97.01: A force F direcnh nxk9 )k:lf9ted at an angle of θ above the horizontal is used to pull a crate a dihkl9)9 x nknf:stance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is moving (-0 pnj+ h:dp tcses6u*u arcl.v9cp5toward her with horizontal speed v. Whil.ssend h0t-+ a:pvlucrj(c*5 6uppc9e 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 constructio-q af:x*xxp mysr,*a(n laborer holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow:,xqm-ypas axfr **(x much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a qqr-3oz* viuxp 9tg/; horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.03gqutir x;vo*q/p9 -z J in this time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block r txsb+sj c( l49qyn)2slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy stricts+jqn xs(ytc2 rl4 b)9ly 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 2 p6;4cy,ibe0q ryg vw3.0 kg block for 5.0 4 ,wb gpyyecr06 vq2;is. 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 j0;yt7a2i p d4uctk:v 7xrfkfl0 bzy)r33+pddirected to the right is exerted on a 3.0 kg block for 5.0 s. The block was ini lz4 a;r0rf2dt xtc3k uf p:3y+ 0db7)jky7pvitially 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 initially at reston a frig9ovyo j.*, j 2;uqvn.gflz7 /)gi mydctionless 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. Wd) .7;9zygivlj*u /,v fo.j 2oggmqn yhich of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetz l6g.0f blfe*ic energy. An hour after the fan has b*zf 0 efl6l.gbeen turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg ha,j gp,:fm;ap9wr tb u(zfzm 4:s a position of 3.0 m, a speed of 4.0 m/s, and brp(fmap, mzzgw:;:j t4 ,u 9fan 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 shelf d b+h2v.2hz 7onsplz9in the bookroom 1.3 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 he do on the box. The box has a mass of 10.0 kg.2 9vshz.p lhn2b+d oz7

  02.32: An automobile engine delivers 24,000 watts (abo szc,xvs*9tz u/m dg0,ut 32 horsepower) 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 magnitude of the retar *,zsgsx0,t /d mz9uvcding force acting on the car?

  09.13: In the figure to the right, a box moves ic(jw- l9oeq,7 lj m8gwith 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 diri87w-(jc jlom , elqg9ectly 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:kqg)mjj cs;,*wwt ,ei o-xem52yhz) bottom of a rough, fixed inclined plane. The box slide;iwkqehw )y zcmx 5o2),jtmg,-:s*ejs 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 to the right, each starting from rest, along a st-da eyie l:w0xe wqd4j8xr w*83an4 i5r k87soraight road. CarA has twice thelk:-qi 8xn*ejd8 rrx0oa53ewwsai 8wy7 4e4d acceleration of Car B. After traveling a distance F, Car A has speed B. When Car B has traveled the same distance F, what is its speed in terms of B?

  12.07: What is the net force acting on the object during the timexra/r1ttws s6:uro s (i4y5 b/ interval of the accelei 5sar1x4uw(/rys:b o/6t s rtration?

  12.08: Through what distanc 5djit1qqh ja hqeo42l4 s8 phhg.:t)0e does the object move during the time interval of the accelerathj2 8t: sq0h ig41o 4aqt).pde5hhqj lion

  12.19: The magnitude of the linsi;bfq 4k 1hgm7;gn*dear momentum 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 d; ;snd4migqbgkhf *7 1uring this time interval?

  14.11: A crate gains 36.0 J of kinetic energ6w;8t h3fr; uiuk hfr2y while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of thhfrik;8u 236h ; rwfute crate

  94.38: A force F at an angle θ above the horizontal is used to pup 9l m;x)nc4ip ,*e tik6 tp4gz+g7tgwll a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor and p;i,9gitek*glg46tp4 cmtzp 7 )+xnw the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upwazv1h+jko*qdine2w8 2 rd force and delivers a useful power output of 0.10 w to raise a block vertically at a constant ev q8h j+kdnoiw12*z 2speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from h z8ow,;gl t*erest 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 b8o he z,t*glw;est 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 hardx-lh0-t.x5 xwcts b phpnj* hp,(mk*/ 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 ene*jxph b0*sp k x.w-h5(/lpnxh-tt, mcrgy E of the ball and its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The drivetb ng4;rr isz)w*f6 9wr sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude rw)fbrntz4 w6igs*; 9of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly mo-9rlli s (6funtil it stops. If the ball travelslil9r 6f-o ms( 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses bb+ wab6.u2r( vb1lffk tz5u/s ut identical kinetic energies and the three following statements. Which of the above tbzbfu2lwba 1vu. rkf5/+s( 6statements 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 jt y7(becd x9ju2nj )+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 highesndb7uyx2j(e9 j+ cj)tt point?

  06.20: A boy jumps from rest straight upward from a flat,0a udqm(xk. xvzjp9va5x i. hq8 7m8fr6 0zl.u stationary concrete surface. The boy, of mass M, leaves the concrete surface with speed 0 xzd.9560.ua 8qlk(pah q mjmfxr8.vvux 7ziv 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 boy’ s feet and the concrete do on the boy?

  02.48: An object of mass M is dropped from ah0 )w-l mfdxn4y 7zfpc-eightH 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 constfc- zl 7f 0-m4)pxdywnant force exerted by the ground on the object while coming to rest?

  12.48: An object of rjo8 nt0;cub. 5cemv2mass M is dropped from aheight H above the ground. The object boun25;t 8e0r.mnjocuvb cces 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 mass mon a cord length L : ipfv1x9 0afqis pulled sideways until the cord maa9:q0p1 fiv xfkes 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 incline of unknown anj hfqarar7-0p 7* :m.bdzby3ngle. The sled, which started at the bottom of the inclbpj : * ny3a7hr-b fqza.rmd70ine 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 original position at the bottom of the hill?

  06.09: A deliveryman moves 10 caghsn*ur2d6z;u1-u c:ollt7 z rtons 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 25 kg,z2lu7sd *lzo;6nrg1:- utu ch 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 showsx9,;vx8csxx 1r 1 1niirvp-g n 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 thgs p;n-xivrxsv,1 x 18 r1c9xie work done by the force F onthe box for the motion?

  04.48: Two identical vq h 04r9zn+mlv. b0labowling balls 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 ball A stqn0b+ la. rh4lv09mv zrikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object o aiz/6jdut s20f 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 nuda02t/j6zs iow 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 spr-dewv hlvy;0zqwo 28)ing constant of 20 N/m. The potential energy stored in th ;v-v )y82hw0 eodwqlze spring is:

  97.10: A compressed spring has 16 J of potential 0rz- uxz wot;k)hb10w energy. What is the maximum speed it can impart to a 01;xrwbk 0)u-tozzhw2.0-kg object ?

  

  10.31: An object of mab-3u;uikmq(: x 4x oru:eb(cr ss M starts from 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? Assume the same constant non- zero coefficient of kinetic friction between the incliuoibr x4:(e -r (bu:c3 qmk;xune and the object for both trials.