97.01: A force F directed at ai1y b// hcpj9 h g5;hog:+eilen angle of θ above the horizontal is used to pull a crate a distance D across a levei:hgh/ ;1 i oygpe9hb5lj+/cel floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m :h n0moje2ro-, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration2-nj:0oeh mro, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogramyxc )u6nvy9.+oz np1b sheet of wallboard 3 meter above the floor for 4 seconds.pvn yozc6+ 1)9n.yxub During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slide3,co nv,fj:ld s with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this tim: nocv ,f,d3lje.
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 horizond yt3d98xz.vktal surface for 5.00 s. The bloct 9 k8dzx3.vdyk’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 i/t-khlpz ck*g:tqo ,-s exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides o,ko/*gqttpz :l h-ck- n 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 dire, j 5mcklw n9nu.u70vhcted to the right is exerted on a 3.0 kg block for 57n uum.lh,9nk 5wjc0v .0 s. The block was initially 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 initialc0*,c6wh1p /hadc5r f1)u(d xgyb gji ly at reston a frictionless 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 followin a6y )gj( hd ucdhp*rc f1c0ib5x/g,w1g correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetir5fy 52by 8yjzc energy. An hour after the fan has been turned yb8 y2 yrf5zj5off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has a pj)b4e6tk cbn9osition of 3.0 m, a speed of 4.0 m/s, ank4eb)b n9 c6tjd 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 middle :gx k9o,ax(ssw2cb 98pofe.dshelf in the bookroom 1.3 m from the flo.bfg:cwso ae8 d(op9 29sxxk,or. 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.

  02.32: An automobile engine delivers 24,000 wa xhvslk.ty10ijr(17 l/vz*aitts (about 32 horsepower) of power to a car's driving w11sl7kx la t(.0vi/ *y vizjhrheels. 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 l d6 kou,,x7otbhw/:othe 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 inhb: o, wl,kd6x/oo7 utcline.
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/2 g7e 3h8smncts at the bottom of a rough, fixed inclined pla c3esgn m2th78ne. 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, 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;96dr 1 ;pzlvdr;vu mn to the right, 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 tral 6upvrdd ; nm;1v;r9zveled the same distance F, what is its speed in terms of B?

  12.07: What is the net force .n- xt de)6dimio:d- /wczwds 07e*aiacting on the object during the time interval of the acceleratiozo eds)n mwxi/i*- 6we.ci-t0dd: 7adn?

  12.08: Through what distance does kiuk h.t4oa30 6bqf)ythe object move during the time interval of the accelero q6ku30 f )4.kihbtyaation

  12.19: The magnitude of the linear momentum of a 4.00 kg point mas(xn(yy rr6r* ps 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 ener6rrpxrn (y*(ygy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is increasehw ee0zh2v 9-mvu: 1vvnbv vfvq514b :d from 2.00m/s to 4.00m/s. Which one of the following choice5nhf1u-bvhbzv9v2e1e4vvv :: w mqv0s best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontic(d0 r4vyxag628eyfkgr6mw*xb4 e. al is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of frictiov60(y.yrcw4e e *r bm4gax2xi6g8df kn between the floor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane ebn6 oa p7 t;dm/q,4yaaxerts an upward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raise a 0o6/t db,aa4y7pqn m;a.20 kg block?

  12.18: A 1.00 kg object is rhx4)7bww 7 gjr,qcm y4eleased 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 o b7j4)w 47ywxh,mq grcf 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 tg30o1vmuf pp k5*mc :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 and its height h p3m:t mokf0v* cupg51above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barr ::kx *qgrdf2d+ije- -usg ,zkier ahead. If the car takes 95 meters to come to rest, whauddx:-:gzjs- *re,igqf+ k k2t is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball mmfqcl-v)b+c.bk e0p8erb ; (hoving at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied whr+ f ce;vqb(8cp klbhe)b.-0 mile it was coming to a stop?

  02.26: Consider two laboratory carts of different mas 0) btpy4j+lk 7 jok49gneyms;ses but identical kinetic energies and the three following statements. Which of the above statements would bel) y9j+kgjm; p4sk e70tbyn 4o 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 verticalmlp3 acl).m,o p lx(a:ly in the air with an initial speed.m3)mp,o ( :pxalla lc 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 from a flat, stationary concr62x2zp b ca7 zus:2xjtete 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 2jtxu:x 7p2szzac b62 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 abo 2qb47wx9. x/xkrrfjqve 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 /q47jkrwxr fqbx9. 2 xthe 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 ;8(aen n ba6 7rvgr0sudropped from aheight H above the ground. The object bounces o0u r76 nab a8(;sgnrveff 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 mass mon a cord l;um8 -)tgpmuz;ckvx 7ength L is pulled sideways until the cord makes an angl mvxk;pg-zm7u)ut;c8 e
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 inclis ./ 9y9dsftdfne 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 comes to /d. d9ffss9 ytrest. 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 sidewalk, along a 10-meter ramp 8lzu1g s49 2ntzb2mlk to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a mass of 25 kg, what is the totall1ug2l2 z z 94msktn8b work done by the deliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shownqi 6+ dnifi -tiwuz(2/ 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 work done by the force F ont(+-nzq/f 2ii ti6wuid he box for the motion?

  04.48: Two identical bowling balls A and B aref)q;b du2 lf-x 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 beforuqd blf;2-xf) e ball A strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an ob -c dpy+h-l(7mpj- p a9w3vvfdject of mass M straight upward with an initial non-zero speed v. The objecty-( af7 -p ljh-pdvp3cd+ 9mvw 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? Ignore air resistance.

  96.20: A force of 10 N stre.ycg2 s5*:9teimoqq k tches a spring that has a spring constant of 20 N/m. Thec9etqkq25 miy so:*g. potential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What /qho7a to :,,.d kzulzis the maximum speed it can impart to a 2.0-kg objec d, l7z: a/quo.kzoh,tt ?

  

  10.31: An object of mass M starts fromxfl5:tjd(zr 4 mm z1 dlhd*7;u 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 would the work done by the person on the block compare for the two trials? Asd(4ult7x:dzdjzfr m* ;lhm51sume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.