97.01: A force F directed at an angle of θ above the hlj )rd5-d; x1ml*qeok orizontal is used to pull a cra;-lx) j1klqd *5dmreote a distance D across a level floor. The work done by the force F is

  97.33: A softball player catchk b9l1nes )2+xgrtr. +qtwq2mes a ball of mass m, which is moving toward her with h gtb22e.1sm+txq kr 9lr+nq)worizontal 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 kilogram sheet of wallboard 3 meter 0mzgi,0ro:e+ag sfk( above the floorszg(gk: fmera0+,i0 o for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides is k,lq2hjr48l8 rp6c with uniform acceleration on a horizontal surface fplhq,j 6r8r2slcik4 8or 5.00 s. 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 o lgao2mvu((g9 n a horizontal surface for 5luvaog(m9 2g (.00 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 forc.mq9m jk,u c xflfe/m 7lz*g2(e directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slidee( 7*m f/ mmz9u2l,kqlfx.gcjs 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 t ab1 iimli,/*a. a pd0bxa.tzf,5zc+j he right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal sfab iii0,a5az*l. zjt/+dba pc1 .,xmurface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a fricte ;u+c9fou.tkho 2(g d(-tihy ionless frozen pond throws a 1 kg hammer 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 situe(( o.hk+ yg td 9cio-;2uthfuation?

  03.14: A fan blows the air and gives it kinetic energy. An z3ev 4*ufirz2 uh8i g5hour after the fan hazue5gi 3z2*i vf4h ur8s been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a bl/7r;v)rx amk tock of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an m;tv/akrr7 )x 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 middle shelf in the book;4mw:l-(llcr1 h wlvw room 1.3 m from the floor. If the janitor relocates the box to the shelf vm1 -;wl lwlchw( l4r:that is 2.6 m from 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 24,000 watts (about 32 horsep(run itr:mqf - ;-v 9gj/4kqfdower) of power to a car's driving wheel:kvrqd ntmu -grq-ff i(;j 4/9s. If the car 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 the rmkqfthd-u,v0n :bp o88 b1 (, fspkbf-ight, 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 th, pu(-on q1psv :8-kmhbff 0fbb,dt8ke 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 the.4y + nci qtbis2d0.*(nsfyiu 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 .qis0 +utyn4f(ii cd .2ysn*bleft 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 thejwr5h57 q segcknx, 89 right, each starting from rest, along a straight road. CarA has twice the acceleration of Car Bw ,jkegr95s8xq5nh7c . After traveling a distance F, Car A has 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 objecj3v 8w-d irm.ct during the time interval of the accvd8c-r3i mw.j eleration?

  12.08: Through what distance does the objeu6fv vwjf9(, zan)*b ly;e5jhct move during the time interval of the acc96anf5 hv*b(ljjw)fuyzev,; eleration

  12.19: The magnitude of the linear momentum of arac0 eos*jtx/ay,v( d +kxb8,3fl,v d 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 o fjs8x cdrev3(0,x+ yab,,tv* /la kds. 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 en 6fw8 tlj2fg()2rfyb-prohk/a -5y pnergy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best representsrr (g2h68/fpj yano-wt- pkl 2bfyf5) the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull a3z l0 fak*mk,o heavy suitcase of weight mga distance d along a level floor at constant velocitymz3 0*k,ka olf. 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 u2vfdvi u. +jy1seful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raise a 0.1f vdy u+v2j.i20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of the Earth,vdvuc v/f6:a0 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 tu cv:f/a6v d0vhe 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 ;sh tr2k 1g)n9 3wkqjnho 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 energy E o19jrw2; hnk) 3tgk sqnf the ball and its height h above the surface?

  07.06: A 500-kg car is enxs; 9xnd+c )a8eul* moving at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitu9xel)xs8 c* dunan ;+ede of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it8pl9opt2 -z dlcp w-t51i6ntp0fa8 sj stops. If the ap lt stp9-2pj wdctl581p fzo80ni6-ball travels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two labo *vxm3 bg3jz)b27htk dratory carts of different masses but identical kinetic energies andm*tz3 xg2 vb )b7hk3dj 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 air with an in)t biy;e4uis ,xic2 t;itial speeds;;tuy,xi eib42 )tic of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward fro qi ctj/sy5n7v;-: kx6nygm1tm 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) betwey1jm; qgc:7/5xv6 n nst -iykten the boy’ s feet and the concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH above the g*nhao ryjr*rutc3+. w04m*um round. 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 t3 wm a+4c*hoy .unm0jtrr**urhe object while coming to rest?

  12.48: An object of mass M is drgnzw4cb fa) d5 /wta7+lb ,w:gopped from aheight H above the ground. The object bounces off of a horizontal surface in +:tbwnf /w7al g w4ga5bd,)zc a collision lasting time T. The object then rises upward to a maximum 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 f0mt/l tqv7i2mass mon a cord length L is pulled sideways until the cord ma mttf2l/ i70vqkes 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. Thepqzrxt 65)m;ng56irm 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 then slides back down the hill. What is the sled's s;rr tmg)xipq 656zmn5peed when it returns to its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 10-meter raij oi7l*p qu481ur, xamp 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 themu*a1 o8ui,7qlpr 4i xj to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is applied for the y wo t mr-//d1b5wukwri;f- +h6.0 meter motion of the box upward along the incline. The mass of the block is M=15 kg. Which one of the following choices bu+/ot- - 1rr/dfwk 5mywh wi;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 rest froe 3le 42hbb3 c5azqtl(4 xvfj5m the top of a tall tower. Ball A is dropped one second before ball B. After ball vq3345h j bc4le5t(ba zfxe2lB 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 strhsxm8 fcaf (2/,kxl: daight 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 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? 8dkffxhc/:m ,x l as2( Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has d 8ugg+rn8z*d a spring constant of 20 N/m. The potential 8gr8d*un+ gdzenergy stored in the spring is:

  97.10: A compressed spring has 16 J of poteny8e:* vcr6hhitial energy. What is the maximum speed it can impart to a 2.0-kg object ?:hcy vreih6*8

  

  10.31: An object of mass M starts from rest at the bottom of as8(ui pe*6aax 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 tri(xpe8a*siau6 als, 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.