97.01: A force F directed 01sil*;y /k3hchev kh at an angle of θ above the horizontal is used to pull a crate a distance D across a level floor. The work done b3ysh *iv0 1 kehl/;hcky the force F is

  97.33: A softball player catches a b9tjtrg+. gypb l 340das/v 9bball 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 hand i / ta rb.9gl yvp3+9b0jgd4stbs

  99.14: A constructioym)ji cc2 h6u7z tk964npsc:v n laborer holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the w4jp tvc )nk:m26iyz cs69uch7allboard?

  17.11: A 5.00 kg block slides with uniform acceleration on aszxwfd0.-c 6)m(xm ms horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 2mm6.s x) 0m (-fcwxszd0.0 J in this time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block sl6hf 8wi zy;7i/u2v .ga:bbi; cse-c mxides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from : ib7yaz.u2 -bci 6/x; gcw8mfi;sevh50.0 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 t rr2siq6k5(q ae2d th9o the right is exerted on a 3.0 kg block for 5.0 s. The block6r2h(iqrk5a sd 2qe9 t 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 lo2qn5 q0fg r9the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surfag q5orq9f2n0l ce.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at rktes)xlij.t4+x yl6 /edoz75 eston a frictionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction whie+okltj /y4x 7di5x6t.sl) ze le 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 enejb/p 7k;bb9y sj24;o0:x3hjd 5p djfoynp.jn rgy. An hour after the fan has been turned osp pbbb:o5;0j k.3y42 jf9xnpon j/h;djyd7 jff,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has a pbk 4+.dm+i+ fkg) vm,jfrpo6oosition of 3.0 m, a speed of 4.0 m/s, and an accelk4fmjb,f ++p.)gko ro+i vmd 6eration 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 middledjxe32:6u zs r 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 floor, how much work does he do on the box. The box ha32ur:xsj d6z es a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 wab 3ipm(b/i(88a q pryc tu;kd,v rlr4(tts (about 32 horsepower) of power to a car's driving wheels. If the car mai(8pu q /3tdvm cbp; br(raki 8iy4,rl(ntains 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 acif adfq5qe;wr4 40* m/s at the bottom of a rough, fixed inclined plane. The box sdi;c*ra5wa f04 efq4qlides 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 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 spgctb4;yv,8x foe8 *q seed 5.00 m/s at the bottom of a rough, fixed in qf 4oxc8estyvg* ;,b8clined 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 incline.
How much work is done by the applied force F to the box?

  11.30: Two cars travel to the right, eachbt)m q jgjq,tli,t4h /tf0a6 : 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 traveled the same distance F, what is its speed in m64ilthqf/gt0a t:tj, j,qb)terms of B?

  12.07: What is the net force acting on the*f6g zu12fl hhbvl2j. object during the time interval of the accel6l1 *h2l2f.gzv jf hbueration?

  12.08: Through what distance does the object move during the time intej+3w (/i lrqoyrval of the accelerr/w3o( i+y lqjation

  12.19: The magnitudez4-pec.3nw g i of the linear 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 during twcpni-ge4 z 3.his time interval?

  14.11: A crate gains 36.0 J of mb;0,m/vr * xndue,tekinetic energy while its speed is increased from 2.00m/s to 4.0dx* ut;/m0,be ,m vren0m/s. Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ aboveb m),uxbx+k9n the horizontal is used to pull a heavy suitcase of weight mga distance d along a leve+k9xu)nxbb, m l floor at constant 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 exerbhbfe)exe )tr/5 +kc,ts an upward force and delivers a useful power output of 0.10 w ) k)cxehfer,b 5/e+bt to raise a block vertically at a constant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released fr *4 ojipn8s(rwom rest near the surface of the Earth, the gravitational force acting on the 1.00 kg object by the E8*s jp o(4iwnrarth 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 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 hard floor igng1 3*4p,gvpu8hig8 8 rtg zand released. Assuming that the collision with the floor is elastic, which one of the following graphs be*8gghzgp gn8upiiv 3tg8 ,14rst 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 m/s. The drivism 069e3 hurqer sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force necessary to stop?9sr ume3i60h q

  00.26: A 500-gram ball moving at 15 m/s slows divub2xk l;74dfoa (90 snftd6own uniformly until it stops. If the ball travels 15 meters, what was the au 07;9dbkvf2fntaos(dx 6l4 i verage net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kinetic u)jvvbb 2qd wh/q) l)n0*k0o wenergies and the three following ) )uh0d)wj0* bqbvvow nl 2kq/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 vl :y9 zht*ityx -hes;:ertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential ener; t: ex yhlihzyt:*s-9gy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward m) .v4c ns xp4fr(r6osfrom 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 boy’ s feet and the concreteco6(4 vr.)pn f4rx ssm do on the boy?

  02.48: An object of mass M is dropped from aheightH above the grou dwz3jhn7j7j1 nd. 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 whilwn3jj7 1zhd7j e coming to rest?

  12.48: An object of mass M ib :-+n1 nxuzwnofnz ,8s 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 forwnx -uz:,+ nz8no1n bfce acting on the mass during the collision with the surface?

  96.38: A pendulum bob maly,810 vcj na bka)2ufss mon a cord length L is pulled sideways until the cordanyj k8a)0c1,v 2 lufb 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 unifrjxye vq98i mv0;tex 7i: ;nbe x1yh29orm 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 oxhre;2q9y ;1 inyt9i be:xx8 7evv0 mjriginal position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 10-meter rampm.( f+* ebp0 kwemewu;a08 vfr to a loading dock, which is 1.5 meters above the sidewalk. If each carton e m8w+fbvpfe0(r w.e k*0;uam 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) is9 4 u5 risto 96d-anl,tuovcx3 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 representso t4nxdv5 o-c, u93uslt 6ira9 the work done by the force F onthe box for the motion?

  04.48: Two identical bowltf3zw 5kh4x3,a htexb3 w6nz*l. yq2 fing 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 strikes the ground,hzh 4x,f63b t2xq*kefa3w.z y5t l3 wn how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straigh /-8yvb koya 2ku i m-//f9s7qtrf*rms2 cr:jit upward with an initial non-zero speed v. The object rises to a maximum height H above the launch point. The person now throws an ok8-//q c*mfum r/7y2k-avi ss2jibtrof9: yr bject 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 hd ubcqu+z;r. 5as a spring constant of 20 N/m. d z+uqc rb.5u;The potential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potentia y4xb2ocdf 1;bl energy. What is the maximum speed it can impart ty4b fc2o bd;x1o a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed inclii* :jn+d8r1gg; hha ovne 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 coefficien n+ha vj8r1go;gi* :hdt of kinetic friction between the incline and the object for both trials.