97.01: A force F directed at an angle of θ above the 34np;kgg) fyshorizontal is used to pull a crate a distance D across a level floor. The work done by thk;)pg43n fy gse force F is

  97.33: A softball player catches a ball of mass m, which is movi.q8isd+ l/f w 2zb1ogang toward her with horizontal speed v. While bringing the ball to rest, her handzl1+dab/w2fo q .s ig8 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 kilogram sheet of wallboard 3 mete4y( jmyue9jc/ piw:3 dr above the floodcejpi4yw:m 9u(y j3 /r for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides w4 bx/m t;fmw/ oqw*:vhith uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy /qwt*hbmvf4/ : xowm;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 ac/)r t 7f4tnyks /r:eamceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decrk/fm7r) eyns/r 4tat:eases 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 rivoy )0 ntanj4 ( kv5qkfi:63haght is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest ana4 0 vnqfi vao5)( 6nkyhj3kt:d 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 force directed to the right is exerted on a 3.0 kg block fovy6ro lynyl8 z 0pe(il49:8anr 5.0 s. The block was initially at rest and slidesl el64 pzv9naoi0r88yy: (yln 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 f6,jwf)rk8n bia, ljxec:k70bzh v3 ;prozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one :x8k0;nzr l36vj7fjp k)hic ab ,,wbedirection 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 after the ukgi3.z: w49wrabsuj(v,er (a7fcq (fan hasu:. v4r 7uega(93jr((qwsb i kzaw,cf been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has a position of rs/s50 m a,pbp3.0 m, a speed of/m5p sp bar,0s 4.0 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 textbooks is on the midh um:q8ipko c u9(l.t2dle 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 the9.p8 : ihtlmuoq cu2k( box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 hors neten0(iko :nu4oi 8s,fua,,epower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65 mph), what is the mag,n,uenea is0fko( t:o,nu8i4 nitude of the retarding force acting on the car?

  09.13: In the figure to the right, a bojmach g)l37*2kam-w fx 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 direct73j)c *khwl-mamfg2a ly 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 toefdxreh(q m 2/y 8:p;bcebbc b;677uo 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 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, hasb 7p qy 7ebom:c(h6d;/fxber2cb u8;e 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 from res, )t ) ut9sfh s,o+ydlgxiz;n0t, 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 the x,z9ts0n ty f);d,hu+g ) ilsosame distance F, what is its speed in terms of B?

  12.07: What is the net force acting on the obj0l s0a a)jtzkqweh -l5, ycq7,ect during the time interval of the , y zcljh,- e5sa0qaqtk 0l7w)acceleration?

  12.08: Through what distan-317h *: zki fbkekniwyp).ioce does the object move during the time interval of the accelerati )7pn.yk-kf3k:i o*i1wezbh ion

  12.19: The magnitude of the linear zdcd8y:g8rp-01mqr0e c ; dkwmomentum 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 massqp 0 g ckdm;rd8yw 1c08-dez:r during this time interval?

  14.11: A crate gains 36.0hishimq/u:s 4 0;f*nn J of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents themunq:f*/ i 4hssn0 ih; mass of the crate

  94.38: A force F at an angle θ above42 gfzjjz .wymc0e; m06jn/kb the horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor 2jg 4nem0/b z ;kcz6jy0mj.wfat 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 upwaws m l8zuva:oy.q3(i3 rd force and delivers a useful power output of 0.10 w to raise a block vertically at a cons woz3ui3lv8:.q(amy stant 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 s(4 3j8,j qr* zb 3j/kaintvflvurface 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 mtoba3 rnijzl38,kq4 t j (*fvj/v 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 heq-t+/ij i+o u f 599/csbrmrzild 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 qiosumbi95rirjf/c -z ++ 9/ tthe 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 driver sees a barj) : e-/bmzzqnrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average j-)e: qmbzz n/net force necessary to stop?

  00.26: A 500-gram ball moving at o46.xjwjiu ue7l+m5 p15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was cj7p 4jiwou +5lm u6.exoming to a stop?

  02.26: Consider two laboratory carc6tt*tu moz9efu kj4c6 4r:(o ts of different masses but identical kinetic energies and the three following statements. Whichc6tz9o6o :f 4tr(ujm*u teck4 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 air wiwjiq*:0x rvlpau685 oth an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its pot0 5xalw uq:v*6pir8jo ential energy when it reaches its highest point?

  06.20: A boy jumps f+ux rmode qqt4 ve,399rom 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 and the concrete do on theq+4tu,3x99 d evqomre boy?

  02.48: An object of mass 9 x2wponm6 6is4mjd t(rbd/w-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. Assumi4b6-6oidmpdj (9 wmx w2/rntsng that air 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 droppedqv9 /*s )0egifjrqm8 y 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 maximv*q/9g qm0ryjes8i f)um 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 sideways hk;2ftyc/hjdj e70x8 until the cord makes an ang/ 8j; 2tc7xykhfdeh0jle
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 incli /ixiqj2k,buih31 ;;vskm, bg ne of unknown angle. The sled, which i1 2,skig;x h/ u3kqibjv, b;mstarted 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's speed when it returns to its original position at the bottom of the hill?

  06.09: A deliveryman,e rrp8w *)podz9mxl+ moves 10 cartons from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carr,9*+ wlrpmox) 8pzde ton 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 (a0jc*fa 1bgyen zw- v+s0fu;3ys 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 f0wz+ag 0y-uyv e*sb13c;f jnwork done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B rij c 4qpjte-(n9 ;2jlare each dropped from rest from the top of a tall tower. Ball A is dropped one srp9 t ijj4n2e-;j(l qcecond 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 an initial non-z: b5sz 0g8 */njya6bu zbv1qkcero speed v. The object rises to a maxi bjzna/uv cs qb*61z85y: bkg0mum 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 an -7xj*wqnoji * -k*iy19jrjv spring constant of 20 N/m. The potential energy stooj-r1* 7n ivxkj wyj j9*-*nqired in the spring is:

  97.10: A compressed spring has 16 J of potential energy. Whusa vtf :7uq3 4g/*t hestq.m,at is the maximum speed it can impart t3/m7,4 :gtah f*tuqqs v uest.o a 2.0-kg object ?

  

  10.31: An object of mass M staj2qfwb7gd/fun7c02fj (k dpxe) jyszbg .(;7 rts from rest at the bottom of a fixed incline of height H. A person decides to7; 0c x /gj(2 jbz)ff du 72edg.fbnkq(pwysj7 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 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.