97.01: A force F directed at an angle 8le2mx nl5k21qi u-edd0 rw6fof θ above the horizontal is used to pull a crate a distance D across a level floor. The work done by the force F is8k1idefx n062 -rql2wmeld u5

  97.33: A softball player catches a ball of mass m, which is movinghwpb0oh3 vabh(mrjbe1 a7ct-/ t73fk:n nv)3 toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exemw ftbhva1pc- )jh btka03 73/37vn:h (e orbnrted on the ball by her hand is

  99.14: A construction laborer holds a 20 mm.b d7jd83bskilogram sheet of wallboard 3 meter above the floor for8d7mj.mbsb d3 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with unif m74 0x:zmm(ncwlbn2 borm acceleration on a horizontal surface for 5.00 s. The block’s kinetic enewmmb b40c2:7 nnm z(xlrgy 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 slides9wc4oy c o5ko37nt mp;lkf54b with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy4ccnft ;4b3kokly7 oo55 m 9pw 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 th,mzic 1.ohm9)i pau6ne right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontim)mh 6aucnp zi91.o ,al 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 exert. dd88(rw-n.nfli aq ied on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on 8w8id - q(.lrfn da.ina horizontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initia-nywe;3b4 tyb) p,ebu lly at reston 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 of4;tu y ybeew,-p3bnb) f 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. An hour aftedevl36h*qv ;gb. 4x zzr the fan has bee g4dzh3;*vzeq lb xv6.n turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a blocp tv 1wl7,aoj5k of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an 517ajv ,owlptacceleration 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 the bookroom 1.3 +ua tjfxx.. c v:ond/(m from the floor. If the janitor relocates the box to the axf u:c+/vo jdtx.n.( 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 lwi lt4 ay*at99 qki1 3y4aqv3horsepower) of power to a car's driving wheels. If the vt*w1y49 yl ikqt34 qaa9al3 icar maintains a 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 thi2p /dosrg *7he 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 bdpgi2ho7s / *reing 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, h-j971rpkajf* mc /ih 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 directly to the left with a coj7*i9mha- krch jf1/pnstant 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, eaan yf6ur tujv ;xca27y., 3h+wch starting from rest, along a straight road. CarA has tw,tj;2 xua h.ayy 36wr7c ufv+nice the acceleration 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 force acting on the object during the time g:*bx (vwd6vc:y o bjs1e (5h3 ib,otlinterval of the accejbs(l:,btv xi 3o 6 c1*v d(ebgo:5hywleration?

  12.08: Through what distance does the object move during the time interval of tbulfinsihd,66y0v+ jz 795w r he wn,7v hirldujs 6+yf69z0 i b5acceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is changed/87q3.u tane,rdpdn d from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s, ade/dn8pdt3r.unq 7. What is the change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of 4)dq;hm0)y ds8qvphrkinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the followp sq ;)4mr)vd0hhd8 yqing choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull a7)kfwbaz7f- fl-.z ey heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of -bzwf 7 y)afzf.lk-7e 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 delive4mo rn41 n vrd.pl,hr1rs a useful power output of 0.10 w to raise a block vertically at a constant speed. At what consv hmrl.r1po4nr 4 1,dntant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is relef *:.ea+tvouaased from rest near the surface of the Earth, the gravitational force acting on the 1.00 kg object by the Earua* a:ev+fot.th 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 above a haecrr 7 jvstj:w0h.1d/rd floor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relationshipw jv r7:j0h/rct ds.e1 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 driver4c* x k/l w*w697+nq benm)rauca,dg o sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force noxle *wncq /+967amb u, wk acdgn)r4*ecessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it stopof4ef-) bx;kf s. If the ball travels 15 meters, what was the average net force ap-ef;of4b )fx kplied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but +wt um6 e)78b7fzgjnpidentical kinetic energies and thefn pew u 6t77)b8z+jmg 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 initi(p+v zz h*)tbwfnxa,(al speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest wtvh(+*,) azb pf nzx(point?

  06.20: A boy jumps from rest straight upw/ :v uq.b7m:eraqbv,aard 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 physicalbvvq7qmrabe,a u: ./ : 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 ma-xd/ vgtw 9u: iryxf-wl:(k( css M is dropped from aheightH above the ground. The 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, wha/(c-w:lv:tgr x 9wy(k-fux di t 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 ;r*e: sl;iy zafrom 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 net force acting on the mass duringasz riyl:;; *e the collision with the surface?

  96.38: A pendulum bob mas,ifi dus m8hji pg1)25bis(b0 s mon a cord length L is pulled sideways until the cord makes an an pb2 d5sb(ifihi8j,im1sg0u )gle
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 do0g.1y 4lsnerzdd0gty -k +2up a uniform incline of unknown angle. The sled, which started at th0+yld2d -4dgg.e kt01ynosz re 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 carto;mi6bmt-,s 0y*fccvvns from the sidewalk, 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 the total work done by the deliveryman on the cartons to move them to the loading dock?ys-b; vc,tc6f v0imm*

  12.16: A constant force F=50N (as shown in jw/gcqxj)6n70d lb os8gv)el9o p92uthe figure) is applied for the 6.0 meter motion of the box upward along the incline. The mass of tv o89q )6won sbcxgge 29)pl07luj/jd he 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 rest from tblb q4fl(r*3g he top of a tall tower. Ball A is dropped one second before ball B. After 3(rfl qbb4 *glball 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 object of mass M straight upward with an initial non-(ps+8ma6z k2si8so. h o j+cjezero speed v. The object rises to a maximum height H ijs. 6 mpo2sj+ ok(ez8sha8+cabove 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 b+9 b ijqpobw6c17f2y stretches a spring that has a spring constant of 20 N/m. Thbi +yj1762pbw9qfc boe potential energy stored in the spring is:

  97.10: A compressed spring has 16 J mlf*/ao ksdqda /yl-wk(4+* c9 j: ipgof potential energy. What is the maximum speed it can impart+f*kcgljom:-p/s y 9*i/aakw4d d lq( to a 2.0-kg object ?

  

  10.31: An object of mt8giz y)p;q3fgs69e k ass M starts from rest at the bottom of a fixed incline of height H. A person decides to push the objfgq)8 ; tys3i kep96gzect 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.