97.01: A force F directed at an angle of θ above the horizontal is11zuhk20vbeq used to pull a crate a distance D across a level floor. The work done by t110 evu2qz hkbhe force F is

  97.33: A softball player catcher a.nhzui/w(y:f)+ dx s a ball of mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced.wif n:hzr/a.uxd )(+y Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram shen 7w org 00)bkvz9;k0,:hngw amj9k zuet of wallboard 3 meter above the floor for 4 seconds. During these 4nw g0gkbhn)7:;zuv ramz,k o900 k w9j secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block ae dv 3,hi9lw3 slides with uniform acceleration on a horizontal surface for 5.00 h3 aw l,d3vie9s. The 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 acceleration on a horizof*pacwfe.. p-2 absi 6t5v um0ntal surface for 5.0wi6et2.mb-*cafp0 f sp 5v.au 0 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 dvi ukrl bor-a-fr449+x7 e0 ptirected 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 horizontal surfa 4+x0trirpk 7ba uefvro-- 94lce.
What is the speed of the block at the end of the 5.0 interval?

  16.12: A 12.0 N net force di 2 lpe:v(3byjprected to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and ly2p :j pvb3e(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 a frictionless 4 1tq;v ;badypfrozen pond throws a 1 kg hamm;1 vdt;yp4a bqer 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 describes the above situation?

  03.14: A fan blows the air and gives it kinet0teu:ht:3ho w*1sytl ic energy. An hour after the fan has been tuluh0ot:1wt:h* ey ts3rned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, 2c e(7gsgm9of7e 3 zmra block of mass 0.50 kg has a position of 3.0 m, a speed of 4.0oegef z3scmm(9 7gr 27 m/s, and an acceleration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old te8w* z kf7rmj8 *+o, q0qrbsldextbooks 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 z l*ojr,78w+qsk rfm*e 8db 0qbox. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (abou2r5nl a+ov(*. bttol ot 32 horsepower) of power to a car's driving wheels. If the caro t*+. lo vra5otnb2l( 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 thg; y6xj6z pqc8w1l:sr-qm ; wye right, a box moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slideq1r6pw y zqcj- xs 8l;mg6:;wys 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 5.00 m/s at:odu p --b-vre the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the incline as it is beingr eo-b-p- ud:v 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,z jc ,+p/luiy5eyln ry -t-j(1 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 Car B has traveled thtyj/u-+ 1lriz yl-( ,njcp5ey e 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 interh 8+dt . t1ot2*:ck yiou)0ogl bx+owdval of the accelerati+1:c ot y 8kwogtidobt+o *)x.h2u0dl on?

  12.08: Through what distance does the object move during the tcsev5 i +,l1 os7ttz; f)smo)rime interval of the accelerationsm lt;7+ofsi 5,c vsz))r et1o

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is chanmdl s 1yefof0m i;:1p,ged from 6.00kfo:ms 1m0,ye;fd ip1lg.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 kinetic energy while itsbec g 1),6qxdw speed is increased from 2.00m/sx )c6g,dq1bew 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 to7i k82 kn8 yz+tca8lf- ,fklej:* vtqd pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of tki +*f8dk8zq a:jf8vn2eyc,7kl-t l 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(1p4b ;( ezct:rvt eeo power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raise a 0.20 kgocv;(e14r eb (e:pztt block?

  12.18: A 1.00 kg object is ro)wnx h8f1c6q9 v,g dveleased from rest near the surface of the Earth, the gravitational force acting on the 1.00 kg object by the Ea9)8 h ,wnvov gdfqx16crth 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 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 z7n)fp0dn z.g and released. 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 surf )0.dpzz nn7gface?

  07.06: A 500-kg car is moving qb cxu6wue4 ;jll9 ,l (*mwx0aat 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to cou4axwq 6(l9wle 0j b;xu ,lc*mme 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 slowl2o 35)kv dcevs down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was coming toce2l k) 3vvdo5 a stop?

  02.26: Consider two laboratory carts ob 4k 71xx;zrkmp3 a(auf different masses but identical kinetic energies and the three following statements. Which of the abo7 (;baa4mxk p1z ux3krve 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 to o*oudji9 ro,i-s) m)qssed vertically in the air with an initial speed of 4.60 m/s. Ignoring air joouid*) s)-9or mi,qresistance, 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, statiqy 3k/w4r 4vovonary 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. 3w/o4 yqr4kvv 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 M2 +;l0fn li /wvhjjl8l 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 o0j8;vl hw+jf2l/ nil lbject while coming to rest?

  12.48: An object of mass M is dropped from aheight H above 8 o7v8x xi7izfthe 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 thvx8o7fi8zxi7 e magnitude of the average net force acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mocg;d 7byl;/aqn a cord length L is pulled sideways until the cord makes an an/;a dg; cb7lqygle
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 angl6:;xix:j dq g)cm9 o ftxy44 1xq;qmfae. 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 fo4dqmxg4j: )6:f9qy1t m qxcx iax; ;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 osmxu)-,gpo*0,zb be 7u ey g-from the 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 t u 0, eesoby*mx p,)u-b-7gzgootal work done by the deliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N :yoer(h-heu dk:2oqb zh2 4g6(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. Whh(o:hodz4y k2 e -u:be 26rhqgich 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 restndcc3, 0 adp,0sati:. ;rmvzq from the top of a tall tower. Ball A is dropped one second before ball B. After ball B is dropped but before ba mzp, da;c3naiv, s0.cqtdr: 0ll A strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws at.l09,k+ijw. hztiu-mel y5 i n object 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 per-y kzmtwlli+i 9.0j eh,uit. 5son 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.b6+ ;v4p gmwvr/ypc.z The potential energy stored in t/6w vmbr.pycv+4g; pzhe spring is:

  97.10: A compressed spring has 16 J of potential enehhmk7 j,u 0ox4rgy. What is the maximum speed it can impart to a 2.0-kg object ?m0x7h ,j h4uok

  

  10.31: An object of - q8 pjk,;)fnci jt*cymass 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 of two wa,np cjijkf)8c ytq *-;ys 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.