97.01: A force F directed at an angle of θ above the horizontal is u8 wabae/0 u*sased to pull a crate a distance D wb/ase8u*0 aa across a level floor. The work done by the force F is

  97.33: A softball player catc cn 7fca*;a.f0ua3bxkhes a ball of mass m, which is moving toward her with hori*; kxuc f3bfacan7a0. zontal speed 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 laborer holds a 20 yrlg61z(5sqq kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the wallboarqrql1 gz65(ysd?

  17.11: A 5.00 kg block slides with uniform accerv:s lp )p5ui9leration on a horizontal surface for 5.00 s. The pu9 pi)s 5l:rvblock’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 acceleration on a horizi / n;n2hh3sg90mo6vadh :b.v +cduiiontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J inbh i/g v n v;co:aih.u3+shdn m29di06 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 rightk uptbge )zj7f,12 l8m is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides ljf)bm 7pkz1ge,2t 8 uon 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 exerted on a 3.0 kg block for .4 xk tve x46uksc4mcj hgbx)*31ksu) 5.0 s. The block 6k1ecxk*)b c4vs)hk m tsg4 j4 3.uxxuwas 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 i*eb 3zlfh/ 0vo/:yun 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 // *:vzhb30fnluy ioethe 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 after the fa8qmw +x9ted7v8 pb n)kn has been turned qdk7 v wnxpt+be8)89m off,
what has happened to the kinetic energy of the air?

  09.05: At an instant,t:* j1ruon+ko a block of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an accelerati1*o kjo+tr:un on 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 mi+0ndcqok8h;m ug)vu1mo(w+gx 5 l- eoddle 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 ou)d1;(k5ogw+m + muo l-qvhxgen8c0he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 hort ,0nsk hdaose.5*2s67 xhdqksepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65 mph)qs076 .t,d*kxhd so2esn ak 5h, what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the rizhg* d 63k5hkzght, 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 constankzzkg3hdh5* 6t 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 5vio* y1263r pk;1iipvuit4vd .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/swhen it re4vip11ik62ov; t yudrii* pv3aches 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 righ prff2ojy8e-xh:3j x1 a-iw.ot, 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. y 8wirx-a .-f32oojj:f e x1hpWhen Car B has traveled the same distance F, what is its speed in terms of B?

  12.07: What is the net force act2g g,bhfra a864h) 2 0nhk) anumesrk;ing on the object during the time interval of the accelerat rbn6 fu k0,)ea8 r)g2s42aahgk;mhhnion?

  12.08: Through what distance does the object move during the time intermj ,;ogv*o uo2val of the aug,m jo2o; o*vcceleration

  12.19: The magnitude of the linear m 8a9moj3bg3b s.f5pre(j wgzpc/h x-9do 22x uomentum 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 the kinetic energy of the mass during this time interval?w3/ r3 gpj.pzxm x aufb5s 9ebo9-c2 8ohjgd(2

  14.11: A crate gains 36.0/jvrsj 51ygii:qx+ b:p )9j/n v/w;chqgny;w J of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choicjp;nqvb jw;1 ):+5 //ysn9rgwi/: hvcyqgi xjes best represents the mass of the crate

  94.38: A force F at an angle θ aboveji)yw xk4t 3dg+ 51ghe 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 suitcajg+tw3h4 dx)e 5y gk1ise is μ. The work done by the frictional force is:

  14.31: A toy crane ekrk.m)9msc-2e uom 0rxerts an upward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane rm)mro0 r . -sck9eum2kaise a 0.20 kg block?

  12.18: A 1.00 kg object is ry0 sqbf2x.+xv/wy/rg eleased 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 f2b.qv+/xxw0 yf ysgr/ollowing 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 ym v6l ,qh(9 /gbm:skohard floor and released. Assuming that the collision with the o:s6/ vy9mlqk( , hbmgfloor 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. Thj/k pdj,edct*1hab)je2r, h . e driver sees a barrier ahead. If the car takes 95 meters to co)e 1bkhj 2c*ja,drj /hep ,dt.me 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 dow(m i(a2gl1pojb6xpw1 n+d.unn uniformly until it stops. If the ball 1b2mju(wndo1. 6(lpiax +gpn travels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kgy: -m7aqrvy2 w4tep4inetic energies and the three following statements. Which of the above statements would be cor7qyyw evgrt pm44 a2:-rect?
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 an ini 7)ycwbuac b6/tial speed of 4.60 m/s. Ignoring y/)ub67ac cwbair resistance, 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, station;cm f(7tyms+bary concrete surface. The botmsf c(7b +m;yy, 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 concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH above the ground. The s))dks+f6,3t:dac imad s.c tobject 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 ave 6, kdi)da s3 smfttc:c).sda+rage constant force exerted by the ground on the object while coming to rest?

  12.48: An object of mass M inv9b wb i*fd ow)tnc:6rm5x8w2b q-r*s dropped from aheight 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 f8wcx*nbrwoq mbr bd v:2-) t*9wn i56height 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 sideways until ta2b56 a3aa,gw yjzx9uhe cord,6y9ag3w ajauabz2x 5 makes 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. The sled, which 8q )sh(hurbmjfe+7 ugn j,0y1yl :g2kstarted at the bottom of the incline mo1l fuk jr8hms(q2bn 0,yy :u g)7e+hgjving 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 sidewalk, along0u oc 8b ekp.2c(sjh9q a 10-meter ramp to a loading dock, which is 1.5 meters above the o8ck 9besp0.2 h cqju(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?

  12.16: A constant force F=50N (as shnr()nv 3i1fm vown 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)mfrvn ( inv31 work done by the force F onthe box for the motion?

  04.48: Two identical9bk c:hdm:v)c bowling balls A and B are each dropped 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 ) mvh: c9d:cbkground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M )i 5oke-z;8y e 3a1trylz1qc nstraight 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 oyc rt1n i y)ozlkqae153 8-ez;f 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 10fa ,fqcfaj:ls0vc , -) N stretches a spring that has a spring constant of 20 N/m. The a)f,ac0flfv,s j:c- q potential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the maximu9ub0dlx)wp) d m speed it can ipxdu )9w)lbd0 mpart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fxly w)o1l f8e.ixed incline of height H. A person decides to push the object up the incline in one of two ways with an applied for)x81l o.lwfy ece 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.