97.01: A force F directed at an angle of θ above the horizontal is used to pu-;(3)cs thhsm6jfx lh ll a crate a distance D as3lj)h6hhmt -;fc(s xcross a level floor. The work done by the force F is

  97.33: A softball player catches a ball of ma(z6i *4t+g5ywlv wc brss m, which is moving toward her with horizontal speed v. While bringing the ba(w+t6v bri* 4zcy5gwlll to rest, 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 a 20 k* / ,egtys*4ahsaj 4pks0y eh.ilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the wallboark,j y04s s tp4ag .sh**ah/eyed?

  17.11: A 5.00 kg block slides with un.ebe jzq,j*3) dbif*d7 wshl2iform acceleration on a horizontal surface for 5.00 s. The block’s kinetic ene3j f.bls2qd*jewh)*zbi7 e ,d rgy strictly 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 u:njb,lbcq, bplo 1vv1 q.q/*j niform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases fo/ vbc qq1,lvlbjq*:.jbpn,1rom 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 n,vw-5gf4 jrfcyj,3ybt:hs1h 14f:d 9xlm pd a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surface.cdwsxh 49:15, p:fyh, yv l d13nbgfftj mr4j-
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 x:6g(swu*avi,sp1b jrk 2 )dtbo9 i:akg block for 5.0 s. The block was initially at ) :p* (is 6ot:9 vrw2jiubbakxga1d,srest 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 fro(yu *d b6wc;hmzen 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 fhcm(w6*udy b ;ollowing correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour after t n)w+mfxi2xj s3 2tn/khe fan has been turnefni jm3+2kns) 2t/wx xd off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has a position of 3. : evglt r,+wnun3t67:+koxyv w3e7bi 0 m, a speed of+u 6w+v rt7:lx,nnbgo twi3yv3 7:e ke 4.0 m/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 textbooks is on the middle shelf;jt- h uu3* gct3ml3nb 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 box has a mass of 10.0 bj u3 uthl 3n3m;cgt*-kg.

  02.32: An automobile engine delivers 24,000 watts r1rt *i:,oe mqw l84ie(about 32 horsepower) of power to a car's 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 lmoi48, e re1qrt:*i wthe car?

  09.13: In the figure to the right, a box moves with spc 2yo5mqsn2an/yx)-tir9 -nzti7sm1 eed 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 ofF = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the top o-2 51yii)amxnmts ny9c-/7ro2ts qn z f 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 speu)//wc p gd7 1qdj;nsgbft1*sed 5.00 m/s at the bottom of a ro*c7 ngdf1pq1/dwb ugs );tj/s ugh, 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 the incline.
How much work is done by the applied force F to the box?

  11.30: Two cars travel to the rightb +ke-,m kkso8x2zjk: 7 bau q2ar70yg, each starting from rest, along a straight road. CarA has ms08k+72x27 rkeg y: ,abuk jboaq -zktwice 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 force acting on the o6 d.biay,uln+ bject during the time interval of the accele+ny b.ild6,a uration?

  12.08: Through what distance does the objecmnma 3/sd(a(2wlwb6u 8 mg:l v8yjr7 tt move during the time interval of the accelw: dy(/uwjngl3vma a bm7tl2 (8r68smeration

  12.19: The magnitude of the linear mokdz :d4;l,o i,1e njqbmentum 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 en jekzo:,n1iqb,4ld ;dergy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its spe4bv xyfx,(yf5 ed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the 4,y (y5fxvfxb mass of the crate

  94.38: A force F at an yawmx puknh4,) x63w/ angle θ above the horizontal 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 suitcase is μ. The work donpx, wwy /xu3 6a4h)mkne by the frictional force is:

  14.31: A toy crane exerts an upward force and delivers a useful power output ofsljx fj )6hzj:zr( /i7 0.10 w to raise a block vertically at a constant speed. At what constant speed will t /xl)jrf izs( 6:hj7jzhis crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is rer6x:w xhwb- -pvonc8v7uocg (/ bp f+wsi-0k,leased 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 by the gravitational force acting on the Earth by the 1.00 kg objectkv cgcp-wb s 6b-wvi, w+n:(xp/-o78fr0xuho during the fall?

  96.18: A rubber ball is heldt4egw,6e -h b9:ch vdja4u(ay motionless a height ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relationship betwba hgyva ee,u4hjd6tc94:(-ween the total energy E of the ball and its height h above the surface?

  07.06: A 500-kg car is mo7tpbugd1a * 6oving at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude odug bp6ta71o *f the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down unifort):m idr4abi8 mly until it stops. If the ball travels 1di: a8mrt4b i)5 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masv7tya,+rr1wkfyj-izdx2o w6;cwi 0: ses but identical kinetic energies and the three following statements. Which of the abaor-zv f 72 j+r1y ;:w dwi6xti,wk0ycove 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 in the air with an initialo (pw9c06o q oerg/x+;fu-y wl speed of 4.60 m/;(gwu-focp0/6y+oe o9qwlx rs. Ignoring air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest 2fpfguup *ocp/8 6r s,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 opsc8*uf p 6g/ruf,p2the 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 bifol; b6g(o59e; 59ceom m jsground. 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 forci69co( 5 osemb;9gole; j5b mfe exerted by the ground on the object while coming to rest?

  12.48: An object of mass M is dropped from aheight4n3e9dd:yhgq,+y bprioi+ ksl2) qq: H above the ground. The object bounces off of a horizontal surface in a collision lasting time T. The objeogsy:,2q ) d+h43i:by+rqp eqkdi l9nct 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 g1f7a7:k y0lb:psobk cord length L is pulled sideways until the cordkp0gfo77:l k aybsb 1: 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 bs,kve+m j 6++ llxt*funiform incline of unknown angle. The sled, which started at the bottom of the ikt+s+x6e +mvb *f ,jllncline 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 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 sidewalwdrc+ n53c/hg 0sh6do k, along a 10-meter ramp to cs dhc/or+h3 065gdn wa 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 to the loading dock?

  12.16: A constant force F=50N (as shown in the figure)y3/a; lrppy t6 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 forcey a6/;l3p rypt F onthe box for the motion?

  04.48: Two identical bowling ba , / *aie nprz-+uwiuoo 96ipit.30rlolls A and B are each 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 mechanical ewtn9 zie6.o*r3+apoo ru -0 uiii, lp/nergies of the two balls changing?

  11.28: A person throws an objojio81zm91uwha,,w)+gv un dect 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, to what maximum height does the object of mass 0.5M rise above the launch point? Ignore air 1n8w+jh,uo91w iougm)azvd, resistance.

  96.20: A force of 10 N stretches a bz* kh2m q04o(*ef8xn d xlxw7spring that has a spring constant of 20 N/m. The potential energy stored in the sprfbn*4ehd 08xlx 2(omxqw 7k*zing is:

  97.10: A compressed spring has 16 J of potential energy. What is tij(z1qe +4xfu;1 1l -5+tslehvlh jqhhe maximum speed it can impart to a 2.hts1e+l-lq+qf 1(j; h1vjzhxe4i5l u 0-kg object ?

  

  10.31: An object of mass M starts from rest athly (gmm:nu88 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 friction between the incline and the object for both triamg 88:unmly(h ls.