97.01: A force F directedxg *n)7rnnr3 q at an angle of θ above the horizontal is used to pull a crate a distance D across a7gn)n*rrq3x n level floor. The work done by the force F is

  97.33: A softball plc2/h v/( iq9wu6udyxwayer catches a ball of mass m, which is moving toward her with horizontal 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/ qxucy6 u29iwhdw(v/ hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wal5-2j-9g 6wnb 4xmpl thxt eei0lboard 3 meter above n 0jg6h59xtbm e4w-pti xl2-e the floor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleh+h7 xzg1 t,dqration on a horizontal surface for 5.00 s. The block’s kinetic energzx hdq7t +,1hgy 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 ayceua tg8;055 b*uvn qcceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strq;8*05g5cveyuabnt u ictly 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 kg8ki- a/k6* 8s l/2 fivikn v9jfd7avxb block for 5.0 s. The blof a-a svf2kk/ili 87xbvjk6d9v8i/ *nck was initially 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 oqu6ka6l*ndzb v/1 y9. ih3 nhin a 3.0 kg block for 5.0 s. The block was initially aty.n 6ud *kh qal9iizh/ 6bvn13 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 fokn -gt qceq y*w3v:aph2 0))orictionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the y *q otvge)cw oa0p) :2qnk-h3student 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 hour561xp +q6o ssfria cu9 after the fan r 6os qcfi 5u+61xsap9has 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 hdaz6ws5y9 tn;a ki4 m*as a position of 3.0 m, a speed ofi dn*at y94zawmk6;5s 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 w3sfa *3dbvu*g (fyxbx8j)4o.gm5 ox iyn00j 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 j04b g.f) 5 *vw xxi3md*ogsxb3 (fuo j0ay8nyfloor, how much work does he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile eng br8dg/a3d7 b9gtqx a,ine delivers 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a consta 9 3tbg 78,qg/arddxbant 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 thp bne:q0b0 :r9)vvq jne 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 ofF = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the top of the incl0qb n)v 9vq:0rnbepj :ine.
What is the magnitude of the acceleration of the box as it slides up the incline?

  09.14: In the figure to(oor,pa)xct fgb7y 17cx bpd qe55j93 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= c1x9ppb(d75)y 7j of,tab 3qgce5 oxr20.0 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 stad+7(d;ku bbi vn7 8zvvrting 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 vvdi kb 7d 7zvub8n(;+has traveled the same distance F, what is its speed in terms of B?

  12.07: What is the net force acting on th-y+uuh 1zv2lznc h/ xt d2*o9ze object during the time interval of the acceleratuz+znlvt-o y*h219x 2 z hdu/cion?

  12.08: Through what distance does the objec ,4fhfnd1 +oiot move during the time interval of the acc1 +hofni, odf4eleration

  12.19: The magnitude of the linear momen k tn*(nwn)ew7tum 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 mass during* 7(nw)knwne t this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is increased fo woey+xg0fq/(ae 8.(uuq ( xbrom 2.00m/s to 4.xoo((q(q.8a+ebfw0 / uyuxe g00m/s. Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle (apoezo.; l7j θ above the horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor and the suitcase is μ. The work done a7pjzo ;.e(loby the frictional force is:

  14.31: A toy crane exerts an upward force and delivldto pqt ,1vm/aq .4o-ers a useful power output of 0.10 w to raise a block vertic1am ,ot4po.v l-/dtqqally at a constant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg objmml/lr085kie (lb iu) ect is released 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 mkluml8 be(l 50i)r/imto 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 h lfurw+e f yca0kjlx7;l*q .1 :o(fjg)eight 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 energy E of the ball and7) l*:(wfq r;ukeycl. jao xfl0gjf1 + its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barrier ahead. If tsv(49 ch n3vynxkd(-ghe car takes 95 meters to come to rest, what is the magnitude of the minimum average net force necessary to syh (gnvscnv9d3(4k- xtop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until ito pjf/tol:q t2 + jo4)y.yue(q stops. If the ball travels 15 meters, what was the average net oyq .tt j/j+):fo pey2q4l(ouforce applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different massefsj:9ni f39pai7 l7ann;o1ay s but identical kinetic energies and the three follow oi9;afn7j1a:yn l afps9 n3i7ing 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+p0nivs + usg rh54qk md+*wa3itial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highesqsdm u 0p+ v5swi+g+3rh4n ka*t point?

  06.20: A boy jumps from rest straight upward7x ,az 7rgkscxqdn.d5d;0im8ot4d9r 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 ,a ndrgx;i7d x5qc8zd o47m90 .std rkboy’ s feet and the concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH above th4,g/ xy lxgzs*d.c/v ;f nic+ve 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 whilec*xgs;+xyvn /v/ gf.c,4idz l coming to rest?

  12.48: An object of mass M is dropped from aheidx-l) mgwox 32 j*3ydtght 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 maximum height H/2. What was the magnitude of the average net force acting on the mass duringyt-3 3gw2) xmdlod*j x the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sidewaysim - m o35l ebqs1+tz:o3cs5mk until the cord makes an a z ss5olmt+5:q-o1ec3k 3b mimngle
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,lz:3;, n de d zv5wyk,uh7 qjlu0xockj*-p-.n which started at the bottom of the incline moving at 10d-,hnejp-jnlvd30z k5q;7u w*.c xouy, z: lk.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 moves 10 cartons from the sidt,6yf *a .nvhxewalk, 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 iavf*ny x.h t,6s 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 aoa1q4kvej/o78xu e ukkz3f; * pplied 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 the force F onthe box for the mofv3k1x j4kee/uo8aq ;zo ku7*tion?

  04.48: Two identical bowling balls A and p, ln dsho ro5.f ot118mz(9xaB 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 t h.a(mo191r fxo8ds 5z pn,olstrikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upward -9xo7.tw lo+ha5cp vpwith 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 ris95 col+apxvw7.h-otp e above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring constant of 20 N/m. fam9o c) :f+i3 v:my ehn9wdk(The potk(y9cav:+i)e3f9wmo h d nm:fential energy stored in the spring is:

  97.10: A compressed s+/ypbdi 2m5jd pring has 16 J of potential energy. What is the maximum speed it can impart dmj+ 2b dpy5i/to a 2.0-kg object ?

  

  10.31: An object of mass M starts frosj6 ljt0h 0w+wm 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 incline with speed V. How wouldswh0jtw +j6l 0 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.