97.01: A force F directed at an angle of pl5nvap :utz9e :f z8;θ above the horizontal is used to pull a crate a distance D across a l: 5l8u ;fvz zp9e:pantevel floor. The work done by the force F is

  97.33: A softball player catches a bnncev pwc)w:n.2v2 v9all of mass m, which is moving toward her with horizontal speed .9evc2c vn:w)n vp2wnv. 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 mew )b6g) nhgrvggh2 +1eter above the flooren1bgh+ vrh 2w6) ggg) for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on sab qb .82 5jp jxkrp;27kxh-ba horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this ;j2q s7k2pbra.pbh k8x5bxj -time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg bqd: c9g+t /hq a8jl+iulock slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy stca9 /d +t: hui+qjgl8qrictly 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 blockb6 q2i*t e/bnj for 5.0 s. The bloc/ t2bjqn*b 6eik 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 rig; k/j-e-f+/f t d, amxmjdmrd4ht is exerted on a 3.0 kg block for 5.0 s. The block was 4+am/ xt- d; ,d/ ejmkdrf-jfminitially 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 initiasj2:nagn, 19xj3do tolly at reston a frictionless frozen pond throws a 1 kg hammer in one direct 3daj1o,g92jsno x:ntion. 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 situation?

  03.14: A fan blows the air and gives it kinetic energy. An hou1x(:c4z- 1tbyne uebr/v4 y(mm auap5 r after the fan has 1et4r(5/ p1-uaey na4:u(xvmcb yzbm been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.+d73-8d:veguse rj vv50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an acceledeuv3de:r7sv8v j g+-ration 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 1.3 g8wf)+/kt sqtxuhhf,7y y:c6m from the floor. If the janitor relocates the box to the shelf that is 2.6 m from the floor, /6h:t8kuyyc)g,h+sf w xq f7thow 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 horsepower) of poem- v:deh j) u8v:x;urwer to ah j :x-v)re;umd: 8evu 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 acting on the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/6h79j d ipiwq04l5d kes 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 = 240Nwi64e9k0ij5qdl hdp 7. 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 bottom/tjm+vt n .r2c 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= 20.0 kg, has a speed of 2.50 m/swhen it reaches the top of the inclctr+2ntj /v. mine.
How much work is done by the applied force F to the box?

  11.30: Two cars travel to the right, each starting qibug6 rbyu k7s): (z0from 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 sa) 7b:6 rqgksbi(uz 0yume distance F, what is its speed in terms of B?

  12.07: What is the net force acting on the object durih rvvzp0:hs4c 3ni6*.w ckn g2ng the time interval of the accelv3kr* z:v0g.hpwnih624cn c seration?

  12.08: Through what distance does the obksyqr69uv/id ) 4ty4xject move during the time interval of the accs6dk qy yu49 rtx/vi4)eleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is chang8iyw/b+5mqfa o :jq9q ed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What is the chanqi5j m8bf/+oya q:9 wqge in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energ.+;m(losodo7f w2mk x y while its speed is increased from 2.00m/s to 4.00m/s. Which one of t;wm+m2oosk. o7xd f (lhe following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the rs gat68 lw45rqm n ez j4.cb8tb:0m7bhorizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficb4a m8 r5bc 4mjs8ne0bqz g6: lt.7rtwient 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 useful 6k)s339ft3gk x qzxoswg yz*+ power output of 0.10 w to raise a block vertically at a constant speed. At what consfotkz*g+3 qk syz wgxs)x3 936tant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is reoqk9qzx 0de1 fv v0g53leased 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 one of the following choices best represents the amount of work done by the gravidv01zx59 q0e3 vq kfgotational force acting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionl8qmq37zy - 9lna5r ynless a height ho above a hard floor and released. Assuming that the collisionqllmynq9y85r7 an-3 z 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 above the surface?

  07.06: A 500-kg car is moving at 28 wlvkz,xgn jvtc* m-d23 ,yvi;;gcj(7 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum averaccjl-ggzvi*w(ytkn,;x , m d ;vj327vge net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it stops. Ifi7 3 jy/ae4z(u mn(-(adnltjz the ball travels 15 meters, what was the averagz3m4djle yjn7 anai((tz(/ -ue net force applied while it was coming to a stop?

  02.26: Consider two laboratory cncj4 rudo(f4 g0a z,*harts of different masses but identical kinetic energies and uf4jg *ac0nhd,rz( 4o 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 d)np8 :naqjm bah c*ts20(2zhtossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistatdmaqj p82hz : )2(ncs *anb0hnce, 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, stationavhif/0 8ogz:w87uiz qvtd9/ mq z0jh9ry 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 averajv/g f0hu9 8 :mqd70zwtzhqo/ 8ii9zvge 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 from9dnrimq) 6nw.d8o+m u 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 magni9)u n.m6dm8+ nrodw qitude 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 re4j+y ;se2pp the ground. The object bounces off of a horizontal surface in a collision lasting time T. The object then es42er;jppy+ 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 c3litp)7xp (3ojw)zd ength L is pulled sideways until the cord )xjol3dwp z t(p 7i3c)makes 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 i a4wcce0-y/evdv0nt xh63 g i8cibh*/ ncline 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 stav3*wcv b4aiiycc06 h/0-x dnhtgee8/rting 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 fr,ikr ,vfru22b om 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 25 kg, what is the total work done by2u rr2 vbi,,kf the deliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figmz 62 r;d8wespure) is applied for the 6.0 meter m eszwpr6d2 m;8otion 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 motion?

  04.48: Two identical bowling bal)sk2i syccej w 0/na(ddqbgto90:s 6:ls A and B 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 ballb: wjd:)soqtccg0ny690 (ki se2 sd/a A strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an ob)o++i hguewcvu5l-m ; ject 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 nooeu w h)-mgi ulc+;+5vw 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 stretches a spring that has a spring cy f0dd(jss07ljx b8b g2 lu.b n3m(9ufb6eh4constant of 20 N/m. The potentiab6(nfs(3 ujlx.yg b0uhsbljef289 d7m d 04bcl energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy+rdb j d, hijb)pe)*t1. What is the maximum speed it can impart to a 2.0-kg objectd*dpb)ji1 jhrb,)+t e ?

  

  10.31: An object of mass M starts from rest at the bottwg g(3rz 4ah 2zj.e/jz(g-mb3m s2gjpom of a fixed incline of height H. A person decides to push the obj2/s4 b32r-m mhaggwze3z j(j.jp z(ggect 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.