97.01: A force F direc6 ju .a,jisju0yu : ft7gtn) pf785fgpted at an angle of θ above the horizontal is used to pull a crate a distanf ):.uuuj80ta7pf6p ijn t,yj5fg g7s ce 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 toward her ;t cmkwk 7p- a6qihge0 0*c3mbwith horizontal speed v. While bringing the ball to resh mw3i 0eacpcm;bkg0- 7 t6k*qt, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a8bn5/r m hr,rs;ztj ,a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. 5 ,z8/jrn;,am r hbtrs During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform accelera 3 gku7/g-e7.uixkl-ins:y qption on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 5gy xk7kup:ulgis- -e 37ni.q /0.0 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 acceleratiw41gqt(k9/sq c g nnv gi 79szl jzn(rp6p5u/6on on a horizontal surface for 5.00 s. The block’s kinetic energyg1kw i(q4n6vnt7/l6 /zj5sups gr(zq 99nc pg 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 directe n)hw* zpgh 0jeh1,k nykyw,05d to the right is exerted on a 3.0 kg block for 5.0 s. yzhkk0 nyhg*p01n j5hew),,w The block was initially 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 exerted on a 3.0 kg tubzw; lx3le2 .h q8k.6jhi.gl,i 7nq block for 5.0 s. The block was initially at rest and slides on a horizoni ll68;u3b, q. hg7tjx.zneq.wh k2li tal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at6 0hsfgcdhb d1vp11 wa;sv(q2 reston a frictionless 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 dg(dfshsca10q1w 1v6;ph b2v correctly describes the above situation?

  03.14: A fan blows the air and givxu6hhf+k)b6iqur,-h * w0ct wes it kinetic energy. An hour after the fan has beuqh hcr660u)-k*w b+t fxh, wien turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg hl l q8a9hdpwgcz (u:(5as a position of 3.0 m, a speed of 4.0 m/s, and an acceleration az58 hqullwg (dc: p(9of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is on the middle shelf in the bookrte** yv3sz 3uooom 1.3 m from the floor. If the janitor relocates the box to the shelf thvyt s*o3u* ze3at 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 2q8b 6u z j;cz-um61apg4,000 watts (about 32 horsepower) of power to a car's driving whgzmbu;68u1-j za6cqp eels. 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 h-vq8xp(yf y 2wrt: +hmoves 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 conhwtqh2(x8 ypf+-y: rvstant 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 au d8fz;01.x 913ead ccv:p5jlwtn+ -jl hsfc.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the totdcupllnzf9 a8 c +0dc-3vah:xsej1f;.15j w p 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 righmrxfldc/9 d8,/ m1j fdbkp0c-t, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car B has tra c1pdm8-k/ ,m/frl09 bjfxcd dveled the same distance F, what is its speed in terms of B?

  12.07: What is the net force acting o;s oob0u*wrf5n the object during the time interval of the acceleru;r5b ofw0 os*ation?

  12.08: Through what distance does the object move during thega/xu3jg /0e/thkbj 6 a .q3lot) )tab time interval of the accele6 /e)t. k)tbgtj x3loaqbu gha0/j /3aration

  12.19: The magnitude o.;; e2d;t voopuxpov; f the linear momentum of a 4.00 kg 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 of the mep txv ;;ov2;;o.opu dass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is ii ewbzh 1(mi38+v bio8u5u x4zw6f5yencreased from 2.00m/s to 4.00m/s. Which one of the followif ebm+(h5wy3 o6x4e5i8u z i8wz1b viung choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is+ -lntcqccf4 ;7h9 l6cypdtx- used to pull a heavy suitcase p7t d +h4;6cytlxnlc-fcq-9cof weight mga distance d along a level floor at 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 an upward force and delio).o*h/+ct ju s9garys8y oph i:r f q)ae4l03vers 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 0.20 kg :)h te/o*clrho. sg fip+a03uayqs)8 4rj o9yblock?

  12.18: A 1.00 kg object is released jf 5dre*paw. ,from rest near the surface of the Earth, the gravj5,fe . wdrpa*itational 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 the fall?

  96.18: A rubber ball is held motionless a height ho above a hard floor and rele8; mwaiqb o a9y9eh h2nnur04 n-hh0r5ased. 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 r5;hm00hyhh e iaoa9nnwrnq- 9u248b ball and its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barrie z*o89m/tk ta,jyr/rz2; ozgg n y/l1ar ahead. If the car takes 8z1lj* ryt/okzy z,tmg;9/ 2aogr/na 95 meters to come to rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving acrv1m)t4cm c 9t 15 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 tocrmtc)9mv41 c a stop?

  02.26: Consider two laboratory carts of y.bz egu :23+hw: ifgqdifferent masses but identical kinetic energies anq3h wi::z+.fbugge y2d 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 a7drfk8e m8 jmtai 1s k8;t,p2of clay 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 energmrkad28i7 afj, s t;8t1mkp8e y when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from se ncsq32ore/*.v s ;ga 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 of contact (N) between the boy’ s .o r3s2e qses/c g;vn*feet and the concrete do on the boy?

  02.48: An object of t2) zze*x7:p 2xdml1onaaqmt t/4r*smass M is dropped from aheightH above the ground. The object crashes into some soft earth and comes to rest by compressing the earth a distxt:lraxtnm47e*a*q 1d)zot /s mz 2 p2ance 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 abof yojdyn /ziy5oq8-h)/*pf*r ve the ground. The object bounces off of a horizontal surface in a collision lasting time T. The object then rises upward to a maximum heighn/oq**z d5 or8jiy/)hf- pyfyt 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 nt,b 6mt)o9,o2cdxwethe cord bc,2e)m,d9 txtn6owo makes 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. The s(bdbuls q 7los7y* nt9t4:xs:/p oz+hled, 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 tht zdposxb 9q74l7(/ hu:y stbos:ln *+e sled's speed when it returns to its original position at the bottom of the hill?

  06.09: A deliveryman mo+e2ptxp ) grl.ves 10 cartons from the sidewalk, along a 10-meter ramp to a loading dock, whr 2t plg.)ex+pich 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 to the loading dock?

  12.16: A constant force F=50N (as sh ff 8naz9pz36cown in the figure) is applied for the 6.0 meter motion of the box upward along the incline.68cn 3pz fa9zf The mass 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 dropp4 nttb t0t vii./gclzp288kg ly1- b9aed from rest from the top of a tall tower. Ball A is dropped one second before ba8/nlap i8 t g2gv. tk-yzcbl04it9t1bll 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 mb h1tt (a2 cb6tkgeu04ass M straight upward with an initial non-zero speed v. The objec kt ht(aet21ubcb4g60t 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 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 Nne2-bsarm ode(x* fm 6nl23o 2/m. T- 2mb(f ne6r* 2l2osdam onxe3he potential energy stored in the spring is:

  97.10: A compressed sprit4 tgt*;-a c+lvvwpt ,ng has 16 J of potential energy. What is the maximum speed *4pac ;l g-twtvv+ t,tit can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at 5ab*3ekfj / xx sqmac)nkdog8-m7h7+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 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 friction5kb f 3mc7gnxxqj sa8ko/7 -d aeh+*)m between the incline and the object for both trials.