97.01: A force F directed 1 4 fhflryb9o2at an angle of θ above the horizontal is used to pull a crate a distance D across a level floor. The work done219f fro y4bhl by the force F is

  97.33: A softball player catches a ball of mass m, which is moving jpedz6 8 flgfh 2k)y2)toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal8 pg2)y k6hze)ldjff2 force exerted on the ball by her hand is

  99.14: A construction la, 9ze-uzie :d rfc*vn2ln.+brborer holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secenbr+v 9i -2zf:ern.,lc*du zondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizontal swc:-b ilm/-njn n tv)7urface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20lj-mc : -btn)/n 7ivnw.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 acceleration on 2)1e23wn 3d tcejmyqca horizontal surface for 5.00 s. The block’s kine we1 md2jc32 t)y3eqcntic 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/gou1 12qdekn block for 5.0 e1 2dqug/kn 1os. The block 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 on azc -mui20d0- s xwje,q 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surfsq2c --w0,dui0jx emzace.
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 throws; jmp8 uvhc7e0b1qk1c 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 thj8cc17hbk0 em vu p1q;e following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. ffeh m5t69;z w An hour after the fan has been ture f56wtfh9zm;ned off,
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 mpyj4hgu4on,ehrt 3/ 5gal1/p, a speed of 4.0 m/s, and an ac 3py5oh1lj uhgna44gr/p/,teceleration 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 xj ubks ,s;dc9s/5rw0 the middle shelf in the bookroom 1.3 m from the floor. If the janitor relocates the box to the sr xdsb9ws0sk ;j,cu 5/helf 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 watts (about 32 horsepower,4a vlp4lep7-d 7 rslw) 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 m7p-radl7e4 llv ws4p, agnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s at the botza5g; emn-2b/r mg1z1z zft e5f+aa+ stom of a rough, fixed inclined plane. The box slides with cogta+ 5e1ffnmz mrsazz/2-ge+ zb5 1a; nstant 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 lqox)d 8xy vo4.8/dj ljx8fxp y+9)s nat 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/qs8 fl d) ljpd8ooyj.xn48)xvxy9+x 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, each starting from resta./0yzibuwf v3rif5c0a 2htnjm (j 6*e f:gr;, 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 trac0 5. 2 (f 3zb;iamr w0u6e/n:jh fatgjvr*yfiveled the same distance F, what is its speed in terms of B?

  12.07: What is the net fo9bi72 x gce(lw*sii3 ij +ov0w/ak6qgrce acting on the object during the time interval of the accel i x7 6i93be *+ais(w0gkc glijw/qo2veration?

  12.08: Through what distance does the object move during the tib yeuu5/hm1dyc/* )jyme interval of the accelerationmde/c)j*1 y5ubyuyh/

  12.19: The magnitude of the linear momentum of :m4i abtkxso g-;/lm/ a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval m g4bx ai:o/ /-smtk;lof 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 0(tc;hncfn w9kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. f;9 thnc0w(cn Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal8m/k(stkgzc7 h;1wlep9 8ryt is used to pull a heavy suitcase of weight mga distance d along a level floor at constaneyl8kwh /m1 k7z9t8c gstrp(;t 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 exerp(rf :f pc7mz/r5odgob*4m 3jts an upward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what conszb d7cof of4jp:5/*(r3 m grmptant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is rele:tgwj lfa* witj bfwn3(9 ly+138wlf )ased 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 thwaf3 )(lywlwn fbt *91j w8g:t3ifl+je 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 above a ha2 c ft(o:botqt3ab:3 krd floor and released. Assuming that the collision with the floor is elastic, which one of the following (cbtbo at: ktq o3f:32graphs 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 xdq+g+ ixi1zjpuzt h,;c :;p5 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minim+z5 ;c ppqgi:x;t+x zh1dj ui,um average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly ud tg (3*euggvi+ qms 3b/oszo;z v:j+6ntil it stops. If the ball travels 15 meters, whbs gq+guoe;g3v zz/*tj3(+ im6:vsdoat was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses z/3. scrf1- usfemc70dqh5d c but identical kinetic ee5.sz1-mfhu3q7c r c/df0sc dnergies 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-kgball of clay is tossed vertil a54 is0/ikfs yp4e2bcally in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its la5i4/p2esfsb0iy4 khighest point?

  06.20: A boy jumps from rest straight upward from a flat,ksc qm y6+l0 /9,lyuuh 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 nyqs l+h/u0 ,ymc6 l9kuormal 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 grounq4 ka-1c/f+kt,o(i gfsh ;snad. The object crashes into some soft earth and comes to rest by csfc /4qotgha,1a(nf ik+s; -kompressing 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 rest?

  12.48: An object of massn+gx1gr0mwj+n 6h,ib M is dropped from aheight 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 during the collision 6i 1w0 gm +nxjhbgn+r,with the surface?

  96.38: A pendulum bob mass mon a cord length L is eyj.hjgm mh,4l1nhd09c t0.b pulled sideways until the cord makes 9b0c1h mye.0j4jtmnl dhhg ,.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 b1c hm:c kcfqp 4d/i-x0g nk:2gum-4ua uniform incline 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 rest. The sled then slides back down the hill. What is the sled's speed when it returns to its orxn:mmfg0c -/4 1gk biqc -cku24p du:higinal position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons fr v9aey3et1 i/stj, r;wom the sidewalk, along a 10-meter ramp to,1j war/e3t tesi yv9; 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 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) iskfxhpo6;y a;dnj-vry a7n4 * 3 applied for the 6.0 meter motion of the box upward along the incline. The masaoy-pn v4f *yk6j n 3xd;7;rahs 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 bqg,g :ky;u6/j7jb:y asg q2eualls A and B are each dropped from rest from the top of a tall tower. Ba gsj jk2:6 :u;ggqy/ybu ,7qaell 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 y t*ic0nd/w ehhxj9lt.d: .(tstraight upward with an initial non-ze.ttld/( *cyh:xj0nwh di9 e.tro 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 rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring thatrse+47b )3-k vyj(83.mvlnw 8* qc uvafadmun has a spring constant of 20 N/m. The potentf.3jav 7 - mn(yqewu+8 *umdasb vlnr4)v 3c8kial energy stored in the spring is:

  97.10: A compressed spring has 1c9:ki0nj9k)hi.c ab eyrb td4r;a2t/ 6 J of potential energy. What is the maximum speed it can impart to a 2.0-kg object ?cbt h2abkje y 4)9ik/:i0ctrrd9 . a;n

  

  10.31: An object of mass M starts from0 lf:adn.d+mhal/pq7 rest at the bottom of a fixed incline of h+ a0fpld.q d/anh:l7m eight 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.