97.01: A force F directed at an angle of θ above the horizontal is used to pul5 s q0z6 gbid-fe fu3ykqb21e6l a crate a distance D across a level 5sfi0zy3d16ue2 qb6kbq-ef gfloor. The work done by the force F is

  97.33: A softball player catches a ball of mase9;f)to8kgey8 k bb +je:df0wa4ex u9s m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming consekea:)94f9kgewubxt;8 +y8 j fed 0obtant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilog:l196txa0)r1/dtiw mp-ekj3 vr gyq o ram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expenwo1x g1:ietyrjm0k93pq r) vtd/l- a6ded on the wallboard?

  17.11: A 5.00 kg block slides with unifor7skgzgbv4; q +m acceleration on a horizontal surface for 5.00 s. The block’gg+4 7s;qzv kbs 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 w vv,,s0mnh ;bwith 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 v,mnvs0hw; ,bin 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 3.0 k+ a9b*h3v6ns fjzrgq(g block for 5.0 s. The block was initially at rest and slides on a horizonta sh ( *fgzn6qj3r9+vbal 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 a3w 6l9 ih-maoon a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizonta9 6-3whlim aoal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a frictionless frozen pond 3u*ggmw+z ;ul bi; is9throws a 1 kg hammer in one direction. After the throw, the hammer mmig +*3; ;wbgui lsuz9oves 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 kinetic energy. An hour yv;ctg*n (3/gjks 4ufafter the fan u gyf *ng43sktv cj/;(has been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, aw.+qwk-z) zxdptn) / c m0tzzx-wd6+c block of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an accelemt-zwdpz+kxz6 .ccwn w0 )-/ tzd +q)xration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is o- ;w/eb e*vivt:0yc) nd ;xg 6h;tgvwzn 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 t-ywczxv*g/6 bi0e)n:h;d vt egw v;;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 24,000v. xw k;kkn0i )ea48nq watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 ) kex;wi0 nkkan.q 8v4m/s (about 65 mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure tlw4q- nieb 54lo the right, 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 incli4w5el4li qnb- ne 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,1(sa inovq.5+pfj*ce 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 tooqca.ifs*jv (p 5+ ne1 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 *al14hza,ps f azv5d+ 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 has speed B. When Car lzhvafd+za *4a, 1p5sB 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 the time interval ofqiy wpbc7*9r2 the accelerc ib p9*wrq7y2ation?

  12.08: Through what distance g5r ..ibsr,ct does the object move during the time interval of the accel.,5gi brsrtc. eration

  12.19: The magnitude of the linear momentum of a 4.0o s6hl)kp7lbva e ,.0o0 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 i6o7 ll.o, ahepvk0)b sn the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is increased fro dg8 09ql.rfmdi0uw *5g fo,zmm 2.00m/s to 4.00m/s. 0gqf.z dw09gl8 r*5m,od uf miWhich one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontalnms4-he 0oflf(1awm3us qi6ndl9a7qmw4 30 e is used to pull a heavy suitcase of weight mga distance d along a level floorm9e6fn4 l(ow30 umd0q 1ahs73m s4w-laqfie n 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 e7fp sf:22 sgvhxerts an upward force and delivers a useful power output off sgs2h:2 7fpv 0.10 w to raise a block vertically at a constant speed. 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 Earj8dz 1c xkh x*4 yop5qga91y*ath, 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 best8gokh d15yyq *1ac94pjazx *x 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 kgs . xdiu*tc:9+sj e0above a hard floor and released. Asses +g :ud .9xk*ct0jsiuming 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 surface?

  07.06: A 500-kg car is moving at 28 m/s. The dr6xy hcww:x lj-p vzi .n3n371jiver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude i.61nlnwc j3x zp-w3h:7 y vjxof the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows r4 0ks4,xevz )rhm5n ddown uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was cominrm)xrz h4s54ekvnd,0g to a stop?

  02.26: Consider two laboratory carts of different masses but identical kiya2u 3d66/vt kqep +bbnetic energies 6a2dytv36pe+b k/buq and 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 y xvbt+ip6l9w4h- ;ke air with an initial speed of 4.60 m/s. Ignoring air resistance, t+ ;b9xkylehvpi6 w 4-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, stationa h h-p:bqhl.h+ry 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 fehhhlb: +ph- q.et and the concrete do on the boy?

  02.48: An object of mass M ivx6xu et m(uf9y 9n+8os 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 au(on+e8 f6xt yvx 99muir 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 t *ihs -l ilye8xwwmb*/b oprak1x( 5(e n)y1c;he 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. Whbb8; *kp *h(lxe- ( )yleiisxany m/rc1oww15 at 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 th4 xorki *n6r:de cord k no*irrx6 4d: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 chg7pb0j :4bw, which started at the bottom of the incline moving at 10.0 m/s, rises to a height of 3.30 m above its startgbjh 74pw0b:cing 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 fxt 5njwc5.+weu n nk5)rom 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 tk+e 5u5)ntn 5wx. wncjhe total work done by the deliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as sho iag9 /4cc2ghnwn 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 thc/ c ggnah94i2e force F onthe box for the motion?

  04.48: Two identical bowling balls A andkk; 1n z*uc+er 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 ground, how are the mechanical energies of the two baz + ekc*;nru1klls changing?

  11.28: A person throws an object0f n 8gxuye+sb1le71v of mass M straight upward with an initial non-zero speed v. The object risug 8+07 lye nebv1fx1ses 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 ,tv3- nykmz ,cthat has a spring constant of 20 N/m. The p,tv -n3z, cykmotential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the8f puvqsf04:t maximum speed it can impart t0vf:qpf4tus 8 o a 2.0-kg object ?

  

  10.31: An object of mass hd0jx;ak z8(cM 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 ways with an applied force shown in the diagram. In each of the trials, the object reaches the top of the inclinj; hd8(xk0azce 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.