97.01: A force F directed at an angle of θ above the horizontal is us*qa ;hi hthgna24pfes8 *:g-nrw1 th/ed to pull/:hwghn n4-; fapth*18*a qg2serthi a crate a distance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is moving towg- nb 78;1ckamuw7jp fc pk05qard her with horizontal speed v. While bringing the ball to restqugn7 bp j 7w85pf0 m1kcca;-k, 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 gd. ntucs6a2 :20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power wass6.dtu:2c a ng expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a h7-sc8;ox kv 3i aqn,yworizontal surface for 5.00 s. The block’s kinetic energy stricti-8n s 7a w3q;ckxo,yvly 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 unifob -fxe,x+k3doyb f3;fose5 v/rm acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J3 d53o efb/y xs-xfok+,vf;b e 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 kf0-u,4ugqz a ofdo d 5q:6m4ekg block for 5.0 s. The block was initially at rest and slides on a horizontal surfauk4oo e0,q:54dq uff-6gm a zdce.
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 om5tbdxm/(g2 i 58kmwvx -pfr2n a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surfacx-b2kg2/ 5tw m5mv8di mprf( xe.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a frittr-e**qrtz +ctionless frozen 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. Which of the following correctly describes the above situatiorrtt*te*+- qzn?

  03.14: A fan blows the air and gives it v qa)i:5ldi vm)v3z6bem rw9-)a m q,wkinetic energy. An hour after the fanw)q:b 5zm a3,-vvrlv e6q )iadmiw9m) 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 poa6:n-brn m h-usition of 3.0 m, a speed of 4.0 m/s, and an acceleration ofhr m-- nanu:6b $1.0\; m/s^{2}$ . 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 m from u/ kl1:zt nd*fthe 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 box. The box has a mass otzdl :*k1un/ ff 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (a8tf fvz/2i b(8r0tri 7jebuobv1 e) +gbout 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 of8i+)go be rtfzr j12(b08fv/7buvte i the retarding force acting on the car?

  09.13: In the figure to tast) p j41d4nhhe 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 being pushed directly to the left with a constant force ofF = 240N. The box, of mass m= 20.0 kg, hap ja4nt)4 d1shs 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 wnzptcx4t c5)1sx +7 ixith speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The bo ) xc7+5xx4tc1snpi tzx 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 thei5d:maw4 ) v kvjnwd29 right, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. k9n:4dv jv d2iw mw)5a 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 ob2rpy(y.r/ ojr8x lm;etx 8c: wject during the time interval of the accpx8/jxw r;rm8yylc2(:or . et eleration?

  12.08: Through what distance does the object move during the time interval gan/yai1w hu/mq *v 9o-rc4) mts/9t jof the acc/* juqc4)a9 i/ o t1-tyvwmr s/g9hmaneleration

  12.19: The magnitude of the linear momentum of a 4.00 kg poinn/c:we cyj(higq i g94qlv8 1q 2epi.9t mass is changed from 6.00kg.m/s to 14.0k1j2:vypliq4q9 8.9q cei gwe/ngihc(g.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 speed is increased8k0pl (ioukl0 orn n4; from 2. l0np0 4krkooui8;(ln 00m/s to 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 isy z9mf2 fa ,ekv)6fe-a used to pull a heavy suitcase of weight mga distance d along a level floor at constant veloc,vef)a29-effza mky 6ity. 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 4rhas(ht im:*output of 0.10 w to raise a block vertically at a constant speed. At what ch*sma:i4h tr (onstant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of the El; 5vlzvx4hnx; 5q cv3arth, 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, which one of the following choices best represents the amount of work done by the gravitational force acting on4nl5;xvlh x53qc v ;vz 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 and rel2-c8 oxmptzq; (rg/ag eased. Assuming that the collision with 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 / r(-;g x82paoqcmztg surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver ;vxy3ip e :kpp2q2lkjvd /63wsees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the jy ek23q;2kpdvw 6p/:lxpi3vminimum average net force necessary to stop?

  00.26: A 500-gram ba (ztd5ue:fv mfyvb 7a47y*,n kll moving at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the averfk4u y:ted vfv,* 5y b(mz7an7age net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of differen0y6)4 l2ot xrhqls bz9t masses but identical kinetic energies and the three following state6yt4l 0so)lzh brq92xments. 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 oi8p0xid0*fo42q 8o 5 saauf a3xmnva+f clay is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest point f+* oaiaaup3do4ifx0vxqnsm285 a8 0?

  06.20: A boy jumps from rest straight upward froowlbzbrlu6:v5s o 8ea+:pn ( x ,i.a)tm a flat, stationary concrete surface. The bwi:lpz(su+l bv :8beo, aa )orxt. 65noy, 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 concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH above the ground. n1*j6nd da6d.9 b uxrsThe 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 constant force exerted by the ground on9s adur.jdn1b*dx6 n6 the object while coming to rest?

  12.48: An object of mass M is hjyub u-h(hj3c vz; *8dropped 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 heigvcy-bhuz3*hu; 8 j(h jht 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 sideways until theefo05;3whadb e6h s .b cord maka6whdhef0.3 ob seb 5;es 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 incline of unknown angle. The sled, whcorq cz ,s7o: -6*zygcai4 9xlich 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 original position at the bottom of the hil*az679iosocr,y g4ql -z :ccx l?

  06.09: A deliveryman moves 10 cartons fromyz o ax(evcy/gj t/,nu7 l.s4: the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each:xtv(louy4zy.7s j a/g/ce n, 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) ishuu u *cj5+p7z :qa8koqo6jc3 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 done by the force F onthe boq*pc 3h 6:cqo58au +ku7 juojzx for the motion?

  04.48: Two identical bowling balls A and B are each droppe rto gj ga41to3bj*0-zd 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 strikes the r j1*3oa ob- ttgg4zj0ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upward with an (fgud6t f,awir,2 oo1initial 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 wo awt 6iurdf(g2,o, 1fhat 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 that has 6*i1 o ve)ga qmwul 5k1, -njti0guhr9a spring constant of 20 N/m. The potential energy stored in the spring irlw*qa1jitk)i,g o9ghneu1 0u- 5m 6v s:

  97.10: A compressed spring has 16 yb8c23e)f lo7*bizl am+d my0J of potential energy. What is the maximum speed 3aemm 7olf yb)0yz bld+82*ciit can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixal110pp 1jl gbp+(vwsed 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 ijvpb0s1pll1 (gap w+1ncline 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.