97.01: A force F directed at an angle of θ abop5 c2hp b+z- ixksx-.cve the horizontal is used to pull a crate a distance D across a level floor. The work done by the fh +zx2c-5 x .ic-kpbsporce F is

  97.33: A softball player cai3b*a5rv v ms)tches a ball of mass m, which is moving toward her with horizontal speed v. While bringing the ba3v ivbm s*a)r5ll 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 ljri ,pjr8f7-3t r dpu/aborer 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 wallbojfj7,r /p38udi trp -rard?

  17.11: A 5.00 kg block slides with uniform acceleration on a hori:yydd/l y5uwb.w 7q-o zontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this time.w yd yb:-yq.5udlwo7/
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 a cw+.itr4/(a/aweq g horizontal surface for 5.00w a(it+a. w4a gcre/q/ s. The block’s kinetic energy 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 to the right is exerted on a 3.0vn 32 g +l.q nykuooa44au+6ha kg block for 5.0 s. The block was initiallynn3qg v4 2ol haay++ka46.ouu 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 foryikg1ysq/0q .)rrtv w 7l vj6:dmp q*8ce directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at restr 07g) t sqy16vq /kylj:pi.r8wdv*m q and slides on a horizontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initiallyh tkk* 3f7c7ysgc910ufeq- ev at 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 study7*fche -u03v 1 ek97 gftsqkcent 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 after the fdzknv l,c9l-c n+ ls*bp11 th*an h ,c+*v-clh9tl nb1zln *ds1kp as been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a bl9hh.933*jx lt)gxf kj pcbkbfc3llaf y8 ),,x ock of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an a3 x9cal,3,lb).c h8 fy3 j ft jp*)fkhxl9bkgxcceleration 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 book.ok* yqu)y.uz / jrlx*room 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 box has kux.u/yl*q.zry j)o* a mass of 10.0 kg.

  02.32: An automobile engine dei8id :zhu92eflivers 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a conf i28 euzi:h9dstant 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,sdl h r.m 4ps )c+pq4*bhb2gc speed 5.00 m/s at the bottom of a rough, fixed inclined c)dqs4p +m*l sr,h.bgc4b2ph 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 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 speed 5.0+psr1r su v2d80 m/s at the bottom of a rough, fixeu1v+r dss8 p2rd 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/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 travenncfnok 4) *ll9i2k3*,q lhnjux 49ltl to the right, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has4l 3,n*) xocf2qnh uljikk lnl4t*99n 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 during thgwyw 3kn)f-rl* kh 2e8e time interval of the a* )l-rk83 wnhgkwe2fycceleration?

  12.08: Through what distance does the object move during the time interval ldz5x(+wnu 0hyh/ m y/of the ad/+5h (/ wynmhyu 0lzxcceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point ma6,3z qfrmc tsna,94kpss is changed from 6cz r 3tqknf4p ,sa9m,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 interval?

  14.11: A crate gains 36.0 J of kjtu hac(6lsf .zod+jn;54d7 q inetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the folfo j;+aq 4 s(udlnjh7.t6d5c zlowing choices best represents the mass of the crate

  94.38: A force F at 9 k:lrc ug/c)1s4a h:yqojh: yan angle θ above the horizontal is used to pull a heavy suitcase of weigh y4:c1jkaqo 9ls:h/) yhu:rgct 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 force is:

  14.31: A toy crane exerts an upward force and delivers a usefulbt0qgt .;b0pzx*g bhm 8/h e5y power output of 0.10 w to raise a block vertically at a constant speed. At what constanmp tx0gh;/ ez. 5gb8 q0t*bhybt speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is releaq;)yjjv. mndl7t) +r vsed 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 gravitational force acting j )vd v .+;m7qrlntyj)on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is he h jydaej;n q9a6o* c.v-;d:nsld motionless a height ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relationship between the total e .vacq9eyhn j on*s;j;a:-dd6nergy E of the ball and its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barrier ahead. If eq q3sx;0iy*pthe car takes 95 meters to com3i p;syeqxq 0*e 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 downqu mz6*s)n+qfbcoo,3o 3(kml uniformly until it stops. If the ball travels 15 meters, what was the avoqq6uf+*)3 , s3lnmkmzboc o(erage net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kine52rrb*o +9z te0 ujxj/e+cakiatu * c-i o6jz-tic energies aja**2 eruj 9czc/rjto exozi+u -+ika-0 5bt6nd 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 tossed vertically in the airo 9rb.6s1 .hxywv26c(qphok o with an initial speed of 4.60 m/s. Ignoring air resistance, what is p1.( wr 62 bk6xv9. qhycsooohthe change in its potential energy when it reaches its highest point?

  06.20: A boy jumps fromooj43(h9fp4wbu s8m o rest 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 a3f(bwjoph o84usm9o 4nd the concrete do on the boy?

  02.48: An object of m) s)d uy t/onyz+mn2gtga3w.3ass M is dropped from 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 ozt).g ag d+ nynt/3mu32ywos)bject while coming to rest?

  12.48: An object of mass M is dropped from aheigh:h a)*3 xan p+tg; zv4noerai1t H above the ground. The object bounces 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 ofgr 4a 3en ax:zot) 1p*a;+hvin 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 ps mmj (h9p(*iqulled sideways until the cord makes an ammsh qi(p9 *j(ngle
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 u(kfr egg7 j -xv99g/y5tlc 6vcniform incline of unknown angle. The sled, which started at the bottom of the incline mo g(e7xglvv-fk/crc5 jy69gt9ving 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's speed when it returns to its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the/ - .r ahhpv4 nd9,/leb doh- (fkwrlb0dr4ya) 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 them to the loadirl hbdkh ovhn- 4(r/-,rdde9af4a.)/ lpb0 ywng dock?

  12.16: A constant forv3mlb sv-by*/ ce F=50N (as shown 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 the following choices best represents the work done by the force F onthe box for the motby3*b/svvm l-ion?

  04.48: Two identical bowl9x u5jkh*k3jz s *.oweing balls A and B are each dropped from rest from the top of a tall tower. Ballj 9x*zhs * .jwuk3oke5 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 a3mrh ptoevntg7 21((en 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 dom3n2 7vtep rho(t1e (ges the object of mass 0.5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring t6ud 07un) w lhu(0yncwhat has a spring constant of 20 N/m. The potential energy swuwc0u6)ydulhn7( n 0tored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. Whaef, gg(ht17*l0l:shq0lvb k f s)w n0ft is the maximum spee0e0fs slhf 0 k,(l7vgf*wqnb1g:tlh)d it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a f +32zc jvps97;wmznu xixed 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 topu njzx+cwzs3p 9 mv2;7 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.