97.01: A force F directed at an angkbo+ip+v )7g gltm7r0le of θ above the horizontal is used to pull a crate a distance D acros +770l v krgtpib+o)gms a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass1ut)1 *xwwjn f m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by he1t)*nxu1fwwj r hand is

  99.14: A construction laborer (r)ymas1*iq pholds a 20 kilogram sheet of wallboard 3 meter above the floor fo1y()rq*i pma sr 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with unibl(a0e9 : qetw umam(:form acceleration on a horizontal surface for 5.a9lt0mw :e bmau((q:e00 s. The block’s kinetic energy 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 acceleration on a hor*hp +y3 7gagvzizontal surface for 5.00 s. The block’s kinetic energy strictlg ag3zvy+ph*7y 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 kg block 1n )x0 44whxvdbbrx5m1hu b2pfor 5.0 s. The block was initially atdx1hbnx5bwpmv4 )h b 204xru 1 rest and slides 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 rfg 7 t p1ki:9krhn ,q.wph.hb)ight is exerted on a 3.0 kg block for 5.0 s. g7.. 9r q,kifwphnbkh1 tp):h 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 frk9f7i yv ld6yg0+w klr;2 wlv2ozen 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. Whi2;l rdkv 9w+ 2 iwk7lgyfyvl60ch of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour after teri 2o/ .hst-ohe fan has ./i- hot2serobeen 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 l k-ho+snqv g+m: ;7lynq p;5uspeed of 4.0 m/s, and anqqu:- yok +nglp5 7vl;nhs m+; 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 do2a5d9i + nhd8shsxyq:5x6qin the bookroom 1.3 m from the floor. If the janitor relocates the box to thes25hh o iqsx 5ad y+n69:qddx8 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 en4f9,o glvt9oagine delivers 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 acting on the l9foo9 tv4ga ,car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s ath0xu1+z * atv3bu1q:g4 rncmn the bottom of a rough, fixed inclian01gu4vb t:hx+nq3 mcu1rz* ned 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 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 mokw :x ;vi-+;--py4ydq qrlxc uves 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 direct ;+wpxdkx-vi qy;-q :rc4uyl-ly 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 stiqh w9a04 zmwnt):e (f.to.hw arting 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 the same distaaeiqh .w o.ht(n tw4 wm:0)fz9nce F, what is its speed in terms of B?

  12.07: What is the net force acting on the object during the tezjavw(c p *,k-v-y039xmlnnime interval of the accel vz eynp-avjk 3cl(9,-0xmwn*eration?

  12.08: Through what distance does the object move during the time intu5rvde;0; k(o7f4goi.g jay x h+gv0yerval of the aog+.vax;4r o v 70dyf( ukej0h5;ygigcceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is b oi0yyk:yv 81changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What is the change in the kinetic energy oyky0v 1 ybi:8of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energya--zl/t0sai.v x6rbk while its speed is increased from 2.00m/s to 4.00m/s. Which o.tkaxsa06l -/-ib vzr ne 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 he09rs71lhgeoj avy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor andojh7el 1rs0g9 the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force tmohlsss:h)1 cb6; i(j qbr6;and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what conl ;m:( shrhsj)6t c6obi; 1qsbstant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg obje gmw*4vd, kk52 wc1uesct is released 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 mto the ground, whicuv*2de,k14 kw 5wmscgh 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 abovezx abe;e1x*e.mfskq*pl78.7 wt. hk g a hard floor and released. Assuming that the collision with the floor is elastic, which one owp tzqk1sexg; f* *ke.8mb. h77e l.xaf 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 barriebc+) 3f nbzzo.kd, jpje9/m9a r ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force necessary.)e nz b+d c z3mfb,9/ajjpko9 to stop?

  00.26: A 500-gram ball moving at 15 m/s t( kv5.myyb.0ditpu7 slows down uniformly until it stops. If the ball travvdpk 5 t.7yty.(m0ibuels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two labor4 2i,kjtrmdcxp4mb :m rx28e 1atory carts of different masses but identical kinetic energies and the three following statements. rt c8,mpx4rmmx2k ej41:id2bWhich 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 tossedjeso(dnxhv(q8 2rf/24-h l*h ma l bu, vertically in the air with an initial speed of 4.60 m/s. Ignov2j(fa(hh h 2*4umd8xner l, o /-lqsbring 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 from a flat, stationary concrete s)jtw i+1m7tnd.)ogqw urface. 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 avera. godj)m7w) wqn1ti+t ge 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. Th-xke d4 lsafl6(6uv/de 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 averagu(faxl4k d 6-s6 edvl/e 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.rup2 ica./n ag 3yuhuy +:ev-; 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 actirn -eu3uup;/+ hcay:2viy.g ang on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a rr4dbr8 /8ts hcord length L is pulled sideways until the cord makes an anglerhb8/s8rtd 4r
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 incl cmta34 -()ak ajlaj6iv9cn,zine 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 it returns to its origina-ak 3ac4)aj ,iv(6anz ctjlm 9l position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons f,anm3 2vner2kvlc h rf5y 74b*rom the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a massev vn23 57r2y,ba* 4 lmrckhfn 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 figur(tb 9 8t(mx:fv0ii),t uba tk 8ie;xwae) 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 the work don8iv:; 0xtw)(bitftix,(ua e9t am8kb e by the force F onthe box for the motion?

  04.48: Two identical bowlinl0zqz1(gis cxj1* k+q g 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. After ball B is dropped but before +qqxks* zljic(1 0z1g 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 upwarrac r*rn,jl ) 1i92tewajc7 z,d with an initial non-zero speed v. The object rises to a maximum height H a j19nl*7rr)wie2artz,j c,ac bove 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 stretches a spring th1set0hl7w 1 w51l y wrm+ln0fkat has a spring constant of 20 N/m. The pot 0 11w01hm+rl5s7welwy nf kltential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potentialpzpe-,x+dyh:v4w 5 n 9xhww h -o(pb.i energy. What is the maximum speed it can impart to a 2.0-kg objevwd :iwe(x phphxypb,+ 5hw4n-o-z.9 ct ?

  

  10.31: An object of mass M starts from rest at the bottom of a 4/0h f u2 io.wt e9j tyhsjmz oxw/35ai;xh7k+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? Assu i9 ahuo+ktj5ho4wmt ih2w /e;/s .xyx03j7f zme the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.