97.01: A force F directed at an angle of θ above the horizontal is used to ud) o/em cku9:pull a crate a distance D across a level fuko /9edcu:) mloor. The work done by the force F is

  97.33: A softball player catches a ball of mas*7z ;gmg t0er1z fqwa+s m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a dist ez7fmtrzwg q; g*01+aanced. 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 wallboard 3 meter abo.)b7nk awtyt 2ve the floor for 4 seconds. During these 4 secondshow much power was expended on thewtb ytak).n72 wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a hori )h8n wh q5e;b/lbdt2yzontal surface for 5.00 s. The block’s kinetic ene 8 /qd;tyb)e bhl2nhw5rgy 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 ,wvw: pxelg4 - )p/gfdbi 87cowith uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decr)ww /8ge:gfc xilpbv, p4-od7eases 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 block foxj 5vc7nz0- 9hs:peawof z/5 tr 5.0 s. The block was initially at rest and sl7w95:ce zjvzh -5as/ n0tpfxoides 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 exol2uh1r9j 5cqerted on a 3.0 kg block for 5.0 s. The block ulq 52 ohj91crwas 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 rv:r vxnw 6z ur*n)m1 pgh:8+dkg hamm grvvh d :zwr6upmn8*r+: 1)xner in 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 and gives it kinetic energyn(soy:bb6; xdu7aik n- ew.fpr h(l9 s4viu//. An hour after the fanb b hsp;ndaw l. 7y (/ox(uvirfekn-ui4:9s/6 has 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 3q 0jjtle0p zbd s8jk qb( ):wlivs.*6,.0 m, a speed of 4.0 m/s, a s8b6pqt) 0 dq*,:lvlszjweb. jj(i0k nd an acceleration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old t:uqai/gbu /zk ,jy:r* extbooks is on the middle shelf in the bookroom 1.3 m from the floor. If the janitor relocates the box ta*y:/kb/gui:, zjrquo 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 horsepowex sg0+5vow th vvh5y:;r) of power to a car's driving wheels. If the car maintains a;o s0wvy:5gxvhv +5th constant 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 boa alyo+oug)ca80 mx2t5g0b8nyuuf . 4x 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. Thecx+ oub0au4y n5ft0m o8)uy ag.ag82l 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 hbsl t,zebze*mp797eb7* bd0 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 etz*sb7eh zeb*7bb9dl,0mp7 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, obh7.,f7 19e+y tjt/ov gilcxeach starting from rest, along a straight road. CarA has twice the acceleration ov+o/ej9f71 x gbit,hcty o l.7f 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 actingkv(x :n 4p qf8lick5qko-u,0i on the object during the time interval of tqvil8o ku05c:( nx , i-fpkkq4he acceleration?

  12.08: Through what distance does the object move during the tim 0y *tekya)cm4e interval of the accm4 kce*ytya)0eleration

  12.19: The magnitude (vz bztc5u3l 2of the linear momentum of a 4.00 kg point mass is changed from 6.00kg.m/svul5( 3z bz2tc to 14.0kg.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 of kinetic energy while its sp e4x +xhc.hbj0eed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best representsxhb 4c j0e+xh. the mass of the crate

  94.38: A force F at an angle θ above the horizovoh8 rxtg7 ck-q5y9-pt*5 lvmntal is used to pull a heavy suitca cgvqp 7xrm-*v8-tkh59l 5y tose 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 the frictional force is:

  14.31: A toy crane exerts an upward force and delivers a useful power output ez j2-e:5prfkqpzoxi sy921-wf6 /dz of 0.10 w to raise a block vertically at a constard5izxf2z1 -ow /:jq6 pkps9e2ye-z fnt speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is reu tw01e)a8 rwileased 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 mtoitw)0ur8a 1w e 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 heig9h4z hf6 ,(g7vewqyvjht 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 energ ,97jzvwqg46v y( ehfhy 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 barrier al45zqqah7c3;f0 a lanhead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum h53zaaq4ll nc;a 7 f0qaverage net force necessary to stop?

  00.26: A 500-gram ball movi4fzg 9c l64 *mdmbhq4vng at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while i94mdf 4*46qbglz mvhc t was coming to a stop?

  02.26: Consider two laboratory carts of different masses bmuxyqn ,sr 9 (hj2sb1 48lzs/dut identical kinetic energihzs 9/sr1uj (2 nmldy8,bx4qses 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 jp5* zu .9cxs:iy)hawthe air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reasu zi9) wxh*cp5 aj:y.ches its highest point?

  06.20: A boy jumps from rest straight upward from a flatq9g ub+t n(7tt, 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 and the cont(79 t bqt+ugncrete do on the boy?

  02.48: An object of mass Mbws); (ne)a)lxux l8h is dropped from aheightH above the ground. The object crashes into some x(b;lule ha ))ns )w8xsoft 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 oto:2.3 67/j oxvwqzbz3f)i7fyleij nbject 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 cz i7j7 3ovq:wx)i/. yf2 oze63tb flnjollision with the surface?

  96.38: A pendulum bob mass mon a cord length L is -f n(k-f8cjsx(cr 9gpzn6 b2ipulled sideways until the cord makes an fpnc i29cnfs z (-rxj6kbg(8- 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 uxgc, mpk--fl0 j0h9al niform 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 whe--aj 0p xl9gmh,kc0lfn it returns to its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 10-meter ramp . qg-t/t(tb(l;bljk pto 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 thetj-l;tb bqpg .(l /tk( cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is a8oig+/q5;p r c avgf.vpplied for the 6.0 meter motion of the box upg+v;ci8ofa /qp gvr. 5ward 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 motion?

  04.48: Two identical bowk8by ysw,xx+k- pd32 wy2-a9)y nrropling balls A and B are each dropped from rest from the top of a tall tower. Ball A is dropped one second before ball B. Afte ,xwrypn 2ak xy-wyd+b8oyp9r 2)3k-sr 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 obj7 q-ld h;2yiv9:zwunaw nf-p*ect 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 mass 0.5M rise above t 2qa-*9l whi;-ny 7nw vzd:pfuhe launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring f c-p wx6xac6qk5lb0)ppc;o. that has a spring constant of 20 N/m. The potential energy stored in the spring i l5f-); qkwp6.xab 0pcco cpx6s:

  97.10: A compressed -x/u ee r7ob:xspring has 16 J of potential energy. What is the maximum speed it can impartb:orex7xue/- to a 2.0-kg object ?

  

  10.31: An object of mass M starts from resh2 il 148yl5es noizr3t at the bottom of a fixed incline of height H. nr e813 i2 4sllzyih5oA 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 kinetic friction between the incline and the object for both trials.