97.01: A force F directed at an angle ofcngu zi+/b-(f θ above the horizontal is used to pulzfcig (- nu/+bl 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 2yjc8d :5 lal9ajaz2itoward her with horizontal speed v. While bringing the ball to rest, her hand moves back a dis2jaza5y9 l2 ijcd:a 8ltanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer hoanbq/ +x(acfr0/2 cd*z4c gg qlds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondqf(g+acad02qx/b4cn zr*/ gcshow much power was expended on the wallboard?

  17.11: A 5.00 kg block np;v.tvbf ,e,hg5(k.i rba,u slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic en,p;b5( .f,vg,iahub tk rv.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 ho0+m3w1 li qs 1maatwj-rizontal surface for 5.00 s. The block’s kinetic em-a0w s+1lt1i3amw jq nergy 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 t iork-sad+w3nxz. 8 rd2y) m5wb11auuo the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horm. 8)s1w iru5 dn-aawx2yzukb+d13orizontal surface.
What is the speed of the block at the end of the 5.0 interval?

  16.12: A 12.0 N net forc 51bbp*w4 p0zxl+ubvk e directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal su bp+wvk*b45 b0zxpl 1urface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a frict0sqbcn/t/ pgv e s43r(ionless 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 diesv// p0bs( r3c4gnqtrection. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic2nm 5lqd n:eg-r,yg1c .kd +ah5ive t- energy. An hour after the fan has been turned og vgrnl ia1-de+,:5ycd.e2 m k-t5nhq ff,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0m jjmw4jg/6*ezfk 3 suf,4*wr+ km: di.50 kg has a position of 3.0 m, a speed of 4.0 m/s, ans:jdf4,ejj6 +kiw3z*w */gumkfm4 rmd an 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 middl.b( 7 9ukaaduxe shelf in the 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 mua bx.u7a9udk (ch 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 320thzo-ys+ ao1c, b 0gxlos4;j 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 act 0b1;osjs-gzyh, ot0x4a o+c ling on the car?

  09.13: In the figure to the right, a box moves with speed 5.0+t04rppl zt,n d(6hdq0 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. Th6 zd4 phl,t0rq ptd+n(e 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 spanp-jly--fl jp 7hq,voaj88 - eed 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, ha7,ahynjl v --8p8afqp oj -l-js 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 righ;nkqd*9hpgl3(d:h 9n5j tl yzt, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car ldl:pz* nqd5nhh9ty9k(gj ;3A 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 ahzij.fzm3 (52mq( gaon the object during the time interval of the acceleratio3zzhfm5q. gamjai 2(( n?

  12.08: Through what dis y)./ :cq*trhqex4(cxv ok 5zftance does the object move during the time interval of the a zq(qx t5rkcvfo*.4 x)hc:e/ycceleration

  12.19: The magnitude of the liy9:ab a .mdma7 h)qb,.gyct/wnear momentum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14:,d.7/.bgy )ta h9ymcawmq ba .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 kinetio8u7sorue9c+zm n,jz (,2oi nc energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best r(scj+7, n eiuonzm8 oo u9z2,represents the mass of the crate

  94.38: A force F at an angle θ above t 4bfg2l:x:gi buw12f vhe horizontal is used to pull a heavy suitcase of weight mga distancg1uwgi2fbf2 :: xblv4 e d along a level floor at constant velocity. 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 - (ek: d3 ztzfv/gi2icavqb 07power output of 0.10 w to raise a block vertically at a (z e0 i-dc k27fvavtq/g ibz3:constant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rsbf 4 fq,o63fe g0zv60jra3 fvest near the surface of the Earth, the gravitational ffeg v fqa 04o 03z3v,fb6js6frorce 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 on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless f8 2vtzne s bk7f16p)z)fw:56winqi na height ho above a hard floor and released. Assuming that the collision with the floor is elastic, which f nfz2qpvs:kf e 5)ni it w)z8nbw6716one 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 dw:hvwro-8v1 g river sees a barrier ahead. If the car takes 95 meters tor1o h8w v:v-gw come to rest, 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 down unifoof6 x 18r1j/ ij.swxmnrmly until it stops. If the ball tran /1om6xjj8x f.i1 wsrvels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kinetick0;l,eybbkduom; k *h g5a.o1 energies and the three followi,o ey0odl;uh 5;kk agb1 k.*mbng 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-kgballl/9;amv /zhlx of clay is tossed vertically in the air with an initial speed of z/9 vl;/mxa lh4.60 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 rest 8/ nhg pcjn;1d7nbcnosda6c0+ l4kx)z hs,k *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 t80 g, 6 sj/c)ha1hczlx c on4ndb d*;kn7psnk+he concrete do on the boy?

  02.48: An object of mass M is dr-zlrx 7yh(vc6 opped from aheightH above the ground. The object crashes into some sofr x 67-zylc(vht 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 on the object while coming to rest?

  12.48: An object of mass M is dropped from aheight H abwi qo 9tw *hj-+d5hz:cove the ground. The object bounces off of a horizontal surface in a collision lasting time T. The object then rises upw5otw9-z*hd ij hw:+cq ard 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 lengthd kv i3hzh3 h7b8n)q.p L is pulled sideways until the cord makesk).qpv8hb zin373 hhd 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 ue6.*rppadyp 7oqxc.pp 6 n9z- niform incline 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. epp9pqad y-6 6p 7n.cz.*xproThe 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 cartons 7hh4us(hx a:t+ama . hfrom the sidewalk, along a 10-meter ramp to a loading dock, which is m4s 7xa:h(.h+ ha haut1.5 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?

  12.16: A constant force F=50N (as show bj vr6(ct;bonnp4(m7 n in the figure) 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 ov ( ;bmcntnrpj476b(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 restslir9, qry n/ns 90zhauo8 .l 2a:r.cy from the top of a tall tower. u:n9iolrq yz.r89 .lys/ ,na0cs 2ha rBall A is dropped 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 upward with an initipc2 klx+:a.eqfqz6s(al 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 ae2p qk:q6+(czs fla. xir resistance.

  96.20: A force of 10 N stretches a spring that has a gz g* yybz80;ispring constant of 20 N/m. The potentialyg0g *bzy;zi 8 energy stored in the spring is:

  97.10: A compressed 6*vqe :r .mp,jw rg3sxc 9rgk9spring has 16 J of potential energy. What is the maximum speed it9r 3.w mc:ev*6kgsqpgrrjx 9, can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom ofxkp r*0v - ep,k7s9gts 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 rkgve*k7xps0 9,pts - 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.