97.01: A force F directed-sq2ua4zihz9 at an angle of θ above the horizontal is used to pull a crate a distance D across a level floor. The worksa q9-hz2 ziu4 done by the force F is

  97.33: A softball player cati: oumfgov1(6ches a ball of mass m, which is moving toward her with horizontal speed v. Whi6m 1oo(fgu:v ile 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 wallbo1(big8(le ljd pw/a;kard 3 meter above the floor for 4 seconds. During these 4 secondshow mueb8/1l kg(wi ; (adpljch power was expended on the wallboard?

  17.11: A 5.00 kg block slide6q 2yuzlh0f7i s with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decrea2f6z 7 hiy0uqlses 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 uniformm s0k4(xihcn18o qin5 j4wrn9 acceleration on a horizontal surface for 48sk1mr94(hqcnnio5j 0n w ix 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 directed to the right is exerted onr aue 7+ii/b h i6gfj7tzsg*abo+392u a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizont+ob i+ *a6bt2 sj f/a3gi r7zug7uhei9al 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 exerted o 4gdtmdvr oev ;/9 h7npg-8-kbn a 3.0 kg block for 5.0 s. The block was initially avr8hvmb-4 9gn edgokp t7; -/dt rest 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 at re8u -zdzq xm8 a.smv+:jston 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 direction. Which of 8:jd+zam-u8xms. vzq the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kkg7 pm up-b2 ax7.xtpvu7t( (dinetic energy. An hour after the fan hasx.t7bu-dp( 7xg7pukvt2 ap(m been turned 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 of 3.0 m, a spee1zr8 ql9z(eycd of 4.0 m/s, and an acceleration o8(zzq lre y9c1f $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is on,o (jj*t0u9ix wzkdoy w-y ): u6s:esx 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 frzd:eotus*u:xwj(9k x6yj, os y )0i- wom 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 de ec hxanlfn1k:(*p9 /dlivers 24,000 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 actin 1e9n a *f:pxdcnhkl(/g on the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s at the botmjap * xvr. ljhy30t*0tom of a rough, fixed inclined plane. The box slides with constant accelerah 3pxajrvm *y 0*l0jt.tion 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 a;-1z: s8f 7yoxf )gzluluk;hxt the bottom of a rough, fixed inclined plane. The box slidesf;zk7hls1y8:zxu-f l ogxu ;) 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 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, along6yx, f 38n qdlkq)o6ya 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 the same distanc )y6 dyfk8oqqn6,lxa 3e F, what is its speed in terms of B?

  12.07: What is the net force acting on the obj (tr5gd.xitqvw9z3e670 v 7hucuv p+ hect during the time interval of the acceleratidtzu07upxw vvt +.6qvc eh(9g35 7r hion?

  12.08: Through what distance does the object move during tz*u(ukn xj1-a- v sy0lhe time interval of the acceleratio(j -sz* kuynv1ul0x-an

  12.19: The magnitude of the linear momentum of a 4.00 ki joul4hn80vu b;ru 5(a5j fz7g point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a ;of7 8ulr5j hnivub4 a 5uz(j0time 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 increy :*+ bry2n n9czbq7i wo;.cbfased from 2. zyfbrbncwn7io +: .2y b*c;9q00m/s to 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 thef+1th- 7uzcnb horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The co7-1t +fn zhbcuefficient 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 force and delivers a useful poqf 0z zj0d6p2w jo5.grwer output of 0.10 w to raise a block vertically atq0w605jz ogd zf.jr2p 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 the surface of the Ea uus0d6.fi3 ccjo9o)brth, the gravitational force acting on the 1.00 kg object by the Earthio) 6d ou.3j0fub9ccs 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 the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a height ho 0 oj1-mnvf8y vabove 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 above the surface?nvjmof0 81yv-

  07.06: A 500-kg car is moving at 28 m/s. The driver seesunr;8cj)eg8 o:+vu dv a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum averaec):8jn;g 8u uvdovr+ge net force necessary to stop?

  00.26: A 500-gram ball moving 14vso t+;dwoyat 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the averag1v;wt4sd +oyoe net force applied while it was coming to a stop?

  02.26: Consider two laboratok2 l gd z/j43ssre7 2lzthu)7ary carts of different masses but identical kinetic energies and /73gjru2 esaslk 4h7l zz2)dtthe three 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 air with an initial spe,szlbto y.s 0,ed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when s,lbyt,ozs0. it reaches its highest point?

  06.20: A boy jumps from rest straight upwagg,-4gqw*yod rd 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 distance d to the highest point of the motion. How much physical work did the average normaqd* 4 ywgog,-gl 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 a. w8wmoqc r;q5 37gpbabove the ground. The object crashes into some sobw;oq8p gm5.7cq aw3rft 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 constant force exerted by the ground on the object while coming to rest?

  12.48: An object of mass M is dropped from aheight H above the ground. The obpv/9 +hiq 0qnuject 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 on the mass during the collision with thp0+vnuq h qi9/e surface?

  96.38: A pendulum bob mass mon a cord leng * 6ucdrb2k3rpth L is pulled sideways until the cord makes c623 prkr*budan 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 pxjj xq4 ;*gid79 3ioja 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 qi7j4;i j3dxpj9 go *xrest. 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 46,zz(f(h fei/ xt18ra fpwlasidewalk, along 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 f i18(l ah e64x/zftwzrp,fa(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) is applied for ;6pp,yuzb 7q0 xoc+ao(/ cybathe 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 rep /+b(cqp a6yxyo z;op7,aucb0resents 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.55;hnqwozvt9hh -d/ j nag y z(n7qu; from the top of a tall tower qhq vz.w dgy( 7nna 5tohun;;5hj-9/z. 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 changing?

  11.28: A person throws an ob- iajzjgz)*-5a(z bow ;cw9stject of mass M straight upward with an initial non-zero speed v. The object rises to a maximumzjc ) zj-a 95wbgs-(i;w *zato 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 stretchep5yehez w :l*l2 d)goa)9/p wf 1x8koa:gf9fu s a spring that has a spring constant of 20 N/m. The pote9:fpfpedukaxyz9ow158fo*e a:lg ) 2gh lw )/ntial energy stored in the spring is:

  97.10: A compressed spring has 16 J of potenxk.bnp5k v* vc;7e43wx nmb4ntial energy. What is the maximum speed it can impart tokce*mn43v5;kxb 7 . w b4vxnnp a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed inclined7;)mdkz:uw /u jcd m 1iuochgk+*te p .vn:3, 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 coep,.;t3 ekc) *:k7 w/g:ud jmno1mc hudv+uzidfficient of kinetic friction between the incline and the object for both trials.