97.01: A force F directed at an angem o,4sc*el1tle of θ above the horizontal is used to pull a crate a distance D across a level floor. The work done by 41cm to,sel*e the force F is

  97.33: A softball player catches a ball of mass m, which is moving toward her)na 3v)wxwg, mmq0my 0 with horizontal speed v. While bringing the ball to resq m ,m)a00vyw3m)wn gxt, 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 o)p;yi o u7av420 kilogram sheet of wallboard 3 meter above the floor ;piy)ou a7o v4for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform ahz41 0l+lya pmcceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.hp4az0 +m l1yl0 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 5.q:edw h lsbim,*o2xp 1qcoid88x.f uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy 8 pechisl,*8io 1x ow 5dqfqdb..:mx2strictly 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 k 6w1vo 1zripw -r)vg.pbpcd, )g block for 5.0 s. The block was initially at rest and slides on a hor, . 1gib1-ppwo)vp ) zrd6rcwvizontal 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 on tx(ns f5c sb*9a3rne/a 3.0 kg block for 5ern atc 59/s(3*bxsfn.0 s. The block was initially at 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 reston a frictionless frozen pond throws a 1 kg hac k l)/j 54g).fai+yx:.a-h hfo ilinymmer in one direction. After ni-iac .k)xhfi)fhyao/y l5j+ l. g :4the 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 thens e k/w./io in;8il t4z+: .emal6zjb air and gives it kinetic energy. An hour after the fan z.blzsjt ;+n.6 oiae : kweml/48/inihas 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 p bou evg )(r.f3gvt.pvij ,i16osition of 3.0 m, a speed of 4.0 m/s, at .63 re pg)vv(gi1obuvf,.jind 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 thbatt.:o9vs4c0 tu7kg e bookroom 1.3 m from the floor. If the janitor relocates the box to the shelf that 7o:tu9a. ktsv0c4 tbg 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 wzja e4 j0vao;z 44oj g eoq9;xf8syo63atts (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 magnituda 4 y6ofa4ezj e3o xjqog z;40s9o8;vje of the retarding force acting on the car?

  09.13: In the figure to the right, a b3plnzvnfd3k +y77l5x ;tv 0 wsox 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 ofF = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it realkz x707wynvdtn5lfv3 3; +psches 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-t30qlpz37giyw0 ls o.00 m/s at the bottom of a rough, fixed inclined plane. The3w7qis 0 l 0zy-3pgtlo 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 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,tgrzj2pvz1u tj)3.63g b h:aq each starting from rest, along a straight road. CarA has twice the acceleration.g trzz1vjup6g :b) 2h3ja3 tq 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 fogk: 4py ltt+1 j;q3ou+e-euunrce acting on the object during the time interval of the acceleratuy3qet +:k; ol-e4 nu+gu p1jtion?

  12.08: Through what distance does the obj3s lz)/;du4a q ax ;vfvx0;lazect move during the time interval of the acceleratio)d4vza3 ;alf ;x /a ;squlz0xvn

  12.19: The magnitude of the linear m: )* lsjxgwts1 kko8.+rajpb-q9 j(qtomentum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval -rsk jg:kto8. p* )jxl(1asbj9+qwqtof 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 e/siith+ k+c5xc xr/c338ampenergy while its speed is increased from 2.00m/s t3hc+i/r+5 /3sc8em t px xikcao 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 used to pull a heavy sc03pp aid0c c/uitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor and the suitc/pc cp 03da0icase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force and deliveg fu263bcxcb+t09t nm rs a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raise a 0.20 kg blob0 ncmx3 2 btfgt9+uc6ck?

  12.18: A 1.00 kg object is released from rest near the surface of the Earth, th2(t bmd4q1rx ye gravitational force acting on the 1.00 kg object by the Earth does 10.0 J of work on the object as it qrt( y4m12xdb 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 above a hard floor andd qswdy s sugx1: -5laeij+)8 n7m;o(n released. Assuming that the collision with87x (d isnm5- qwo eya;+1:s)ljs ngud 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 bpu0o /-w86lkkquciua43k e (iarrier ahead. If the car takes 95 metp o-0w eul/kcq ki(iu6ka4u38 ers to come to rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball bs)fw(*o;22a c xipgvmoving at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while swp;b2fgci)ax* 2o (vit was coming to a stop?

  02.26: Consider two laboratory carts of different masses but ie -sbf*n(y4of iib p -ageg25.dentical kinetic energi 2-- fb(biognesfay 5ge*p4.ies and the 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 anc k)xiyec1(c:xokq(h ry*ec m3qx:1- initial speed of 4.60 m/s. Ignci co (kx:m3y y rx(1-cqxeeh1 cqk):*oring air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from55wwth jicx9 qo t4yru :e-(6h a flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface with speed v and his cenje 9:5yit u6w5tc-wqhr h (o4xter 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 and the concrete do on the boy?

  02.48: An object of mass M is dro*qrx3epix (e6jq(ul 0 pped from aheightH above the ground. The object crashes into some soft earth and comes to rest by compressing the eart 3 *u6pxrel(x0eq(ji qh 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 massq) +kiw-ibbhv3 xt8;f M is 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 maximum height H/2. What was the magnitude of the average nh;kqv i3)w8 tb-bxi+fet force acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sideways until tsryu xqyqz i+0).3 fgde1y71zocjy 6coi. *l)he cord make+s3lz.*x. y odzo0q)y y i7jfc ry)6u11ceg iqs 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 -yd.9zz/frq cc4.vdx 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 sled's speed when i.d rvdqx./y z-f z49cct returns to its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, aej2t0q* sg ,x vc7+pemlong a 10-meter ramp to a loadin,*qg7c ev jsmxe20p+tg 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 to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is applied wywsxi4l l5m;hi5 (;kfor 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;ki w5sm4(iwx; l5ylh 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 droppjx8dt ,9eb9t ved from rest 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 st9 dbjxv 8tt9,erikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upward with an initial non-uqq b-483be wyvq-f h;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. qu-h v-bbqf3ewq; y4 8In 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 stretchpd5tx ms ysy:;f 7ne/*es a spring that has a spring constant of 20 N/m. The potential energy st e mx/fpstd:*y ;ys5n7ored in the spring is:

  97.10: A compressed spring ha ,6 df* c2x3tqvvg b1ngg7x2rzs 16 J of potential energy. What is the maximum speed it can impart to a 2.0-kg objectbd tnvxr,xc 37gv2 f1qzg*g62 ?

  

  10.31: An object of mass M s,nqdh--g jur5r9ju*k tarts 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 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 jkgh95,j d*r-u-nrqunon- zero coefficient of kinetic friction between the incline and the object for both trials.