97.01: A force F directed at an angle of θ above the horizontal is used akyfdfel tm;a-m* ukl5,e* 5-2 7kwyg to pull a crate a distance D across a let5*7kd e5 fy2-*uya;-ewg mlf,l makkvel floor. The work done by the force F is

  97.33: A softball player catches a ball of massg.dbu9si8 z5je1.ju l m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleratione.sgj b91ljud i8uz 5., the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 35pbh7kz6t0i s meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the wallboard0t6bs5kh 7ipz ?

  17.11: A 5.00 kg block slides with uniform accelz5nf-yu1qm5 u eration on a horizontal surface for un m1u5qf y5-z5.00 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 block gmtfvirc mk 8:l)*8 s,slides with uniform acceleration on a horizontal surface for 5.00 s. The r:sg 8 *k8t,)m cfmlivblock’s kinetic 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 block f2g-cgrfz8 i3 9uutw 6xor 5.0 s. The block was initially at rest 6xzgui-c93wt gr2 uf8and 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 exew5+)zeazz. w(1ni8yzexy -os rted on a 3.0 kg block for 5.0 s. The block was initially at rest and slidezwion- eeay1 (+wyszz )x58 .zs 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 frictionlesym2 yxg(x o- 6fu8ve4,p)4er8vdhd wfs 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 uh8e, o)x2gyv 48dfwp4xdv (me- ryf6other 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 the f8t(a )ppm /7j-yz rpsuan has b-p rpupzy/(87j) matseen 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 pos fc- tloa*uw. x092 mha fnz,a;:av3ijition of 3.0 m, a speed of 4.0 m/sc omlah20n afaxv*i-93z u.jf ; w,at:, and an 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 sc0tkd:k(m;do:q. )cg f9w s von the middle 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 has a mass o skckwmq; t: f:cdv.o0 s)9(dgf 10.0 kg.

  02.32: An automobile engine delivers 24,00 wxgsr5bz)*a j0;cn8 i0 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 retardinx ;rz5i *g)0wacbns8 jg force acting on the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m2rm6.gb5p*e itfd 1 zri;pcj38pz iy:ol2yz //s at the bottom of a rough b5fri pz zzlpoy8m/21.:ipg i*rjy36c t;d 2e, 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 mr5*brd wo d9-uoves with 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 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.or9-d*wu 5bdr
How much work is done by the applied force F to the box?

  11.30: Two cars travel to the right, each st17j*l awg s kpu-mu85 g)q-iazarting from rest, along a straight road. CarA has twice thgks a 5uwa-z8*q7j)ig1mp l-u e 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 6.wt9:plfl(8z r;w-c kupz-yny: ef iobject during the time interval of the accelerat8pwft :r:;-9y6-(k fcie pzulny .lwzion?

  12.08: Through what distance does the object move durv5qiu6 fgn9n fl 65.boing the time interval of the acceleratiugl 5nfo fnv9 65b6q.ion

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is changeox.dl7 a wun 7a8h/xoz 0wsg2ui8)7nk d from 6.00kg.m/s to 14.0kg.m/s in a time interval olsdnno)8w.z20 xwxu u7 ha8ik /a7og7f 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 kinetic energy while its speeqdn2- fol f*7at 4+gjd*gr ev1d is increased from 2.00m/s to 4.00m/s. Whicq vg21+*gtr-da*f ej47fno dlh one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal isnab7m0twx :5(.a vo4thhro7 u used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floorxhm0a5bvto7 o(nu7 wta4r. :h 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 uacqn:xvlup ( :+tf )b9seful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this cran(: )f qup:bavx 9lctn+e raise a 0.20 kg block?

  12.18: A 1.00 kg object is relh6q e; 77i8uvyr;tgyyeased 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 gravitational force acting on the Earth by the 1.00 kg ouev7q; y yr7i6h8ty;g bject during the fall?

  96.18: A rubber ball is held motionless a height ho akyy+hshe8xcb(c93eugg 24* 5xi;ew wbove a hard floor and released. Assuming that the collision with the floor i3s4 2u ygw+5h; y( x9k8i ehcb*ceegwxs 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 m/s. The drivey; ;ucub u4oyx4fbovm96 9hn(r 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 sto4;bunum9y v4xy(of; h 69bucop?

  00.26: A 500-gram ball moving at 15 m/s slows downi,)f.0h q3xme2f vq7x1p vr l5ixuvb9 uniformly until it stops. If the ball travels 15 meters, what was the avq,5p.vfq9 v1 mriuvx70x3 )l 2xhfeiberage net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different ma* j93nuj,fgg4 4z :es)wwqw*.7j1 envlvtt aisses but identical kinetic energies and the three following statements. Which of the above statements wouldjw)eli tg7v e.n:us3j9 jqg41 4w*atfv, *zwn 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 z 4:ygn kugz18/cu n:aclay is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, wh:n:zkc 4nu/z yga1 8ugat is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps fromx 7 fn*r+bke;ipi9,vs rest straight upward 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 d to the highest point of the motion. How muchbs9i fix rv+,* pn7ek; 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 obz2kgbe 8-wx,dup.s2fa(kog u-0nbl2ject 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 magnit02k2l -.8kb ex,g -u2 ug afndb(pzowsude 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 ah1kqri67suj w18xu wl zx-di3)eight 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 wxdlrw6 ii7xwk u)1 -zs8q1u3 jas 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 is pulled sidewayshils:du-3k2nxo, hmowsy5 . n0lc;z7 until the cord makes an an mihsdh3,0.cz 5lnlnx:-uywk2o;os7 gle
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 unknow+nv(gejsxrj2j2 v9i 0 n 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 tjx j 9vgr0v(ij2 2sne+hen 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 movep9dl8my-+ va+a 47fiyrf3wf ms 10 cartons from the sidewalk, along a 10-meter ramp to a loading dock, which isf3+9a+8fpmvwy l-a7md r4f yi 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 F2i sca1qh84a f=50N (as shown 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 the woa41haqi 8fcs2 rk done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each wq+-w; mxp.zrm4 jn( tdropped from rest from the top of a tall tower. Ball A is dropped one second before ball B. After ball B is dropped bpwn .r4(tq j;x z+-mwmut 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 straight u w/b*sqyma ;t5pward with an initial non-zero 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 maximumqsb5a tm;/ w*y 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 ha p-8-tskaf1zks a spring constant of 20 N/m. T-fp -zsk1 kat8he potential energy stored in the spring is:

  97.10: A compressed spring has 16 J of v m0qf l;h 8uc-xb:9kmpotential energy. What is the maximum speed it can impart to a 2.0-kg obj-umhv9 fm:0x ;k8cql bect ?

  

  10.31: An object of mass M starts from restyx-.qrycfj.hmm 2*7yz 8v e:w 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 bloyej:8 2vfqcmy.hz.y* -x7mw r ck compare for the two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.