97.01: A force F directed at an angle of θ above the horizontal is used xcx8*+h/sivm8j k /onto pull a crate a distance D across a level floor. The work don/v8j/ k cnx8mx+*ishoe by the force F is

  97.33: A softball player catches a ball of mass m, which6r/j kxamxx s fre/:f .23ufo7 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 forc 7aju . x:/xf2s/fxrm f6ekr3oe exerted on the ball by her hand is

  99.14: A construction labor a usyi7m.f2c+er holds a 20 kilogram sheet of wallboard 3 meter above the floor for iaf.y 2mus c7+4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration girfj0cc9b ). on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this time.j r0)cbig. 9fc
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slid 6-vksi-l3lfees with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic enerkil-63 -lfv esgy 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 b5h5p lv v94wpylock for 5.0 s. The block was initially at rest and slides onwl5vh49 v5 ppy 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 a 3.0 kg block ,r50so1aw v6 wl3giqoh5 ip -afor 5.0 s. The block was initially at rest and slides on 6,5rhqs1w0p 5lai- vaio3 owg 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 frictionless frozen pond throws a 1 kg hbkjiy3((c . ngfas7o4ammer in one direction. After the throw, the hammer moves off in one direction while the student moves off in the other direction. Which of the following correctlf3nb 4jckyia s(g(.o7y describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. 7fh450a 3;dy7am34t jhfj mdtwjvw j4An hour after the fan has been tayf3wwt43jmm4a7j 745djjf htv ;d 0 hurned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block u s;iotji4 sxn9up;ya ++o7.bhawmlava: 3 14of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an a x: 4u;yo is7ala+4i o;u9vj3 aawh t1sm+bpn.cceleration 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 the bookroom 1.3 m from aha6em)be w yu2; /cz7the 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 e7 u6;z)2hwm aycbae/ box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 wal;e v2ceb9nox8sk/ /,8d prls tts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 3l/pk;b/d8l9 c ro vx 8nese2s,0 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 . zhg8ori 7m/p y*z q l/hk9hp/4fw;dtm/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 forcd/qzh4zil9p om7/krghh; 8./p * ftwy e 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 w9i2qdap i ss1/ 87 ;dqw e*swrnww4r8cith 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 direct4ecn 8swqpdw w r7qiiw1d/r82* s9a;sly 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 remy,t5ecgv8o*20l2o ukk f hx8st, along a straight road. CarA has twice the acceleration of Car B. After traveckgv tml ho,28* o8f 0uky25exling 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 time in(f h2e jrq44buterval of tfh qe2j4 (r4buhe acceleration?

  12.08: Through what distance does the object m:yl7w8iqtvi98rex if5bn0m ) d +wqik:zpz45ove during the time interval of the qpt0niwm:k8we4qrv dxzyi)b9+ 8f 7 li 5iz5:acceleration

  12.19: The magnitude of the v +;hco b:8rr jti2ap4,gdul*linear momentum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s :d*t4 o+ahr8bi2cr;lvg,pju in a time interval of 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 kinetp3)(q )o aqph9o.qnar ic energy while its speed is increased from 2.00m/s to aq )9roqan(.h3opp) q4.00m/s. Which one of the following choices best represents the mass of the crate

  94.38: A force F at aq n8e:gj5i-u bn angle θ above the horizontal is used to pull a heavy suitcase of w:u-jne8bi g5q eight mga distance d along a level 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 exerts an upward force and de r.lx1t.c,a 2:v9ew *kbc xik fizz97vlivers a useful power output of 0.10 w to raise a block vertically at 7:l, z.tvb.19fkacki*i zxv 2 w ce9rxa constant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the suf+x1gx-op58xx:dc 1h j;bkm x rface 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 1.0 xjx-:cx1m+1hxdx; bo8gk5fp0 kg object during the fall?

  96.18: A rubber ball is held motionless a heixb7g9c/vb0gw82 useeght ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows thewu8/ge s0vc7 9 2gxebb 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 driver sees a barrier ahead. If then:myu2;fnp8dal ql:r iu+r9: car takes 95 meters to come to rest, wnlrq:+in9 u fl2rp8adm::y ;uhat is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly i uhom: * fl0)s rwp(v(cq3f-luntil it stops. If the ball travels 15 meters, what was )ro0: wffp(lqs3-ihml u* c v(the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical ki1ggdl9ubqib/cc j b 6 4vsb3:+netic energies and the three followinggcluiqbbvd+ b1j /gc b: 6349s 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 tossdt/y 5j3s:t llaclsz0q066x u vg:zx2 ed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the changgl ydz0t sl zxals6::j/u6qvtxc 03 52e in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary e(v )jj tdkr.j,++-)hlh re zxconcrete surface. The boy, of mass M, leaves the concrete surface with speed v and his center of mass rises a dis+(r+he-jet.x,)l kzjjdrh ) vtance 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 fr .ag ob4oj)dhz8w kb*-om aheightH above the ground. The object crashes into some soft earth and comes to rest by compressing the earth a o.8oa zh4-dkwbgj b)* 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 p ums :+t/ips(*8wl,bgd bj b*the ground. The object bounces off of a horizontal surface in a collision lasting time T. The o,p*g*(um bwld tsis/jbp:b8+ bject 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 coo:+(:q lkv4raaryp 4* ekfe:v rd length L is pulled sideways until the cord makes an ana4+:fel a revy:rp: o( v4kkq*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 of5f8nx37ijd dt unknown angle. The sled, which started at the bottom of the incline moving at 10.0 m/s, rises to j7i5d3n8t dxf 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 cartons from the sidewalk, alngs jut5)c:i; ong 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, what is the total work done by the deliveryman on the cartons to move s;)c:g 5tinujthem to the loading dock?

  12.16: A constant force F=50N (as shown in tbtmz (+ce(7k:h -ntglhe figure) is applied for the 6.0 meter motion of the box upward along the incline. The mass of t(cmh7b ( e+lzntkgt- :he 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 balls Au opm )gkum6l i7:/n,e 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 ism:g6ne7m luipo,) u/k 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 straight upward witb h254vf8h yxfh an initial non-zero speed v. The object rises to a maximum height H42b vxhh8f5f y 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 spring5p;o(oknq qm*( gr* k gmaq.(t that has a spring constant of 20 N/m. The potential energt(o5.o qka g;mgknr**(m( pqq y stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the maz 4nl;wedycc 10e2qi f5 :jm9mximum speed it can impart to a 2.0-k4 21dly 9mmzcjq iw0ef: nc;5eg object ?

  

  10.31: An object of mass M starts from rest at the bott0.1r; m nvirshwy phji *h4vjh .976feom 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 incline and.rjh0r1*9;.eihfwi hm s4 p6j7vyvnh the object for both trials.