97.01: A force F directed at an angle of sy(n. 8kf e1b)k;vr yd θ above the horizontal is used to pull a cratek.ryk1; )(8vd fenbsy a distance D across a level floor. The work done by the force F is

  97.33: A softball player catches a balezd0 j5xi r(v:l 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 i(0v:d5 rez jxconstant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 sp6eo on4w2nlsj+k); kilogram sheet of wallboard 3 meter above thejw6+eosksn)4 2po; nl floor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform osjdh14i9 p9macceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in thp 1994oi jmhdsis time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg bm(// jr1-i enuq 7uk pva9xo(zlock slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreasez1pu ov/kin/ (xm(ae-j ur97qs 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 dir7fo3e re: jur- zgyr65ected to the right is exerted on a 3.0 kg block for 5.zj 3g:eu-6 yref5ro r70 s. 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 di, -o:*cyiq a xadjm ,00kiw9eprected to the right is exerted on a 3.0 kg block for 5.0 s. The block wasimj9wcki- a *: ,0qxoa0ed,py initially at 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 ai)9q-y0 qqza r8db.o 7tzis-w5c)feh kb7 9 wtt reston a frictionless 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 following0 ))9 aki 9-hez.rzdbsqw7 cy58o-qtibftqw 7 correctly describes the above situation?

  03.14: A fan blows the air and gives ixjyd 3z f,xa1qky )i,6t kinetic energy. An hour after the fan has been , jayq 6xiz,)3kx1fyd 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 pobnc9 j*odxq.m: 8woi+ sition of 3.0 m, a speed of 4.0 m/s, and an a b*8:i.+nd oo qwjmcx9cceleration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is onw,fbc7 ,q:c vx+n/z knerct7//hdx8 ny d97 qq the middle shelf in the bookroom 1.3 m from the floonw +cnrd, :yq/qc ecfv7 x7/h/td8,b qnk97xzr. 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 of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepower) of p h-ojf,znr1lv.ij4 jep/*j + jower 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 tez 1*jflrnhip 4/j+v . -,jjojhe car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s at thek8sue56te d /z bottom of a rough, fixed inclined plane. The box slides with constant acceleration to thedus8e k6t ze/5 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 the right, a boum5 +2dv )kozvx 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 of F = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/ oumdk5)v 2vz+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,t.k qoley18 ;qirh ((o each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When C1 o;.qqily (hk o8e(rtar 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 during the time in zjja(o; jc,ja3fia8mq6 w 6w6terval of t( oca 6fjj3mi j ,jq66ww8a;zahe acceleration?

  12.08: Through what distance does the objel6omo8-4qn yqmr ; p)yct move during the time interval of the ac6 m4yqrpo;l)qn-mo y 8celeration

  12.19: The magnitude of the linear m r7kqk(ag6qr 8omentum 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 chank(gr768aqq r kge in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of 0r gyyld2bb00fc)y b/kinetic energy while its speed is increased from 2.00b2 yy/ cb0 frbd0y)gl0m/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 is used to po-*opa x jhlu, r. jwd5q.4;yyull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of fri45 pr,d.xq.y; ylwju*o h-j oaction between the floor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upsdpb1r8y:x+vkkl x0 t*qwi ;;ward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant q rd;;kpti8+* w0vkly1bxsx:speed. At what constant 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 Earth, tr9b) u3o)3niuy7e pyn-wkt n1he 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 b e u n-tuw)rbi39nk 1y7oy3np)est 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 abo*qzz zr,q3 lvb,k9g)ffh4(t yve a hard floor and relea 9bftz3gr, hqylfz4v *zq ,)k(sed. 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 surface?

  07.06: A 500-kg car is za1e /a63lq :mcncp o)xoyep7r6-7 t 3oahkn/moving at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of r aa673 me poccek-t /qp:7o/ y1ozxna63hl)nthe minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it stops. Ifwab-.p2vlobeydc(tw,1 3oe oke 8k(. the ball travels 15 meters, what was the average net fo eb.ov a8wp (oeo,-(t wkl2yc3.dbek1rce applied while it was coming to a stop?

  02.26: Consider two laboratory car5p) ed+zr .ux6ud1 3g4fphwsy ts of different masses but identical kinetic energies and the three following statements. Which of the above statements wd+fwghzdrps .) u4 31 xuy5p6eould 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 in the air with zbz:p60v*tks an initial speed of 4.60 m/s. Ignoring air resist* : szvpzb6k0tance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary vd)9jnrgquia+ ,2f6c concrete surface. The boy, of mass M, leaves the concrete surface with speed v and his centerd cuv,jir)n+6 9g2 qfa 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 ailqmt; 46yhe-heightH above the ground. The object crashes into some soft earth and comes to res4 yq;ml-6ih tet 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 above+3cy w7d.sfnl4km*o;g hf (z+qj j v7a the ground. The object bounces off of a horizontal scodf*7aln7 (hys v q4jw+f 3+z.jgkm;urface 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 mon a p)0prnre tvli3:za g:),:pi q cord length L is pulled sideways until the cord maqiprl:a0z: ipn,e3v :r)tgp )kes 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.dz n7 z .tnc3ry0yp64u 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. The sled then slides bac6yp 74n0z3t. ndzrycuk 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 from the sidewalk, awr1u59kg:x e ylong 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 them to the loading dock?gw :y rk1x5ue9

  12.16: A constant force F=50N (as shown in the figure) is appl6t7rlkb( 4wd bied for the 6.0 meter motion of the box upward along the ir 7t(bw4b6ldkncline. 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 each dropped from rest from th63m/y+nne ntt e top of a tall tower. Ball A is dropped one second before ball B. After ball B is dropped but before ball A strike/yt6ten mn+n 3s the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an o)c4 1lkp ouh0v+o-8n (p9 qwsv f4fljhbject of mass M 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 th+ (h41o lcjp-os v4fqu09 n lp)k8wfvhe launch point? Ignore air resistance.

  96.20: A force of 10 N st5lov0n4z:19 mi yf cbrretches a spring that has a spring constant of 20 N/m. The potential energy stored in the spring ic5n y 9rlfimb 4vo:01zs:

  97.10: A compressed spring has 16 J of potential energy. Whe37e6- 7 bx . m/pxw o3xeuifv/z:avbkat is the maximum speed it can impart.vvpik3e-bfx3 7exzo/ :b6/e mwux 7 a to a 2.0-kg object ?

  

  10.31: An object of mazcb8- : ykw)ixej*w/ kss M starts from rest at the bottom of a fixed incline of height H. A person decides to push the object up the incline in one o:8ey )x*kkwi/w zj-bcf 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.