97.01: A force F directed at an angles :yjz(7zvv 0ad e,ua3 of θ above the horizontal is used to pull a crate a distance D across a level floor. The workd0uaav:(3 svzeyj,z7 done by the force F is

  97.33: A softball player catches a ball 2vdc 9lo.o1m u jc;;zb*fgvrhoo(n8: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 r.ocf ;(; 9z con1djv :oo 2gl*m8vuhbforce exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilograjzok3v 13om l 9n/2timm sheet of wallboard 3 meter above the floor for 4 seconds. Durimlo o 3ntz9/1mi3j 2kvng these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform ac:8 th7pa8i mn*mi hbnv0zh8r c.0icr-w w+9fcceleration on a horizontal surface for 5.00 s. The0 m 9:pwit nhwf87 arri vhnzc80+ c-.8bmh*ic block’s kinetic energy 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 unifcrna0 znrp b1+*xa3 *worm acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 * wax+1p *z3r0nnb carJ 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 r;6tuvu47144g hyg war5qmkq d ight is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surfa44u1;wgqak4 r5y6 tgm d7 huvqce.
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 exe2y ).ct3op7 ,(me iayyfs3 oc7hr*po 6mve3le rted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surface.7y)3yar3 eyhpfe.v3(o 6m*ocic lt7oe, 2m sp
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at a7um0mg96iwr 6yfi:ftq5i 8 f 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 r90mauigf5w q 8f:i7t6f m6iydirection. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and hp s3o6d0.bcpgives it kinetic energy. An hour after the fan has been to3h 0s6c.pdbp urned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mas i kc5sy*/9zois 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an acceleratio*iiso9 5 cyz/kn 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 bo -bbk;;)aw)/b nggcfqokroom 1.3 m from the floor. If the janitor relocates the box to the shelf that is 2.6 m from the g b;gnfw)a;bq-/b)c k 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 2,v6i;.or:k d4 nrwck s4,000 watts (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 actk6 r wrkiv.: 4n,;docsing on the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s at thh lt,qv4 v27b+r6jl q7kx8qtle bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the incl7l,2l 7h kltxq4j+ vq6q tr8bvine 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 w 5 n/)(gsfib49lsql8jimv i j4.v-rw +c ;yqqthe 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 (w+;ism iq9-85j)v4 rgiwcb l jl f.qqysv4/ nthe incline.
How much work is done by the applied force F to the box?

  11.30: Two cars travel to the rightu t k+ibg;:va:, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After trave:+ b uit:vka;gling 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 dy.o1z-6izm. us - auxnet force acting on the object during the time interval of th--z.xzoidum .1yu6sa e acceleration?

  12.08: Through what distance does the object move during k9hd6uqgo. q0nv -ha1r5f fu0the time interval of the acceleratiq0-vg f510 u 6uafdq9norhh k.on

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is chanw; 3az02,az 3pnob+bpydom.:alu -guged from 6.0- o+bazupu.wan a,m; yg23 l0z:3p obd0kg.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 is incrd8aw 7ecvk 4)jeased from 2.00m/s to 4.00m/s. Which one of the following choices best rekev48wa d)c j7presents the mass of the crate

  94.38: A force F at an angle θ above the horiz2nsnod :m/tb3v/()6 sprbe g yontal is used to pull a heavy suitcase of weight mga distance d along a g m/b 3n:(vnepbod)ssy6/t 2 rlevel 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 fororztc s +.nv b6qd+58.exo;cgce 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 0.20 kg g ecq.oods v.t+r8nzc+;x6b5 block?

  12.18: A 1.00 kg object is released from rest near the suq8n1z2blgfa *j fl*r4 rface 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 mt42*fagbn8 lfjl z*1qro 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 u8 +ampp +,22nwopgfz a hard floor and released. Assuming that the collision with the floor is elastic, w2 mz8+gn+wa ufopp ,2phich one of the 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 28 m/s. The driver sees a barrierdw*8h i.:y trpoi te)5 ahead. If the car takes 95 meters to come to rest, what is the mapetiy ).d8o *:whr5t ignitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly ca :hej-92m b5+tfoc: phf-pc b,ys)juntil it stops. If the ball travels 15 meters, what was the average net force applied while it was comingy-je, bao-hb hpcs9)p m2 cc::5tf+fj to a stop?

  02.26: Consider two laboratory carts of 1akr 6ebnd7wj yum 74t6n(;,5gfdliy different masses but identical kinetic energies and the three following sim(n kgdba n ;f5uytw6r4lj y e6771,dtatements. 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 of clay is tossed vertically in the air withp* cstzwej49ok dw; 5- an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential ee wcsjokw t9dp*z4- ;5nergy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward ouyf6s6/e/ byfrom a flat, stationary concrete surface. The boy,b yf6uo6eys/ / 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 concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH above the ground.2)u 9-q/iosw1griqts The object crashes into some soft earth and comes to rest by compressing the earth a distance)/ssr 92o-g1wituq iq 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 mass9c(4*jcdgiix :+m uvtr.yx;z M is dropped from aheight H above the ground. The 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 aver*:jdczrg; +m94 cvy(u.xx itiage 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 sideway o(qxkr75p rh 28bedb4s until the cord makespo5e74b k 2 qhdx(brr8 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 auh wcg .,,6)ifv8ipbmngle. 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 then slides back down the hill. What is the sled's speed when it returns to it.uwmc )6i8 vi,f,pg bhs original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons frvftv:4d a74xru9c*xb6.yu q fom the sidewalk, along a 10-meter ramp to a loadingduf6. *a b4xtf9rv4 u7 :cvqxy 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) 6vmw+:emxzgksx ay-g q1e.2,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 force ,e z2ke.gxg-1m 6smqa y xwv:+F onthe box for the motion?

  04.48: Two identical bowling bbk/ynf(m * 0poalls 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 k*o (p/m0bynf 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 o)2fi*by 9yl( j lhof4f1o5luvf 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. o *4ffll2j5yyufbi)(v1 lo9 h 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 N1gi +0l;a qi+t/ykyjq/m. The potential energy stored in the spring iyq1++aig l/0q ky;ijt s:

  97.10: A compressed spring has 16 J of potential energy. What is the maximumtjcl3 +ysw5t /4xtvq:1 tuuc0 speed it can impart to a 2.0-kg+t /uc5uqy3t 0cstxlj4 v :wt1 object ?

  

  10.31: An object of mass M starts from restbjc ph6m1;s v9,x;qrx 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 sbpxj9,rqm1hx c6;;v 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.