97.01: A force F directed at an angle of θ above the horiz f*77nc (jiilzz 6v1soxcir2 4ontal is used to pull a crate a distance D across a level floor. The work done by the f(1crzcii27 i6v *loz7n x jfs4orce F is

  97.33: A softball player catches a ball of mass m, which*1b.yd vxtrf -uhu ,c6 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 ,h6y.1dcut xfr*-ubv her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallbo kxpo 8go17bts h+t1h; 9x.uwvard 3 meter above the floor for 4 sbs.tt xx+gou8k hwo1;19v7p heconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block :ws,jhfai2 od8:* zbh slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy swi dahh,z o8jfs* 2::btrictly 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 slid g 3f8tc,ufh4u3linqiuns2 ,/es with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this time. ,qu /suincnl,gf3h 284f3 t ui
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 onmgxh g g;t-2myz q w5,8f)z7irw9c rx+ a 3.0 kg block for 5.0 s. The block was init7; 9ggz5 r8x-h,m) xrm+wwq2iygzcftially at 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 right is exerted on a 3.0 kg block fort6xige3f-yoo(zhv ee*1uc* d/dh c 70 5.0 s. The block was initially at rest an* e (uyh cfd1xgh-3 o7o60/eci* devztd 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 hvwc l8/6o /cmmammer in one direction. After the throw, the hammer moves off in o 8cvwom mc/l6/ne 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 gi t nezxh )s3 bp*4n5:clh8dh5ives it kinetic energy. An hour after the fan has been 4:n3c8zl hst)* de hxhp5n5ibturned 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 h99i2dj4 cm iqjb.8fkosition of 3.0 m, a speed of 4.0 m/s, and 4h8cj2 9kqfjdb .ii 9man 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 t/zv) iaa:)8ebmr 0 ie)k ufwp3he bookroom 1.3 m from the floor. If the janitor relocates the box to the shelf that is 2.6 m from the floor, how much work does he do on the b) ))am:weapf rk8 izbiv0eu/3ox. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts cc.+ys8 *vw. lptuk9otz4r c7(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 tpu .4+ yotc*s 879ckzcl.rvwt he car?

  09.13: In the figure to the right, a box q.;idk-hr3vqmfa+ 0j moves with speed 5.00 m/s at the bottom of a rough, fixed .v0h+ -k mjidf;3qqar 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 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 thed;fp phd8wc+ ;9ewy 0b right, a box moves with speed 5.00 m/s at the bottom of a rougp by hefw c98+;0wd;dph, 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 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, along a straighv x,3y*/:isnwf x.cbdt road. CarA has twice the acceleration of Car B. After traveling a di.b/xxiywc s,v*:n df3stance 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 be pp+ zmkn;,0o wkn8-force acting on the object during the time interval of the accelwkme,p+;0 noz-nbk 8peration?

  12.08: Through what distana3xcjxb) ge *9-zy w8fce does the object move during the time interval of the *bxe)xa-wg 8j cz f3y9acceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg 1.o7f+rag cepm+ 3 xb k5lb// lesrk:ypoint mass is changed from x1l o /cl/pkkar m5e .r+s:+7ygfe3bb6.00kg.m/s 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 energd): aa+kips/p 0srt3g y while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents ths/g )a+pdar3kpst :i0e mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull a hec hh4ih6 5o2lipn bc)/avy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor and the s56ncch /hib2lh4 o)ip uitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force a; d;be+, sm1kk:f-udc,bff;m vs1tl e nd delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constans, 1du 1e +;vsfmbek:kfmbt,-df l;c;t speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from resta2+qwb95hyrr9 y0 fjcorx7 pg (v p-ebw97p9x near the surface of the Earth, the gravitational force acting on the r9eafcb-(9x p7vywp 2rwh75yrgjo + 0xbp 9q91.00 kg object by the Earth 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 abov8.2yyn3c-vfca nqtyyy ) q 91le a hard floor and released. Assuming that the collision with the fly1-cfc tn )q yyy.yq28vn39aloor 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 )ffack ge:.-t,geibs:ow, -o7c9 gpd driver sees a barrier ahead. If the car takes 95 meters to come to rt9ico-ke7wg c-fgbo.gpf ,: d: s, e)aest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows dou1;. 6yi gcpiegd6 o mk9pl ,l (:gcx0:ewq5xown uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was comi;0o wx5, m cxg.:9y1puqeigoc ge6pl6dl:i( k ng to a stop?

  02.26: Consider two laboratory carts of different masses but if6c5 27izq7mjvyy l/c dentical kinetic energies and the three following statements. Whizy57yl2 7 fijvc6cmq /ch 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 tosse:o5yh2sz3x8s4 jkm bmd vertically in the air with an initial speed os5x2hbzm4jsm: k8 yo3f 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from re n ,d3-m0)idsaipr+ szst straight upward 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 normal force of contact (N) between the boy’ s feet and the 0 +ra)iz ,- ip3nsdmdsconcrete do on the boy?

  02.48: An object of mass M is dropped from aheightH above the ff*zw *c+o szb)b4 ,dsground. 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, what is the magnitude of the average constasf c4wszbo,f +dbz)**nt force exerted by the ground on the object while coming to rest?

  12.48: An object of mass M n5bbsz/we7p:2b i9mu is dropped from aheight H above the ground. The object bounces off of a horizontal surface in a collision lasting time Tu n9:iwb27be5mzp/bs. 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 the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled side3 hnq cp.d1 n)1:fvbjs*s vjm4ways until the cord makes an angle 4vhmq)nj 13p*jbvn:sdf.1 s c
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 incline of unknown angle. The sled/80zl: svrng- )xmuun , which started at the x 0zsn-)/ug 8l:nvmru 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 m(9x/mzffq03):j; k by /t9ttb ubobn koves 10 cartons 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 m)z 9f m 9obbf 3 n0tb;tbq//j(k:uktyxove them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is applied for thme 3)ig3a3oi -;dhbnje 6.0 meter motion of the box upward along the 3ei-3dah3mbjoi ; )ngincline. 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 bowling ballt2f:sny 7v7pl/w5x6 g 9xl hkcs A and B are each dropped from rest from the top of a tall tower. Ball A is dw95 vn7kg:h76yxtsf p2lc /lxropped 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 object of mass M straight upwar7w vsgj4bs.0wd with an initial non-zero speed v. The object rises to a maximum height H above the launch point. The person now throws wj s04 sb.7gvwan 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,;namlq3h) :b6zrad w stretches a spring that has a spring constant of 20 N/m. The potential energyb)w;dazm 3lr h 6n,qa: stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the m0sobe7 po,eb: 2ed5myniymezx+8-i-aximum speed it can impart,0ex5-:ym- z o p8emb7b+eoiyids 2e n to a 2.0-kg object ?

  

  10.31: An object of mass M stqqz .am(t* bh,arts from rest at the bottom of a fixed incline of height H. A person decides to pt* b( h.qa,zmqush 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.