97.01: A force F directed at an angle of θ above the horizontal is used to pjtw -b+ ok4.vyull a crate a distance D across a level floor. The work d4o-wj. v+bkt yone by the force F is

  97.33: A softball player catches a ball ea *a- p4eq,(mz.mme m-zmku,of mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her han ,e,z -kuqeam(mp* memzam-. 4d 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 1zz6(,a j7vav cv s/ v9pds*qnof wallboard 3 meter above the floor for 4 secoz*(c 1psv , v/qs7ad9jz6vna vnds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with)ps5hq l0 )hni uniform acceleration on a horizontal surface for 5.00qhip sl5h)n0 ) s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg blocktksd80/v i3uww d-ded3,tu 6deg s*7j slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreas wdvdd j *eswt0s7-,/ 63dkdg iuue8t3es 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 rcfn/gk k:nz 1sc9;q4e+ jomy0 lpr *j+ight is exerted on a 3.0 kg block for 5.0 s. The block was initigjrljqp4cy ;+s 1o:kczm/ne+ * 9n0kfally 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 rir j:;vqxr )w0ught is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontalx uw0v;j)qr:r surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston4wyns*b yov5/r 832t t2 gsens 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 oft 2*w5tygnnves8b/ rsy2 os 43f 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 hour after rzo/f tg94*6a.nvq vo6mo1kfthe fan has bek691*onmoz r/tvqaofg. 4f v6en turned 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 poph4cahqpg6w7 j*mrk+- z9 kf 4sition of 3.0 m, a speed of 4.0 m/s, and an accelerata4wh49 6pkfgrjmc+h- zq pk7*ion 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 d z7u40rgh8* udnc4zy2 ad+dfthe bookroom 1.3 m from the floor. If the janitor relocates the box to the shelf that is 2.6 m fro u4rdaz4+87hcdgn f y ddu20*zm 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 24,00s:.ph,9yv lx-ao g) rz0 watts (about 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.9 vpl-hs,gz ay x:)ording force acting on the car?

  09.13: In the figure to the right, a box moves .nt1d5g24szexq5v hqwith speed 5.00 m/s at the bottom ofqnv1e4g z5 t.2sx5dhq 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 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 bo(1h 8ccid tsu1ttomc1 cdi8s (thu1 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 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 l9dd v-d+bn(d rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. W9 v-ddd(nl+ bdhen Car B has traveled the same distance F, what is its speed in terms of B?

  12.07: What is the net force acttp *db5cysdd7h;4(q ving on the object during the time interval of the a7vqyc*dbpd5 d;4t (s hcceleration?

  12.08: Through what distance does theg0vsj0t m vcl02y ;w/x object move during the time interval of the accelerationtx l 0j0cv/sw vg;my20

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is cha;wi d9ya082x :kbeeftnged from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What is the ;be:8x0ket adifw y92change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36j4p( cl;3ipsad60 le yp, zf,l.0 J of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the foycp0sp,i4; ( lpd,le3l zf6 ajllowing choices best represents the mass of the crate

  94.38: A force F at an angle θ above the hori.z/an/rnv v +f to,p ge:7ide+zontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor and the suitca/ +fi , n+r.pd:oveegznv/t 7ase is μ. The work done by the frictional force is:

  14.31: A toy crane exe)b5w ttedlhk -:/bo7 nrts an upward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what cons ebwd-:7ttnbk)lo5h/tant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rejewwc mu +v) bv77/:ndst 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 wom:+7 e)u vnw vdc7bj/wrk 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 motionle 1 ;z917f+jtu oi wg(c5he)dwer8cee ass a height 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 relatioehge+j)rwz;iac7ce5d( ow u f 19et81nship 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 driver sees a ba7n,:orzzerb 6 rrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force necessary to sorz:r 6ebzn7,top?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly un 8:h:wsd2i rfatil it stops. If the ball trava:rdhw i8 2:sfels 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 bggg1e-dpsqbm. 2z-l; ut identical kinetic energies and the three following statements. Which of the abomgq12g;zl.db p-se -gve 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 vertically in the air with ulse .;+r9mi ban initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its prm;l e9 s+.biuotential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight uplk q,h 7/wy1 /i-adktpward from 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 dyt, lpwh7a1 i-qdkk/ / 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 aheightH above the ground. The objuq7px*8d) ba mect crashes into s b ud*a)pq8mx7ome 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 while coming to rest?

  12.48: An object of mass M is dropped from aheight H above the ground. The objep37clkwobc9rx(0 o 53 p w3rokct 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 maoo 3 7x(or kklc r53cp9bw0wp3ss during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled s71dlrj4vxlnsm x5e 46ideways until the cord makes an angv7 n1x6e54xd4 lr jmlsle
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 om cpa21 xuz2y2g8zg) 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 momenm8ao 2ucpzgx 2zy g1)2tarily 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 movesez g- a, *9;za5ibiwsl 10 cartons from the sidewalk, along a 10-meter ramp to a loading dock, whics,z*i-9wiz gba5e l a;h 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 th:+pn rwy4plti;sb; ) rmy-:q ae 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 representsym yt) qp+p;l w4;:sa:inr-br the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each drop0 9i *hnsc+n43x9syhy4rsvg r ped 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, how are the mechanical en9y snrsr4sxg4+3n*hciy 9 v0h ergies of the two balls changing?

  11.28: A person throws an object of mass M straight u hxhcpo556e qd1s o56jpward with an initial non-zero speed v. The object ri 15h5xqocesj o5dh66 pses 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 that has a spring constant of q56svxv-zcz 3 20 N/m. The potential energy stored in the spring is cv5sq6v3-xz z:

  97.10: A compressed spring has 16 J of potential energy. What is the maxunh6u25t ry vb 4fam;5imum speed it can impart t2b4ma hyft5 ru 65;nvuo a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottou5txk.)qd fgfa/4 xd(m of a fixed incline of height H. A persontf 4)/x x(5gka d.qduf 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.