97.01: A force F directedt 8pu ,jvh+hyj +x.k+ knxv,7x at an angle of θ above the horizontal is used to pull a crate a distance D across a level floor. The work done pvu x+,k7 8nt,.jk+jx xh+yv hby the force F is

  97.33: A softball player cazmzc 7cnq8385tjgof 6tches a ball of mass m, which is moving toward her with 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 icojm z 88n5fz763qgct s

  99.14: A construction laborer holds ape g 0;lj j012scz1ypxz muj(; 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power2pz 1j e; lg;zj(0ujs1 pycxm0 was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizop)ms 3 9piqkz04j8xm/flsqeq(k 2dk 7ntal surface for 5.00 s. The block’s kinetic energy strictly decreasm/ k8sxe0fdsz9p 3ql(k2pj q) i qmk74es 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 horizont+eb7t,d gy+aibc5 aasxl5g/ 7m-5 mjial surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this time /aim,7 -+lcj+7axgtdyg basi5 bm55e.
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 blo7a mc:z 870atrkd da,yck for 5.0 s. The block was initially at rest and slides on a horizontal admk87 rc zyad,7:0a tsurface.
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 block f. +a(qlbmthr r2id)2aor 5.0 s. The block was initiall)(22 htdamqil+a .brr y 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 m)ip g3xz 1metosja25 gwf59 )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 above situatixmgs1w)p mo23t ijf9a e g)5z5on?

  03.14: A fan blows the air and gives it kinetic energy. An hour after fn9w.kp2rvw dq*06 i na2jn6 rthe fan has been turned off *d26wjw qnn pfki9r2n0ar.6v,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a blockj,vf3l f io.y( of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/svyif(, .ljf o3, 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 textdjpc. pg. q8f:ms b/hx ra x5z);ukd0shd6w+8books 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 does he do on the box. The bugf d);+h8 ds/zwsdabp6 jpqc5 r kxm8:hx .0.ox has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepowesj4xe *faqen+ fzs5z- s,c 6u(r) of power to a car's dn,axf suf +5-6qes e *(zjcs4zriving 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 moves with sx :esiy qmhyu51u*)e 6 bctiv0d7u;f3 peed 5.00 m/s at the bottom of a rough, fixed ie5u0i ;ux6 hq3sib1f :y*m)eudyct 7 vnclined 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/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 mko2fwr11dl :up,t gy3u2df97sq bmw hgx34 5 b/s at the bottom of a rough, 15f2f o2 ,uw wtdrh3d x:y9p 34sgbl7g1bumkqfixed 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 trave+p j1 usfao;k4wh h3c4l to the right, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a4;u +csfhhpo aj3 kw41 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 tb yk*f(p,d.o-t 9byhlrvp+ /jhe time interval of the accelerati tpbp hj(9,*-lvroy/f.y+b dkon?

  12.08: Through what distance does the obje )s;im; jc+az8;ea i9 g-qxvcyct move during the time interval of the a8e cgq+ acy)smza ;;iiv;-x9jcceleration

  12.19: The magnitude of the linear m.h8:;e c iz e,flo5*mgt(xeo gomentum of a 4.00 kg point mass is changed from 6eo(;58iz gmc ,*eg.th o:flx e.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 mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed islh9th- (*fgt2jmjv i b*ppf 6+ increased from 2.00m/s to 4.00m/s. Which one of tijj+ (62t*gv9 pbpfml hfh-t* he following choices best represents the mass of the crate

  94.38: A force F at an ank q-xxritc z mk658lyv45d6-lgle θ above the horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at5y 6 t 8-id6k4crxmkq-l5l zvx 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)a mx;*yyxpe;p39ed p 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 speed will this crane raise a 0. e9)aed*;xpxy p y;mp320 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of thuxs9vs gg3 6iy:/k.s.j:lbd bih 1k2 ye 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 fallshgy vb g3xd. :ksbj 2/is1iul96 y:k.s 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 the fall?

  96.18: A rubber ball is held motionless a height ho above a hard floor and kne0 8ihxn h* b/0uds)released. Assuming that the collision with the floor is elastic, which one of the following graphs best shokni8 u h*0h/x0esd)nb ws 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 drivers6qva2t q pfwje qy, -:yan/;2 sees a barrier ahead. If the car takes 95 meters to come toe6 p2 -aqqtjs/nvqyaw2:,f;y rest, 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 untilp zd fz vcb k7+96u4k77d-3ssmqsax 61oiihg7 it stops. If the ball travels 15 meters, what was the average net force applied while it was coming to a stop?osgfqzhi7kupk m9-6s7 di4 c1v6 z73ads7 b+x

  02.26: Consider two laboroecbzsj)obf m058 g55 atory carts of different masses but identical kinetic energies and the three followin)oe j5b 5zo5b0m8s gfcg 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-kgballyc+ +nnmcyp9+yb14 f t of clay is tossed vertically in the air with an initial speed of +y n4fpt+b+19ccy my n4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from re hokn )26zn8e dzo0 0ci//lyndst straight upward 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 highest point of the motion. How much physical work did the average normal force ok ihc 2y8znoe0nd o/)0n6/ld zf contact (N) between the boy’ s feet and the concrete do on the boy?

  02.48: An object of mass M is dropped from aheirlm;f+ cgc *rk 1bzt8,ghtH above the ground. The object crashes into some soft earth and comes tmzcrlr k+8f1g,bc* ; 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 ground. The irf39h-rm 9sjpg*e m4 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 for-43se 9rripf9j*m gmhce acting on the mass during the collision with the surface?

  96.38: A pendulum bob m z c: zrarm7k0/ym)g6mass mon a cord length L is pulled sideways until the cord makes z7ycmmkzmgar: )0r6/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 o/;zryvoqp.3 :q o hv.yf 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 thenzp q/:3oyvoh..y; rq v 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, along a 10-meter rampkbr k47 sx s3ws9(um8z to a loading dock, which is 1.5 meters above the sidewalk. If3s 4xkm87(rs u9bkzsw each carton has a mass of 25 kg, what is the total work done by the deliveryman on the cartons to move them to the loading dock?

  12.16: A constant foe:x-bzcgu* pi8,6 lm pxdu02 crce 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 ch8 egpcu2i :*dxm0zx-b uc6pl,oices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are eadi2d)e j5-) -fng a fl:2mp4wkzw:cqlch dropped 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 are the me za 2)fm4wdg)e2- :w: cpkijqldfl n5-chanical energies of the two balls changing?

  11.28: A person throws an object of mass M 97r0 jpj kdu6qstraight upward with an initial non-zero speed v. The object rises to a maximum height H above the laju6 90q jd7kprunch point. The person 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 stretches a spring that has a spx ced+4 k88 hafvnot:(ring constant of 20 N/m. The potential energy stored in the spring ist8+:4ka 8(ef dcnhv xo:

  97.10: A compressed spring has 16 J of potenryj)holk8qq3h s :hk2ya:( +etial energy. What is the maximum speed it can i2)rhojk3y8:shyh l:kq+a ( qempart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incline oxward:jpqa-j4e pk*7o 1 s(j8f heigk px q:jej81a4 p(-s7owadrj*ht 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 between the incline and the object for both trials.