 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 of the e.(+hnocb+mq u/ixnn13 :noemass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energyg idu 7d0 8q:k7vsq-cj while its speed is increased from 2.00m/s to 4.0c 8g: 70 q7di-dquvkjs0m/s. Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used tob j/ - 7srgbyx24,wjzscisi7 , pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the flozj2, s7i,c r4-w syj ig/7bsbxor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane oxvr8+xtv9 84wgv/er9u+ em sexerts an upward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant spm+9v eru vsr 48vxoe8gxwt 9/+eed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is rel fv0+ zxongo+u 9d+d2+ fzmjy)eased from rest 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 choices best represents the amount of work done yfxz+g)+ dd0 9zo jnfu ++ovm2by 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 floor and rel 1u*z5tsbppo* eased. Assuming that the collision with the floor is elastic, which one of theto*us z5 bp*1p 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 r6ni 1cypwc,v go(: p728 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest(,w1pcv c7oyi rnpg 6:, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly uav/sym2tcw y f*61 asg70hd*mntil it stops. If the ball travels 15 meters, what was the average net force applied whilea*s acm 6ym71t*wdgy hf20/ vs it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kinetic ews,a vcdk8.5lj lv.2*ravr8q ck8 vd.sarrva2.vqj 5,8wll*nergies 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 oft89x-: x1 mh3tsax:uo)odz efy3dw 9g clay is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in wg9u1 oyh ma8xftt :d-d9)eo3:sxx3z its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, kp7lcd.r 9pe 5.n .ta m-sho,estationary 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) sdt. p. ra 7 n,pk9lh-.mocee5between the boy’ s feet and the concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH abu r.y6u2-n0aob9fsr +yy5 s dvove 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 negligible, what is the magnitude of the average constant force exerted by the ground on the o yf6r -0.s 29by+rvu5uoya sndbject while coming to rest?

  12.48: An object of mass M is dropped from aheight H above the ground. Thf3c,7(4c*x4mudvqp/hc cro be object bounces off of a h7*( cc3fhdccvbou/, xp4 r4m qorizontal 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 lengthh 20o)emt 6eslmn o y477xtoq3 L is pulled sideways until the cord makes 62ohx ye7 tsten)qmo347o m0lan 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 e z.*ltu11ip rxu5b1e drm (0uuniform 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 ituipu11 b mr1e (tzudel 50x.*rs 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 xf9f8ur 2 yy ez1s1/xlthe 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 total work done by the deliveryman on the cartons to move them 1fy8u/ r1x2zslxy e 9fto the loading dock?

  12.16: A constant fo,b xe fm59 6vuh9opmaz29yvfg 8y. h4trce F=50N (as 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 besh56vf9b zm 9a,ty.4uyv9x fp2mo 8ghe t represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each d f,) 8zhl-zoo)+qfxznropped from rest from 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 the ground, how ar)zf8hzoo fx-z n)q +l,e the mechanical energies of the two balls changing?

  11.28: A person throws an obh q38q x; eq2(w0,eki9k ,/d1doervyo w7sxayject of mass M straight 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,1y deqw3 exd,/wa9kx y720;( io8k,qshvrqeo 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 constant of 20 Na;n.l fz8z hu 8owml-3nejf/ ;/m. The potentialn;aul wj8 .f83nome-zfz; l/h energy stored in the spring is:

  97.10: A compressed splq+ 2wn2n/vi wring has 16 J of potential energy. What is the maximum speed it can imparilv+/w2q w2nnt to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incline r7hgwv5kb5 ,b 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 coefficient of kinetic friction betwe5 wvghb bk7r,5en the incline and the object for both trials.