97.01: A force F directed at an angle of θ above td2it:zx u z*jq5lq i;6he horizontal is used to pullz xztj l:qq5i;*i d2u6 a crate a distance D across a level floor. The work done by the force F is

  97.33: A softball player cat5ugx +u zf78thches a ball of mass 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 exer+ gu7t8 xf5uhzted on the ball by her hand is

  99.14: A constructionjiyhgs67di nzhz(92 v;eh7;ioh w o1naj -+u; laborer holds a 20 kilogram sheet of wallboard 3 meter above the floor fh g ;edia i+zhh9(nu;- v7 j6wys jh71zo2;ionor 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides ( 4 (9f8f 5z9jitipdgr3rno-c1f wil rwith uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy iw-p 4ft8n ril1r3fc(j5(f 9rio9dzgstrictly 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 acc0.wnt m3n0 v8ounqsp*eleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J0woun q nnmvtp*0.3 8s 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 tk .9g 5 ze,tcfw6mm1z s2-xjqdirected to the right is exerted on a 3.0 kg block for 5.0 t6-wzf5,s. gkmz j2q9tmcx1es. The block was initially 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 exertednf- ez04c5at s on a 3.0 kg block for 5.0 s. The block was initially at res0a sz5 4f-tenct 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 frictionlesf7 v uo s78adqhgv0ov31)p5qu s frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer mo 3u5sg7vaf8 1vhq ovo7) p0duqves off in one 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 gives it kinetic energy. An hour/4r-p uh ai:ld after the fan h -:puialr/4 hdas been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 b hgh 5sqheh8yd*sw9q. 71. hwkg has a position of 3.0 m, a speed of 4.0 m/s, anq.h bw78*.h he5h y h1qs9dgwsd 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 middle shelf in the bookroom 1.3 m fromun9 .bqj5yojp6p) o0y the floor. If the janitor relocates the box to the shelf that is 2.6 m from the fly.b y0qpp 6oju 9on)5joor, how much 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 32 u1l g;1um/u5l)xp)2pvpky(oh-k ,r rolwhp ; horsepower) of power to a car's driving wheels. If the car maill p,wlrory-5; uu1vmkx1ph/ku)(p2p;oh )gntains a constant speed of 30 m/s (about 65 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 speelrylzm p.d*md4c-5 7dd 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, has a speed of 2.50 m/swhen it reaches the top of the p 7cd5 lly.mr-4*d mdzincline.
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 speed 5.00/h e 5-+x-lhiob;sruvb c(fa+ 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 constch-s5o;xlbehu+(i+farv b-/ant 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 t3sf /0 eww(ylto the right, each starting from rest, along a straight road. CarA has twic w l0f(yw3es/te the acceleration of Car B. 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 object duic6quv4wq t 74ring the time interval of the acceleru76 q4v4ciqw tation?

  12.08: Through what distance does the object move during the time d6 /7ic. z4inb6ym2f yqtbso7interval of the c b27. 7yomn66 iybzqt/f4d siacceleration

  12.19: The magnitude of the linear mome* .d.yghi8hu( 2th;yb nk)nkh*wq7 e zntum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What is the change in theb8d)n ;iq kwnt*.27 .zhe(k hh*u gyhy kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J oh.fdhp vmp/ kdg+:f95fp 9vr,f kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mp 9r d,.k95vfh+ /fgpfphdv:mass of the crate

  94.38: A force F at an alw nxpet094uvdr-p 9 ;ngle θ above the horizontal is used to pull a heavy suitcase of weight mga distance 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 forcxl;9p u0dve94- tnwpr e is:

  14.31: A toy crane exe ux o(8u*gt3ev:n)pc)knz;afrts an upward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speegzu(8 xnvt* ck;pfuo)en):3ad. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg objidkug 5lk,boqma2tu(f 92i92 ect 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, which one of the following choices best represents the amount of work done by the gravitatio glb,tii 5qda u99 f(m22uokk2nal 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,jox39vgj-*oq )sq e +5albu o above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the fol5,ja9gq*q j- u3s+ove o box)llowing 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/s7x .:bybvig-.fw;itd. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average ne t.i7y:gb.b-if;x wdvt force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s 9cei+y2 vzl4vqjv;, b slows down uniformly until it stops. If the ball travels 15 meters, what z+4i vljbc y9e2;vvq, was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts 3e v;0php+kawof different masses but identical kinetic energies and the thh ;0vawk+p3epree 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 tossed vertically jje/ku2zvg6qd5luw81uu 2s7;c wf/fin the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reache2uec85uuujd7 wj1; v6qklswfz 2f //gs its highest point?

  06.20: A boy jumps from rest str bfy1f,.9bmzwo slhsiq c* 6*0 p.q8pvaight upward from a flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface with speed v . *16 s,sbpqhfq8w.omc9y p0 livfzb *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. u1 a7oe+qoa4yl:f ,nrThe object crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Assuming that air resistance is negli 1nf 4+urq,a 7:oyoelagible, 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 above th8 qco7/t)eq7 bjwo)aa , 7uecfe ground. The object b aue,oc77/cqaf)wq 8tb)eoj 7 ounces 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 the collision with the surface?

  96.38: A pendulum bob mass 6zjm 025:fw3obl/ap akmz2ntmon a cord length L is pulled sideways until the cord makes3 2abz5w:t0/ zj fo aln2mmk6p 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 z( rek0h8 5pnpuniform 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 its50(rzh8pkp en 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 moves 10 ca ysg;0fu lpib5ko0 6l-rtons 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 move thempfb0-;0iu5l y 6k gslo to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is 3 l)m + +uw;yzxa0ucc n0rf.xwapplied for the 6.0 meter motion of the box upward along the incline. w fuccxml0.+w 0 zy3x;)na +ruThe 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 each dropped from rest from theb* qh ;,qvo azkc3)re6 top of a tall tower. Ball A is droppq3bvhzr6eo, *ac q); ked 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 in3ns,q0 5b8d: vonbhq + jumcc (9d7snfitial 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 speed9 qmn,v( :qou5+s3ddcs 0j 78ch nbnfb 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 ks kzgoqu1, iir 11n(/spring that has a spring constant of 20 N/m. The potential ene/(zkqs g oi kuir,111nrgy stored in the spring is:

  97.10: A compressed spring has 16 J cvzml 68 zx56tbvnoy48j+k/ zof potential energy. What is the maximum speed it can i 6t5nczx+z 68vm /kzvybjo48lmpart to a 2.0-kg object ?

  

  10.31: An object of mass M starts o;yi8 oz. 7)w+ xgafdhfrom 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 a xh7agwyoo+df.;i) 8zpplied 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.