97.01: A force F directed atzk pgl t2)*xih51 s/ft an angle of θ above the horizontal is used to pull a crate a distance D across azxtpg lt/hfis12k)5* level floor. The work done by the force F is

  97.33: A softball player (hml0ch15t av catches a ball of mass m, which is moving toward her with horizontal hvcm 0(t51ahlspeed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction lab.jt1 suz3z e6aorer holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the walls1az 3zu6e tj.board?

  17.11: A 5.00 kg block slides u jwkwo-189 tn 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 in this ti wjk-w8 o1tn9ume.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block s9 whg(pfh-)1qwxpfov: rl, ,xlides 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 ipox,hpw lq 1vgw-( fh)f:9,rxn 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 to the right is execwlmv)(c hj4m( (bpd,rted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a wc( l v,d)c4(h (pbmmjhorizontal surface.
What is the speed of the block at the end of the 5.0 interval?

  16.12: A 12.0 N net force diay;s 4t/a e2oke*x+h crected 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 4tox;eec/ kas2ha+ *y horizontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a frioa- el x+p17ph423ude+tscizctionless 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 following correctly despc+u-oe+4hi7e3 s 2p1zltx dacribes the above situation?

  03.14: A fan blows thp1m,vai: p5nee air and gives it kinetic energy. An hour after the fan has been ti,m 5v na:1eppurned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of massnxe /j ov;(wnd/*tn3yt2;wi nt/lt o 6 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, andxt *tj do w3nto2y;v6wiln(;//ntne / 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 md6lc(:lp sfu0:c +t bd from the floor. If the janitor relocates the box6(l:fpl+0dt dsbuc c: 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) o 0mcsr**n4f 1o.nap9nipnwra+/z b5 yf 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 a*awap/ 0nz*p4myoicsfr9b rn .5+ 1 nncting on the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s at the bottomnkzz o)6af1a zi/1,zx 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 m1 z,az/z6)1 zk oaifxn/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 wm0g f ga/7s*bbox 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 i*wsm ggb7a0/f ncline 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 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 fwb 4:bpdvw lm7v2x;8 trom rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed m;:2 btwx 8d vp47vlbwB. 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 dur:8-w(g*p xs yp qn la4vg01jbving the time interval of the accelexav :*yg jl-1(4qn gbv 0pspw8ration?

  12.08: Through what distance v y6: aj0j i5duljc(sr rhvor ;l2*0u8does the object move during the time interval of the acceleratioj0j2 yvcr i(0ur *sl5la86:roud;hv jn

  12.19: The magnitude of the linear momentum of a 4.00 kg point 6 rp,.qqaa tr: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 the kinetic energy of the mass during this time t:praq ,qr6a .interval?

  14.11: A crate gains 36.0 J of ki,i7 tjwqn-h6 jnetic energy while its speed is increased from 2.00m/s to 4.00m/shnj- ,i7j6w tq. 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 isc*r as1dbt;u :r* fho( used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction beb fd so:*;(ar1ctru* htween 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 sce fq8v5 8gv0delivers a useful power output of 0.10 w to raise a block vertically at a constant speed 8svvcgeq f508. 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, *1(s c4lcqo nar2 /5lu3 wmsezthe gravitational force acting on the 1.00 kg object by the Earth does 10.0clmqrosw3 zn42lc/(1a5 *ue s 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 hard floor and 1fgix4p(fhj9qun cl:nb2- 5 7ulj1d areleased. Assuming that the collision with gu4ncf1ij :h195lpu 2(nbd q7-l fxjathe 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 dri:ug fdr( dro1):jm0qa ver sees a barrier ahead. If the car takes 95 meters to come to restm:u(:r1qda j0rdg ) fo, 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 uniformly g9. w2l(ab0t ieq,mft until it stops. If the ball travels 15 meters, what was the average net force applied while it was cobeft t0g aq,(l92i.m wming to a stop?

  02.26: Consider two laborlpif36 yluzk jl -6k3aq k7 .3:rwf/xjatory carts of different masses but identical kinetic energies andf:3 j 7r6kpk.fyl3k-3 auiw6qlxzlj / the three 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 tossen:0 xo:ie*fsb, p d;rpd vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance,*fppesd,0 x:nio; br: what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straightnly a9c,5rzrum8n k(15ob y :k 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 the con:y8n lbm5c19r(yan5kou k z, rcrete do on the boy?

  02.48: An object of mass M is dropped fromzh ;48(fgpsbjzg - uz; aheightH above the ground. 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 force exerted by the ground on the j; -zh;ggs(8fpz zb4uobject while coming to rest?

  12.48: An object of mass M is dropped from aheight H above the ground. The o41cszs2gyf h8 xlvpa t.6f/ c9bject bounces off of a horizontal surface in a collisio ylc4cx vs./a2 t ps8h6gz9ff1n 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 cord length L is pulled sidewaysk:v(q2a 8s 2zlsz: thd until the cord vlsd:t:k (zq2 szh a82makes 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 ur6tmn,mb (v mh ,8f;kc1+fe gdniform 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. The sled then slides back down the hill. What is the sled',m+mchbr, 6v1gtf;ef km8 (dns speed when it returns to its original position at the bottom of the hill?

  06.09: A deliveryman mole1 5md2m13 0qq*m2 st1rha)w0 mg4wuu xhsvsves 10 cartons from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton hx *m1g m1trvw435 dq1h2 0s0s)helmaqus muw2as 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 1wegyvk (4a0 i :e9eytF=50N (as shown in the figure) is applied for the 6.0 meter motion of the box upwakw:e4gi19( yv0ea yetrd 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 each dropped*kvq f v9l-0l90eylhv from rest from the top of a tall tower. Ball A is dropped one second before ball B. After ball B is dropped but before ball A strikes the ground,evl-f9qvy0 lk 90h*lv how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upward with kqh,y9iarmo py ,2 mks0l.2 u9o0d(nran initial non-zero speed v. The objec0 n9uskhrd02rom ,,mk. p(yaolyq2 9it 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 air resistance.

  96.20: A force of 10 N stretches a spring that has a spring constant of 20 N/m. n+ i6ds,-b3/se+pimaj 3iryh The potential energy stored si6bip a-,eri 3j+nh yms3d+/ in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the4t*enj.sk7-oj km p*m maximum speed it can impart to a 2.0-kg.*ojke-74j*mntk psm object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incliaa1ipv5jc 7o(ne 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 wou a7jop1c (avi5ld 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.