97.01: A force F directed at an angle of θ above the horizontal is g v0dost27u w;used to pull a crate a distance D across a level floor. The work done by the force F i sg 2odw7uv;t0s

  97.33: A softball player 2kfnhj((k3 yn catches a ball of mass m, which is moving toward her with horizontal speek2fyh (nk(nj3 d 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 t9/an/j9k3coyigtc , 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power t njc9o9/k, y/3igtcawas expended on the wallboard?

  17.11: A 5.00 kg b- 6r2p:h e 1yap(vdyuilock slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.r uyi:pp(e6a1 2-ydhv0 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 horizo .mrpr*9kjx z*p7ii9 pntal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J top 9z*kpjir7.r*9i m px 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 rlf56neq md1w+ ight is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest an5w+d mnel6f1 qd 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 ecc37uj+o +j-4tfl9p gao- q*is7 pctdxerted on a 3.0 kg block for 5.0 s. The block was initiac-tj - ulpao*4ptj3i 7g7fsc+ +q9cod lly 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 at reston a frictionless frozen pond thrl 4f 1cqw)-zzoows a 1 kg hammer in one direction. After the throw, the hammer moves off in one difoz41lz w )qc-rection 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 givesxm.13s-kb,a fh*+ itbm / pxjs it kinetic energy. An hour after the fan has been turned off, j bks1xmi f*+h3mtx ,s-ab./p
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 3.0 m, a speed oyo:o,5 c-6d rh .vklmbf 4.0rd mlkbc:o5-yo.6 v,h 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 i ,-;5qs8afn w cphvfu4s 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 box. The box has a mass of 10.0 kg 5f q-uvn,awfc 84;sph.

  02.32: An automobile engine delivers 24,000 wp y0h*d4w3vr fatts (about 32 horsepower) 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 magnitude of the retarding force actingf4r 0vdw3h p*y on the car?

  09.13: In the figure to the right, a box moves with spe.m6cq)n aej /qed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of ejaq/mq .n)c6the 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 m w42epsx xsj; 8icsu64oves 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 s24sju ei8 xs4;6wcpxm= 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, each starting from rest, along a strai syh+1wr3gh.)j a(gxe s /b7pjght 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 same diys/j 7+g wh g3jx).ahps1e(br stance F, what is its speed in terms of B?

  12.07: What is the net force acting on the object durinqq h/ ia5(l+clg the time interval of thl (qacli/ qh5+e acceleration?

  12.08: Through what distance does the object move during the time interval of,v +rq0d8nnlku )wd9kn7j bc2 thln vr0 d,k298nuw c7qd bjkn)+e acceleration

  12.19: The magnitude of the line.e pi: c/k:iooar momentum 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 inco/: i: k.oeip the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its spi-ds yski7v-c, glyp, se8,q4eed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of s y--p,c8k v ,sqdsi4,lgey7 ithe crate

  94.38: A force F at an angle θ above the horizontal m c.ej0 j39chuis used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of fri u0cej.mcj h39ction 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 deliverdmr*72u z tj*unyi;a)wct+ *u s a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant **;y wj+tma2)u 7 crutzn udi*speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is7;z s qhwzfy*a0,v( wc(xqxi : released from rest near the surface of the Earth, the gravitational force ac7swf h:qv*,yza xz(0 q iw(;xcting 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 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 abo,6/c)evi3r7pg 2um3ls ffl h lve 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 thch r 3m6le7l/ug vfl,32 s)pfie total energy E of the ball and its height h above the surface?

  07.06: A 500-kg car ismriqzei 3sm4 m86t;,z8b8sdbg3z7n i moving at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest,8zz mdti;3i gnq4ribs, 3s7e88zbmm 6 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.d aq/y3siy5 :;goo xfcs2n /4lkw6vhvq 7 hg.n uniformly until it stops. If the ball travels 15 meters, what wal /dycq;.5okv/whva3 26xi7 qg:yf.h g ons4ss the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kineda+ x-4 zckq9gpw5tiw dg: /)jtic en/x d-ajk5)g i+g9wp:t4zc dqwergies 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-kgballw rfrks7/0si3cl/hcl-k 1 j7 o of clay is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistancjk0i7losc- c/r7lksfw 1r/ 3he, 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,0o yolb29ojt, stationary concrete surface. The boy, of mass M, leaves the concrete surface with speed v and his center of mass rises a distan0yojob 9, 2ltoce 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 groun2yo1x.s9gjwy;42q2puxwo dwioojj 2 4,hp 9 ld. 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 negligibw;go xyopuj.9ysi224j9 hd2qwo4 p2w,1jl ox le, 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 )1 h8)pqcywoxji( r5a the ground. The object bounces off of a horizontal surface in a collision lasting time T. The object then rises upward q)1(ryjo) wc 8xhpai5to 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 mass mon a cord length L is pulled sid*df2 w4 ayv)gxeways until the cord makes a42 gvdwxy)fa*n 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 inclsf,4 nt 7i in1lznxr4/ine of unknown angle. 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 cf4n i7 sr ,xnlz41/tinomes 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 sikxljl +61 7rkvdewalk, along a 10-meter ramp to a loading docx+rv kjl7 1l6kk, 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 them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is applied for thr 14mf)ou ,ppu,snzc 8e 6.0 meter motion of the box upward along the incline. The mass of thu1r su f)4n,pc8p z,moe block is M=15 kg. Which 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 rest from tk)cu0 4c9yf9,hc gl5qh f+1kqzf r2iyhe top ou fifz 9fh 9hgk)yl,41r 2q0yk+c5ccqf 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 balls changing?

  11.28: A person throws an object of mass M straight upward with an initial 782buu8 j +ru5-r.h1 5knkngy opaqcenon-zero speed v. The object rises to a maxi- u51oh28kgp .u5uejn+ynq cr 7rakb8mum 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 strv63yu3sk -m81uqwy6; bto o 6l3o 1tstikst1betches a spring that has a spring constant of 20 N/m. The potential energy stored8o6 wtmu6o;6tb vs -q 3osyk1ky ti1s1ltbu33 in the spring is:

  97.10: A compressed spring has 16 J of potential energy. Wh thvvk6d..agxjvc*m1 .- cxi*ym l ,o3at is the maximum speed it can impart x v,vd tyj.a1c-kg*c3ih6lm.*m v.ox to a 2.0-kg object ?

  

  10.31: An object of mass M starts rc:+/ask t lm; yp0x/wfrom rest at the bottom of a fixed incline of height w;tymp/l +r :sk a0cx/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 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.