97.01: A force F directed at an angle of θ abovew j .oeb7ef6+e the horizontal is used to pull a crate a distance D ac +be7.f6wj eeoross a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, drjfqwi6b7( w84h r8t which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distan4ft qi7rwdr b h886wj(ced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheetxea 5+5klc/ nx of wallboard 3 meter above the fln/+ cea5xxl5k oor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizontal sya:1ne+m ebz.urface for 5.00 s. The block’s kinetic energy striee+m1 :aznyb .ctly 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 uniform acceleration on a horizo)pad*qvj( kx5 ntal surface for 5.00 s.)jvq(xak *5d p The block’s kinetic energy 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 directed to the right is exerted on a 3.0 kg z*8h 9ev/p sgyblock for 5.0 s. The block was ini8e yp /s9z*vghtially 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 ep.bq c2snv.o ,90sesvk 6,tv mxerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal s..6 vc2 s m 9kssbv,vpn0qeot,urface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a frictionless ,obbd7 y, hlh dn1yg7:frozen pond throws a 1 kg hammer ,byh1yd g h7b:d7on,lin 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 situation?

  03.14: A fan blows the air 0/;zste sr3ajand gives it kinetic energy. An hour after the fan has been tusrj3a s; ezt/0rned 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 wdoy p5; :5nhed*kj )kof 3.0 m, a speed of 4.0 m/s, and an accelede5 5kh:y;)wjn kpd* oration 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 she a(j3- jc3xy+nlmh ql9n39vqvlf in the bookroom 1.3 m from the floor. If the janitor relocates the bo9-3m lj9 qcyhnq (n+jvx3 a3lvx 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 * lq1o)fm tjpfz uqzf-2;zd* ,(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 ;*ml1,t-*z jq )f fpzfq2 oduzof the retarding force acting on the car?

  09.13: In the figure to thho6j3q/z8ndyo5+ d rfe right, a box moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant accdq8 3/o +orhz 5j6yndfeleration 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 r tg8r2z6jrbb/ight, 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/2 6jrgb8bzr t 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, each starting from rest, htzr.y(as) 4p along a straight roads(4a t.hp) ryz. CarA has twice 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 obj*jw 3/a/1(hhpisvxxi v y,l y3ect during the time interval of the accelyw3hh*v3 yi( ijxvlx 1/p/as,eration?

  12.08: Through what dv.c0 8v7gm 6gmkeom 3qistance does the object move during the time interval of the acceleratm 03 km6.8ovg7qevmcg ion

  12.19: The magnitude of the linear momentum of a 4.00 kg pr oj*p1*:x pan ea.1maoint mass is changed from 6.00kg.m/s to 14.0k:*oe1x rp .1 aamapj*ng.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 2w+54i +qogx kcjozidwt2-q (of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents theqo-zwoi q4ki++ d225ctg j(w x mass of the crate

  94.38: A force F at an anglebh1 zaw54f0 b8zl3te h 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 sl 3zb 8hhf0e1z5ta4wb uitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward forc87s w at5a 9u iw9wp6f7z7hgjle and delivers a useful power output of 0.10 w to raise a block vertic7 57suhpaf89iw 7 9ja6zwt wlgally at a constant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near tkx ;+l9d8ekzg j*5s. pwksm z7he 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 fog+s j87l;*9pz k 5xzk.dwe mskrce acting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionles ski(;no d)uw(s 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 between the total energy E of the ball and its height h winku)((o ds; above the surface?

  07.06: A 500-kg car is movinyhysxvy j ;ig:5 -s9,ag at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest,i y-jys ,yx:;v5sa9hg 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 u)lezxs3 xi4 1zntil it stops. If the ball travels 15 meters, what was the avi sxez 1l)43xzerage net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masse:gg k39vkyrgk;5 4qx zs but identical kinetic energies and the three following statementyq :zr5;k4 gg9 gx3kkvs. 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 with an initial spds dohho6h 7v:f3)b.x eed of 4.60 m/s. Ignoring air res o xbv hf:sd37ohdh)6.istance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upwar ebiv +i*j 6:8t; ;iytdoi81rzkvrx/t d 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 yb d/ roj:r*1e8i+ zti; i;8t6itkvxvdistance 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 grouni 2tbap3u(nc *0v1 ty hlr(7dtdaru8:d. 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 ave*au d3dta2n p c8 (b1(lhrrvy u:ti07trage constant force exerted by the ground on the object while coming to rest?

  12.48: An object of mass M is dfz;vdv7 ju2i4 -c7pv wropped 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 average net force acting on4c7f vz-2i vv7wduj;p the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sideways until t9iio)x 4vksm, he cord ms4 voi,k9x i)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 s)nx++srwjb oz;o 9sv/srn ),angle. The sled, which started at the bottom of the incline moving at 10.0 m/s, rises to a hei,)/roosjxr+ ; 9sn+n) szvsb wght 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 sidewalk, alongnzne2 8 px:k9t a 10-meter 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 denke:xt9nz 28 pliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is applied for the w*dc/z1t4;qo e8 nrps 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 F onthe box for the motiont nzrc/sq8e p*1 4ow;d?

  04.48: Two identical bowling balls A and B are each0wky.fu tzjpu 9r 5sts o98q6. dropped from rest from the top of a tall tower. Ball A is drot t 9pqk69u zrfjss8y5.wo.u0pped one second before 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 mass M straight ui s 8(czgbx9g/zt(yxtfs-b tbc 2t) cc78ts*( pward 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 objetccty-(bxs c9z82fb g/ti)st7zg(b( ctxs*8ct 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 confajs f2zfjx zw+1tb g4/4l l93stant of 20 N/m. The potential energy storlzj4wfg stf 2z/lx9j 41+fab 3ed in the spring is:

  97.10: A compressed spring 19a0p ysr: dmyhas 16 J of potential energy. What is the maximum speed :m 90r1yysap dit can impart to a 2.0-kg object ?

  

  10.31: An object of mass M slv; c v0.9wolf9 ial3ht4qb c pf,6u;*t wag1utarts from rest 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 diagram. In each of the trials, the object reachesu9qv f1fl9o i3l 4cv; .ucat;0glw6hwat*bp, 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.