97.01: A force F directed at anfr*q4oh wuek.v7j k;76lsjv ; angle of θ above the horizontal is used to pull a crate a distance D across a level floor.kov*v 7 ljfqh uj6ew;;7r s.k4 The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is moving toward her wem: ,3nl ow(uwith horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceler lom:e(,3wwu nation, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wapegg:g3lnnd+d e. h1 /llboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was ene+gd 3dgh .el/1pg:nxpended on the wallboard?

  17.11: A 5.00 kg block slides with uniform ac kj(rgm*1-:pcyqt 7ap celeration on a horizontal surface for 5.00 s. The block’s kir7q-y akpcp j:1gm* t(netic 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 blocg*ku4h5i x 6eve;y k*nk slides with uniform acceleration on a horizontal surface for 5.00 s. The bloiek4h*ekxgv yun *56 ;ck’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 directed to the right is exerted on a 3.0 kg bl (p ub.uo6b6 1/x f7k.gmqbhqeock for 5.0 s. The block was init6 /p o1 g(uf6h.bquembkq.7xb ially at rest and 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 forc z9rsuq;1;jw 5.0 s. The block was initially at rest and slides on a horizontal su c;;q1wzr 9ujsrface.
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 wa l.:m) gl4c9zf0abz 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 a 0z :czml4baw.gfl)9 following correctly describes the above situation?

  03.14: A fan blows thew 0j(x00uolhqj(e9 3bx(caf h mpy .z- air and gives it kinetic energy. An hour after the fan has been turned of0l(zmf (jyhb.0o(u9a3 ehpcjwx x q-0f,
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 oyvpoac24 /)g0cdv+ j+, ixvijf 4.0 m/s, and an acjpdx+vvjc)gi +4y i2/ v a,c0oceleration 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 bookroom 1gp c55rp(dq3 e.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 5d5cg(q 3erpp he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 2:r hpi1*pmapz56dh8ry.v. 6q rb*flg 4,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (ab.65ihq.d:vh*z8p*gbfyr p rl 6 am1 prout 65 mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box moves with speig,bb )l 8-bzedtkwiw 0t, q,3ed 5.00 m/s at the bottom of a rough, fixed inclined plane. Teig 3) bbilwb dw-,qkz,tt80,he box slides 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 the bo*pu7 xc h :ym:a+1zy,rvr qvq+ttom 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:qvrav*+, xq +:pzy umhyc1r7 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, ol d*e*fc+ry0e.sx 7pm0mx6o 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 the same distance F, w0 +70rom**odc xpefmx.lye6s hat is its speed in terms of B?

  12.07: What is the net force acting on the object during ).mowq-gb (y jthe time interval of the acceleration?w.q)m oyjg- (b

  12.08: Through what distancdfm6.uetdf1m1 k+0v fe does the object move during the time interval of the acceleratiodvtk 1efm61ffdm+.u0 n

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass iiwy -6zya jwhy;u5;x .45qeyos changed from 6.00kg.m/s to 14.0kg.m/s in a time int; -wy6;y5i e4aojuqyzhyx.5werval 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 its speed is increase5 k*r9+3vm.pp bbc27smbtpycl b 6g(zd from 2.00m/s to 4.00m/2.b(yb6ls r p7c3b m c9pb+gpm 5*vzkts. Which one of the following choices best represents the mass of the crate

  94.38: A force F at anjz y;w(3o r5rh angle θ above the horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at c3(wj;hry5 ozr onstant 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 zerjdsg6ge/ kfj;a.is /53n- exerts an upward force and delivers a useful power output of 0.10 w to raise a blozgia5k3rg/ -6 ;dn/.sefjej sck 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 )u,mj70 blcplreleased from rest near the surface 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 mto the ground, which op,cl0 lb7mj)u ne 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+c qar,xl69y j 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 the relationship between the total enj6+arq 9xc,ly ergy 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 barrier aheabj-11/o*cd+tjh wf a -cwq9p id. If the car takesw+hjw 1botc9pj f/da1qc-*i - 95 meters to come 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 slows down*c x jt he86h18t+wulj uniformly until it stops. If the ball travels 15 meters, what was the average net force applied wu16tlh8+wjhx* 8jc tehile it was coming to a stop?

  02.26: Consider two laboratory carts of differ ez 41sm qvk)fer2o-vw0/dhd 1ent masses but identical kinetic energies and the three following statements. Which of the above statements would be csvz1d-dfhwvm)1 k e42qeo/ r0orrect?
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 thes;j0xf m5i qia 5.p) 0sbxrgr0 air with an initial speed of 4.60 m/s. Ignoring air resistanceq0gx ix. fr 5rp0amsj)5 0s;bi, 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, s. fil rj( wf;m4lx1jv6tationary 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 (; l1v irm6j(x f.lfwj4N) between the boy’ s feet and the concrete do on the boy?

  02.48: An object of mass M is dropped caw/(*f 3x5 iw xfv6fozakt* -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 object while coming to rwv /ac ffx 5-*w3o a6(*fkitzxest?

  12.48: An object of mass za nyyemnw/,w )/jd5 ( 0yol+jM is dropped from aheight H above the ground. The object bounce(l/ e0w/j5 do naz)my+,wyyjns off of a horizontal surface in 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 maq vi;ys4kz+ u-ss mon a cord length L is pulled sideways until the cord makes an a zyk i+v-4uq;sngle
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 u oiydii4 1a/u,nknown 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 comes to rest. The sled then slides back down the hill. What is the sled's speed when it returud,1a4 y/iio ins to its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 ca k6;ujy 06y.c vipn;fc6x)jyortons 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 2 y) v;.cno6ckx;i6j yjfyp06u5 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 thv4a3 qo .6ip 4ccvoe,ne 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 the force F av4p nv64oci,3 .coqe onthe box for the motion?

  04.48: Two identical bowling balls A and B are each e t.*s1tj o:kvff7lr:l 37am idropped from rest from the top of a tall tower. Ball A is dropped o:aet jv iflf:sko1 rt. 377*lmne 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 anus+4vh *:md(:bggx z w 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 person now throws an object of mass 0.5M straight upward with initi4 gsdwh::+ ug(v*mbzxal 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 constap;7 7lq c bkfz4k-tkt2kst+ g8nt of 20 N/m. The potential energy stored in the spring tkfb 8zl24kpq +ct7 -st; 7kgkis:

  97.10: A compressed spring has 16 J of potential energy. What is the maximum oc 3 + t8qk1n3xo :owp4rkzdg;speed it can impart to a3kg+ c:qo18p3z kx;tw4r nood 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incline fouli cbyp6 ) u(z79,iof height H. A person decides uifu6 9yp, c7b) zoli(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.