97.01: A force F directed at an angl7,qtqm) y m/-,84pxazjgwphue of θ above the horizontal is used to pull a crate a distance D across a levmt,y -mwjq p 4g/7h8xqu)z ap,el floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is moving toward her ng- 66aox8nlcdr;3, y di8psqwxeh9;with horizontal speed v. While bringing the ball to rest, her hand moves back a distancedn q3 e;8-yso n6rgx,px8i69ddcwlh;a . Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer (xhhq ) aml75pjlly+z 9c zr*7holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expal9y7(pcqlm z rxh 7ljz5*h) +ended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizontal s.r*opfpp .-g t.+ln)mz2 lobeurface for 5.00 s. The block’s kinetic energy strictly decr nrpfzo tpell. )+ p*mog.b.2-eases 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 bloc,+9be cb,e; n )stl2e*a lfdsek slides 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 inneet+29 , lac)es bf ;es*,bdl 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 directe jsqu 8px55u 6bhvv2v9d to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at restv85 5x vqs9 u6pu2vhbj 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 3.00h : nx3m- m4ix6hifwg kg block for 5.0 s. The block was initially a:6 -3h04xmnm xfighw it 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 pony0i4q 1wkl z8mof:(pqd 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 c(81l kmq 0w:pyoif qz4orrectly describes the above situation?

  03.14: A fan blows the air anal7 pj1mvoc-o t0yit2c5n;(w en 6m0g d gives it kinetic energy. An hour after the fan has been turned of(5an20n 7vomt60iwlympt ej-;co g 1cf,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 eb8j:bkpt yh)c8qnv iy d456n d581bckg has a position of 3.0 m, a speed of 4.0 m/s, and an accelypb5td8k6jcb1d:e8h4vb i 8 n) y5cqn eration 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 the6p l;lja,fsh*2k*wre jonm* 4 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*jk*jw6lo*s, alh2fe ; pm 4nr do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (abou*h4f hh )fma(ut 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65h*umh (f4 ah)f mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box moves with speed 5.0085z9 c7u3ov ;7 h eru:fz4b)fj ttjop -qcwz+h 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 w;c5eztz u47 jq+3zvhcorb7 )ouf- 9t8:hpjfly 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 moves with svtd t h(fu2 o3d uvu6ns(el;z1zyc3ll 28z9.apeed 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 of F = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the top of tla9 y2 ve(znufouzvtc8;6ul.dld3 h s32z1( 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,nlthd68*gmk3bp0oc h ;f u47a 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 di;ol7utn kh864g b0ph*mcda 3fstance F, what is its speed in terms of B?

  12.07: What is the net force actinj00s6kn4l w/sz0kkx1b 8rc4 ppy qz(kg on the object during the time interval of the acceqk (z 8kck/r4 06jx1y0psbn4p0kzsw lleration?

  12.08: Through what distance does the object move during theing:g3.,t , i*ucd kyj time interval of the accelerat y,cn. tdgkig*3,uij:ion

  12.19: The magnitude of the linear momentum of a d0/y-mwlk6 aj b-9.s/fjc m ts4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 0-.9sl jwy at f-mmd /sjk6bc/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 increa,j63 ;lt4r 0vbggoypx sed from 2.00m/s to 4.00m/s. Which one of the following choices best represents the ma p 3vb6jt;golxr gy04,ss of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull a heahqccuf7 t6+2 lvy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor and the suitcase ith c cqul7f2+6s μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force and delivers a usefdg91hx 1 z.bhpul power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raise a 0.20 kg bl19zg x. dbhhp1ock?

  12.18: A 1.00 kg object is released from rest near the surface of the Eart.2u:/mww. /fisxlho ih, the gravitational force acting on the 1:.omxhw 2.wi/fu li/ s.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 above a hardu k+ m qkwt.nd.-43*fl w-y pxxy+wkt8 floor and released. Assuming that the collision with the y +tfl md-xxwky- .3kwp8nkt. u+wq4* 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 surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barrier / tib(bdo1irgomf 78* ahead. If the car takes 95 meters to come to rest, what is the magnitud/idf7t(oo8*bib rm g1 e of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows dowuc)v 0ov7.m mon uniformly until it stops. If the ball travu. )c0o mvv7moels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masseshd6i xt1v l x7 raa/y26/xldf6 but identical kinetic energies and the thret7l dlhi2 ax xarx/dfvy 66/61e 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 tossexs 7jft3w 29kld vertically in the air with an initial speed of 4.60 m/s. Ignoring air ress w3kf j2ltx79istance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward jd 1pbw:kd7 l,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 wl:17b p,jkd dto 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.)/ljgvj as)..-nru-d j + sedd 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 constant fon l).udd svg /)asj--jje+.rd rce exerted by the ground on the object while coming to rest?

  12.48: An object of mass M is dropped frokh;x. c1+lj anaac8r/m 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 during therx .c +h1 nlc/aak;ja8 collision with the surface?

  96.38: A pendulum bob mass mon ak ;bi2ca/ivg 8ks8n; q7n,iza cord length L is pulled sideways until the cord ab /ivi8 ,;a2iqc sz nkkng;78makes 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, which z-9q :+fpqa g 9*vhi e/esxh0g started at the bottom of the incline moving at 10.0 m/s, rises to a height of 3.30 m above its starting pof p iz9x0e q *qhgvg-a:e9+hs/sition 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 13gn0vd/lxxrg6q+.6tm l 3a tc0 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 thed ga6/3 .mlc+l3nx0 rt6tgvqx deliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is applied for twm7(:2b dbfxb l sro(s (f7rf8he 6.0 meter mfbr2mdl:(roxb bfw(7( f 8s7 sotion 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 box for the motion?

  04.48: Two identical bowling balls A and B are eachzmcl*v 9t3/bfyj,c,jt 6q ho- dropped from rest from the top of a tall tower. Ball A is dropped one second before ball B. After ball By, 3z mb6c/jfc vjqt,*t 9o-hl 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 au2) dnlf43ysbm,w : fM 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 the launch point? Ignore ai32m swf ),b l:n4duafyr resistance.

  96.20: A force of 10 N stretches a spring thatsihu1vhnjk 4kq54 l 6, has a spring constant of 20 N/m. The potential energy,nk u1qk ihj4v5hs l64 stored in the spring is:

  97.10: A compressed spring has nm5hgkx f)1; y16 J of potential energy. What is the maximum speed it can impart tyk; ngm) 1hfx5o a 2.0-kg object ?

  

  10.31: An object of mass M starts f(( yof6sa*a gjez-iq .b2xq9srom rest at the bottom of a 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 com*9ajz2b(sig -qas.(xq fo6yepare for the two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.