97.01: A force F directed at an angle jm ;7 zziz*i/f ek8wc6of θ above the horizontal is used to pull a crate a distanmez wzc86 *k;ifi7j z/ce D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m,qvp;6 ff:+/m;5 xklr uz3duww which is moving toward her with horizontal speed v. While bringing the bl+;53fxkz f;vduqru:p / mww6 all 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 4 dcvjes4lt 1w5ab59y h1ozl,of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on51,l wyse4z49b1javl dctoh5 the wallboard?

  17.11: A 5.00 kg block slides with 7lc r2rqf +v1 rk;tkh1f+ir0y uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic en y21 ti+fkvcrhqlr +7k r;1f0rergy 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 uniform acceleratidf e ;afyr8gr-jq7sb 1 3,/xtnon on a horizontal surface for 5.00 s. The block’s kinetic energy strictr s ;re-t,17fb/fqxn dj8 a3gyly 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 rig+87zl dqw ha7. dzd/uwht is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal s d8q+zdhwzl/duw7.a7 urface.
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 o3 gtnn v-a3yn2n a 3.0 kg block for 5.0 s. The block was initially at rest y-tn v 3n2n3gaand slides on a horizontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially am3pmfyder. *e//9pbmhgcz c+ .u z4-sd+ lc4ft reston a frictionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one di/.szp brf. cec4m /ghe 9y md4+3u-cz*mfdpl+rection 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 and gives it kinetic energy. 8.ybch0r7, nbe ukzf2/wd ad- An hour after the fan has been ta8 we2 kncd.ufzrb0 dy7-b,/hurned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50t -e3q.7ofaot kg has a position of 3.0 m, a speed of 4.0 m/s, and an ac3tqt ofo7. ae-celeration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbook4ez8 )u(sef(q( mkzgoq(qk( ws is on the middle shelf 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 10kqe( fqzmeq8u4o((zk (s(wg) .0 kg.

  02.32: An automobile engyw b 68op1p ev+w1h;syine delivers 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a vyowsyh+pb861 e; 1 wpconstant 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 moves with speed 5.00 m/s a/p(9pbmz;og(ea4 f d ut 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 directl9f;udbppo(e/ az 4(gmy 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 tyym6 3+htt8 dehe 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 direh6+8dy t3tmy ectly 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 right, each startingtl9(nbs*r*+y6 zq b/+bpym mf :r5q hw from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car B has traveled th n/bm *+9 zrl(rwb*5:+t6pfbmyy qsqhe same distance F, what is its speed in terms of B?

  12.07: What is the net force acting on pnakpyaltq1v dh 9,a9p6;/e .+.feoathe object during the time interval of the acce .9e p 6d+av/pk1a,eon h;yaaf9 tq.plleration?

  12.08: Through what 3i(,a ;q jg-fvu uavl.-tev,edistance does the object move during the time interval of the acceleration.,(uuia3faje-v lt;qv- ev g ,

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is changed fed 4u3b;x l6eof4h:jpbx -x8/jlem i ;i6x e,arom 6.00kg.m/s to 14 xdap:34 he 6xfi,x4ombljl;8bx u/ij- e6;ee.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 of5azprj+u; z)y tg.9 bq kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices bzp)5b jr; gu9.z+y atqest represents the mass of the crate

  94.38: A force F at an angle h1v*mwa7zr,40 sp zqh 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 w*zhhs 0 qrm4,7p1avzsuitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force and delivers a ucbef m+r /eh 2 9o6+vw(b-xbjzo z,c3mseful power output of 0.10 w to raise a block verticaj+m9 z cer3x+efh - bbozb/(o2m,6wc vlly 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 frbvbjzm: n,hw d-6l.0a om 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 rep ,bl.jba:-6mndzv h w0resents 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 motionlesni 3j;w1(nva qcbks 40s 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 beij cvqb3nwa;( ks 01n4tween the total energy E of the ball and its height h above the surface?

  07.06: A 500-kg car is moving at: ev4cwd;u : 1midecb;: ia+mc 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force necessarmvm:ud+c diiec; c 1:b we;:4ay to stop?

  00.26: A 500-gram ball moving at 15 m/5;dw kqagyxz el03exck 9:a/r0j22 ljs slows down uniformly until it stops. If the ball travels 15 meters, what was the average net9ale:qdw/l2r03x;gjzx y0ea jck 52 k force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kin ,r:kf s.nzuc* g6f/ejetic energies and the three following statements. Which of the above c* k gf6eurz/n, f.:sjstatements 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 spi13 j9rz)j,c k+ eqdaleed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest p9ekl,a3 d) qc j1zrij+oint?

  06.20: A boy jumps from rest straight upward from a flat, stationar rujo/rkh7o,8+) o,uhfwl zh+ y concrete surface. The boy, of mass M, leaves the concrete surface with speed v and his center of mass rises a distancew uzrkoho8r+u hlfh,7/o) ,j+ 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. Th6 b8yh6ednz; re 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 cons;hb8n6yr6z d etant force exerted by the ground on the object while coming to rest?

  12.48: An object of mass M is dropped from aheightf1 5vbe3dce/ c 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 net35v/ec b1efdc force acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord lezyw s,r/t vw32ngth L is pulled sideways until the cord makes an anglerv ,zw3sw2y/t
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 upn 9( *u x1wnu5vms.npe a uniform 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 above its starting position and momentarily comes to rest. The sled then slides back down the hill. What is the spu1nxmnn(5swvue * 9. led'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, alo ,jf+t1v jw5zqs8: wgnng 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 deliveryman on the cartons to move tjqf+15wz vn w: gs8,tjhem to the loading dock?

  12.16: A constant force F=8bo pjjwp9 (g;50N (as shown in the figure) 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 t9;opg j8j wbp(he 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 the-0:yw ; zas)eeag 6wur top of a tall tower. Ballg 60e-eaz)s:warw uy; 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 changing?

  11.28: A person throws an o2 ucf/igy, rh)2q fm(dbject 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 ma/ mr,fgd qy 2f2)(hicuss 0.5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 Nhg5qc +r zcvafdpys2q59w--5 stretches a spring that has a spring constant of 20 N/m. The potential energy g95 5svpq5zchf ady--+2wcq r stored in the spring is:

  97.10: A compressed spring has 16 J of pote( d-hez xspbjkk d;wix 1):(d+ntial energy. What is the maximum speed itk1bip w( x( dh-;edkz:)jdxs+ can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bozyk ,k+jp rv.7xcfp3 87sg;oettom 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 n;oz p+gcy3r.,k7skj8 f vxp e7on- zero coefficient of kinetic friction between the incline and the object for both trials.