97.01: A force F directed at an angle of θ above the hor:kto-mo 0)v akizontal is used to pull a crate a distance D across a level om0t :)a -kokvfloor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is moving toward her a5ha2o600(mtck x hmhwith horizontal speed v.caakm2h htm hx5( 0o60 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 is

  99.14: A construction laborer holds a 20 kilogram sheet of wald68,wngrw /*omyb9gq +- hnq1yphb9o lboard 3 meter above the floor for 4 seconds. During these 4 secondshow much pb989bmnh1gq*-y n+hrgow y,q6/wo dpower was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration /du*)yyd/0yu9m kyx;hvad f gn,u) i6 on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J inu yhdf 9aniy0d m*gu6) ,dx/ k)y;uy/v this time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slid g0r3,q4fng +a peq1emes with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 Jeqmqgp3e140 g+ an,f r 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 dijkmq bx6.(vx0qzy3fnjn c3 ((rected to the right is exerted on a 3.0 kg block for 5.jk3j fyqv(q3(.x 6( zxncmb0n0 s. 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 p5zfap8z46 udk,.+ pgh67uqq i* czhv directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at res4p8zku67+ fizcu hzqv6qh , g.d5pap*t 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 70g+zf8 fxw :byckqf- 4e 3tsoat 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 74:stf0fy -zx+e qc8k o3fwbg off in the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the aim+fqyg5 xib*tn (h2,ur and gives it kinetic energy. An hour after the fan has been turned off,ut52qmxb+( iyg,nh *f
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has /i6txre 5 lenipq9,)fsnb7)i a position of 3.0 m, a speed of 4.q)s/ixl5) in tnf,e6ei7rp 9b 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 in the bookroom 1.3 m from m(+m8bxxsn. uthe floor. If the janitor relocatesmx+mnu(sx8 .b 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 kg.

  02.32: An automobile engine delivers 24,000 watts (a0sfasj5 p9 .aefv4 /(tvse: k gl.6fvpbout 32 horsepower) of power to a car's driv paff (4 pgtlj9v:5e /a ve6.fsvss.k0ing 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 mozt/:+ -i(fumucdev1va8o(2 ti6 saoo ves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The b2tcsi(uo-odu zvamvf81(e +: ot6 ia/ox 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 m/s at the botto9t0urg ,n7pwbm 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 ,w0gtr7 p nb9u= 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, sk28 g(svxe 6 xay6ww.jr8l)ueach starting from rest, along a straight road. CarA has twice the acceleration of Car B. 8e2xwgy8arlj)w66s xsku v (. 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 object during the time interval of bfoiy /5gcv,tzumi / y (a7:a,the acc/ mt,f/oa7y zgiciu5a(:,byveleration?

  12.08: Through what distance does td6zn bks7tg;a g9s0j (brc 2g/(n/dlahe object move during the time interval of the acc da (scbalzn; 0b d/ s92ggjgk/(tr76neleration

  12.19: The magnitude of the linear momentum of a 4.00 kg sf1)bvh3 sc f/,xc9bx point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What b1 v,h/fbs3c s9cx) fxis the change in the kinetic energy of the mass during this time interval?

  14.11: A crate gainst)l;a 7sdzda.vh5 a7n 36.0 J of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choil7 hnaasd5.) zv ;dta7ces best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull a heavy579lgclrlnl 1s 5jel6 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 worjl1 ls5 69r7l 5cegnllk done by the frictional force is:

  14.31: A toy crane exerts an upward force and deliv5s3iu)yr lmb.zq3 5j /v+0sj+zk paio ers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this o3 qri+up5b)svj zk/la 0s3 .j+i5ymz crane raise a 0.20 kg block?

  12.18: A 1.00 kg objgjhe ogv./s,i f7nk 9f)ius.2ect is released 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 7 f9enghj u2,fki v.igs/s).oacting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a height ho qm+iiwl yx3szfq0 )*7tsl:*xay )d (kabove a hard floor and released. Assuming that the c)xf*q+y37dk*y: axzq (lis ) wsltmi0 ollision with the floor is elastic, which 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 barripmdwn(la*897*wof9 sbf,z lfer ahead. If the car takes 95 meters to come to pawds (f 9f*lf9z*7 won,l8 mbrest, 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 until it sjn5 q t6 hu+3g9iqwwf1tops. If the ball travels 15 meters, what was the average net force applied wh1ih 3gwj6nf q9wtu5 +qile it was coming to a stop?

  02.26: Consider two laborat1xs+.y(dy hm2 lrqo 3uory carts of different masses but identical kinetic energies and the three followinsd+2 y( h1rouy.m3xl qg 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 of clay is tossed vertically in the ae;i0 )/ bhimec8kpd df9.y,.oag lyw6ir with an initial speed of 4.60 m/s. Ignoring air resistance, what is the chm ie.ddwghbk;6il),afcyp0e9 8.y/ oange in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from adh d-6 n5ar(wi -biv(ai *)r.aj,neaco-t 0im 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 wor6in -t( 5arid*j-)crv b0 d n.em,ihwai-oa(ak 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 aheigr )eqn,j( mb u15r43r cx7vpuxbbt*n7htH above 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,trx3pnuc47ej175bnx *rbrbv qm u(,) 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 ir1dk y 0l56nfks 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 maximum0ydkn6 kr1 5lf 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 y( qz1z95 oljhm6j(k0fd urmud.1se7 cord length L is pulled sideways until the cord makes an angle held(mouju9f71 .05y(6 mdjzks z1 rq
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 z+vma)vh y*a8uniform 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 abovh+v)*a yaz v8me 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 sidewalk, along a 10-mpvds (jy ,jjwnjsp l v8)99:*deter 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 d p(sj9j sdvj ,:p8v)ljn*9ywto the loading dock?

  12.16: A constant force F=50N (as shown in the figure);mq:md.pn 9 -dt89hkj nn q(yo is applied for the 6.0 meter motion p9mqty;8. kdjon 9 mq( n:nh-dof 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 F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from rest from thexyzrb.oou / , 5j+4vpxt+ .zuc top of a tall tower. Ball A is dropped one second beforu4o v/z.torx+ ,.5+pjcuzxy be ball 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 ),/,ovjq8vddq3umyfr .e0r 0z- tuqy mass M straight upward with an initial non-zero speed v. The objecquzy,dr)jr- dqymu 3ofv0qt /0e8 v,. t 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 sprnmkz-w 4g r:7f vy+6e-o6hb lting that has a spring constant of 20 N/m. The potential energy stored in the spring ieb k6n zl7-m4wvgfro+:t- h6ys:

  97.10: A compressed spring has 16 J of potential energy. What is the maxw8 z1 suxs xhz*grc:59imum speed it can impart to a 2.0-k*sw h5z:g9u1r8 zcsxxg object ?

  

  10.31: An object of mass M starts from rest at the boh y34i/ b93z7lur6 kvq vsw2nattom 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 nia by64w kuv 3l93r 2s/7nqvhzon- zero coefficient of kinetic friction between the incline and the object for both trials.