97.01: A force F directed at an angleh :wit d34gdj5 of θ above the horizontal is used to pull a crate a distance D across a level floo3d5ih t4: jdgwr. The work done by the force F is

  97.33: A softball player catches a ball of yyob nu,kb96.nt x.xbnk14uwr 6n*ff ,/j 3jl 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 hori,4xu jn,ju *3n .xwbk/.91nrf6 b6nklyf to ybzontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wamqm w8ld-t,j6llboard 3 meter above the floor formd,m q-tl6 8wj 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform-5pv/d:c zl1 bex*ma6+tdzc t gbt;i39rnx1o acceleration on a horizontal surface for 5.00 s. Tbx +lo;rc1/t5i *g d1 9xc dza-zv:ttbenp6m3he block’s kinetic 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 accelo-zzqyst e88- eration on a horizontal surface for 5.00 s. The block’s kinetic energy strictl-zoytez88q s- y 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 directee(sxwh0-ai kx5 2rg8cd to the right is exerted on a 3.0 kg block for 5.0 s. The block was initkw0 2x5ir s(c ae-gxh8ially 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 /qp: asot6 8onthe right is exerted on a 3.0 kg block for 5.0 /tn8o:ao p6q ss. The block was 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 at reston 91ba n+no3a2s s) e2tyn4f ilsa frictionless frozen pond throws a 1 kg hammer in one direction. After the throw, the+iases2 n41s9t 23n o) lafynb hammer moves 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 give/d exo y;)nft:pn6w t3s it kinetic energy. An hour after the fan h;6e)n pntx3/dwo fyt: as 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 position of 3.0 m, a speed ot.z bismiu.evhu -dupv mj3 7 1. jqo8q15;s)sf 4.0 m/s, and an a .dm)i;u7puvjs3m5v ses.8 ojqui.1 1hbq-ztcceleration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textboocxie:no//ls6 uxrps :w80+)t no9tnxks is on the middle 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 much work does he do on the box. The 8nnx6:csre 9tnuoxx+) o0sti/wl/p : box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepower)/ )alfiige 3gr25it 5qvu:wf/ap5n3a of power to a cart/au a532/l iprn3f:5fg eiqig )5av w'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 the car?

  09.13: In the figure to the right, a box moves with s/j pfua,lfj:2 3vc0qcpeed 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 op23j,qc / f0f:jca ulvf 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 tc- u*, jzinrwb5wm1li,riay44 3 ; horight, 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 of F = 240N. r1z,wru; c-wb 4ay,lhj* o3iinmi 45t 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 the right, each starting from rest, along a straight cmnzzg y89m.l z:g./yroad. CarA has twice the acceleration of Car B. After traveling a distyz:l/.9zzmng c8y m g.ance 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 ta(4v:hpx1 vxtben z0 . *sy2mthe object during the time interval of th.b( xz:y*t2t0spvv4xhma ne 1e acceleration?

  12.08: Through what distance does the object move during the time interval:k73 y, e4s,rayb pzpc of the accelerati7:y bka ecp, pr4,syz3on

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is chanfu4j ,-j*x t-g ovv.ifged from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What is the change in the kineti* ji,ovt4j-vuffgx- .c energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its jf h1no6o03 jgspeed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents thejnj6og1hf o03 mass of the crate

  94.38: A force F at an angle θ j myezo 5y.vmk5;e -b, above the horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocityyo5.z5,by-eve km ;jm. 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 p9 ,(t+pmpaay zower output of 0.10 w to raise a block vertically at a constant speed. a+t mp(9ypza, At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rw; + ey7y4sw-.zehyhhest 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 amoyhsh4wzyw7 ;he+ ey-.unt 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 a4+r4 h/ecmco .n- jus3 7i9+rvlujw cibove a hard floor and released. Assuming that the col43+umr ev jw7-4r lic+snuic.9 c h/jolision 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 movinfl2q9)8 mqahrfl p9; ng at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to comepm)q aq992hff; 8r nll 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 uniformlyz1tbxznr7 (n;eyn6s m3pk9 p) until it stops. If the ball travels 15 meters, what was the average net force applied while it was coming to a stopnybxr1pszn (9 ;em6nz7p)k 3t?

  02.26: Consider two labora2om2 im/qj2c4 ;ks aqfzf:1uytory carts of different masses but identical kinetic energies and the three following statements. Which of the above staajm1:yqu2 izqfco2k2fs;4 /m tements 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 claap-p+i8fjp p1 y 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 ene pjp1p8a-fp i+rgy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward fro e m d.oins+2wwk838yym 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 mk8syi 2we3+o nd8wy.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 f( vj2 m1:,wzj5rhjty yrom aheightH above the ground. The object crashes into some soft earth and comes to y5rzvj,w:m(tjj 1yh2 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 above the ground. Th,cp-alyx3m, v dkfnmr.ai5- : e object bounces off of a horizontal surface in a collision lasting f-,xypi5avlrmn ck:-d, 3m.atime 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 cord length L is pullgd 3o;wvb s .px: nvrh,pemij-2n523ced sideways until the cord makegi.3h osmp2dx jn52vv, b-pwc;en:3r s 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 x: 2ogd+ zf.o xqji4if 1:ygt-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. The sled then slides back down the hilo 4 .fo j:tigqixdf:y2-1zgx+ l. 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 sidewavw 3 h7-6jgilalk, 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 them to the loading dg v3h-iwj a7l6ock?

  12.16: A constant force F=50N (as shown in the figdbf 1c;+n cnr9ure) is applied for the 6.0 meter motion of the box upward along the incline. The mass of the block isb9 +1ncfdc; rn 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 fro ptok,r-l.s1tm the top of a tall tower. Ball A is drop1kpt,l-. s torped 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 initii+cbdx067o gt 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 0+obgt d6icx7launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring constm 40kt2+owmgt ant of 20 N/m. The potential energy g024wkm+ttmo stored in the spring is:

  97.10: A compressed spring has 16 tiws(juv47r .xq v5,5ljst-cJ of potential energy. What is the maximum speed it can impart to a 2..t,xc -55uq(swvj vtlirs7 j40-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixyx1w2 xx*frgh).+fp yed 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 sper)h x.fy gw*1 px2x+yfed 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.