97.01: A force F directe2wgdeb;fgk2 su 2e+/md at an angle of θ above the horizontal is used to pull a crate a distance D a2f; med2ggkse 2wu b+/cross 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 jcy3;yxd iymdm-w6q :-, bd+ywith horizontal speed v. While bringing thedydmq-x j+:i6 3yyydw ;cmb,- 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 k(mexosz; gprrnhj ;8iv 2uqj)*;y (2a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow mu)j(n ; pk2zhg xymq 2*s8r ;;(irvuojech power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniforg;icbn6*-9axzvd xk 4m acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in 9* -cn64gvxd ka;bzix 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 a9 q5nf5t*lhit6ydvw mc -q5 0l horizontal surf-h* lt5m5qic9ql vn wt56fd0y ace for 5.00 s. 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 di wjfe,nk;sm,13txxdf 37 m4firected to the right is exerted on a 3.0 kg block for 7wf f ,x3mn,1;3kjexmdsf ti45.0 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 directed to the right is 5rty b mwn5n6 z7-xuk1exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides onb -6km1t7n5 5rwyzux n 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 frozen pond throws a 1 kg 0ncjz(3c;u3pt kvpj 7s u +s:nhammer in one direction. After the throw, the hammer moves off in one direction while the student moves off in the otj u0jzs3p7p+n uc v:3n;(kscther direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour after dnbpdg f4ghkhpg63 l8uj, 917the fan has been turned off,g8gfnp gb 37dd94hhjl1u k ,6p
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 3.0 m, a spewn9 hkkhm, q* 18u:nygn- u(waed of :u-,uk (nqw1m9yagw 8*khh n n4.0 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 sh mo +4u bbzz99wby)r3relf in the bookroom 1.3 m from the floor. If the janizuwyr+zm b 994rbo3b )tor 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 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepower) of pobqw b +)84 b(jtosncs/wer to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65 mph), what is the wj/s (bc48 n+)sbobqtmagnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box wl 9502t( tiwhql; gi73f/)taxqpz 2i z 7zxnumoves 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 incli h g79zii3i7pxl)n5q2fw tq(/att2xzlw ;u z0ne 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/hd3b+dhe :o4 us 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 2.50dbueh 3hd+4o: 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, each starting from rest, fi+mjdv;0r b.along a straight road. CarA has twice the acceleration of Car B. After travelib. j+mdi0f ;rvng 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 intervalcahlncl*-5 l6g wik0- of the acce--nlch kg6w 5i0l*calleration?

  12.08: Through what distance does the object move during t (gmdohm9l dcup35i+3he time interval of the9dm3mi5 l3 oc+(dpu hg acceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass3i2p h1 bst)fs 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 kinetics 1b)ipf 32ths energy of the mass during this time interval?

  14.11: A crate gains 36.0 J oobm5yrs i71k,z)np p:f kinetic energy while its speed is increased from 2.00m/s tob m o1zkip5n ysp:)r,7 4.00m/s. Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is usei 74gj 8o 5f:iyg 5rbkusvtk56d 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 done by t58krvg: 56jt4kii75g buyosfhe frictional force is:

  14.31: A toy crane ext0(d dkt:;ls5peiwfs x +h2fz)wzi+ 2 erts an upward force 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 cranw0+tdt2 wi;pse +lsi 2dh: 5fz)kzfx (e raise a 0.20 kg block?

  12.18: A 1.00 kg object is releas3p 7hzsyfy/.5rq8 mhted 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 thm/5hysy7h3p t z8.qrfe 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 (k y8 jck;h*xvreleased. Assuming that the collision with tkk(*yc8 jvh x;he 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/mq2s ;+7ocp .e7my9rn:m s sscs. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what iss ;rms om29 mycs s.pe77cqn:+ the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down 1r2p ,1n5j vn(gmhn msd./rvbuniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was coming to a strh11 dg/bvj,npmnv (2 sr5.mnop?

  02.26: Consider two laboratory carts of different masses but e8w xgv1, lo:ni2/r8uhx x 9ocidentical kinetic energies and the thn821 uxoerl,i8woghx 9xc/ :vree 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 of clay is tossed vertically in the a*i5g(dca()y ipzd:oq ir with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy iid z*go5(d:c qa)yp(when it reaches its highest point?

  06.20: A boy jumps from rest straight upward fzq7*u beci uj60e(0ne rom 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 the highest point of the motion. How much physical work did the average normal force of contact (N) between the boy’ s feet andz(ebej*i 00q7e6uc nu the concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH above the ground. The obja bae:c;r hlo,/ 30rza1 nts.lwmq* *wect 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 ,*o:wacwz/10abl* hrtl 3 en;r qms.a the magnitude of the average constant force exerted by the ground on the object while coming to rest?

  12.48: An object of lvka/:day7uv*p )l-fmass M is dropped from aheight H above the ground. The object bounces off of a horizontal surface in a collision lasting k: dpuv7f -yva/a*l)ltime T. The object 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 cord len 5apz00 txkc5ak/n1 mjgth L is pulled sideways until the cord makes an angx 5 10/maka50 jktnzpcle
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 ht;3n*/2 qagywsy k* ysled, which started atsg; t2 ayh*ywk*q/3yn 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 its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, at4tw d.0k,i otno ab,,long a 10-meter ramp to a loading dock, which is 1.5 meters a .ttd,o4bkan,o w ,0tibove 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 forcetyhry+cy69t, , /xib e F=50N (as shown in the figure) is applied for the 6.0 meter motion of the box upward along the incline. Ti, x c/yy,+tr9ty 6hbehe 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 r0 vsgn*/t/-lnv9id l7 alm 1ndest 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 energies of the two balls vl*tiadnn0v97 sm1/nld l-/g changing?

  11.28: A person throws an object of mass M straight upw(lsb3rz75m+ 1 lr )3wx ncqkxward 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 Hn+)mrl s1rkwz3qx(b 37lcw 5x, 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 t fj1o9ioe3-8;hns0 ,a/vgdn +z 4nwyw9ois cp hat has a spring constant of 20 N/m. The potential energy stor1-/za308pjsd sii49+y nno fcoo9w vgw;,nheed in the spring is:

  97.10: A compressed spring has 16 J ..b0w0eh fnhlof potential energy. What is the maximum speed0 ne. f0h.wblh it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed inclqp5myjxo6lh(,zy )j h xy 310sx(sa0 bine 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 kinetlo(a16y (x 0 jyh3 h0bjy zqpx5m)sxs,ic friction between the incline and the object for both trials.