97.01: A force F directed at an angle of θ above the horizontal is used to puw:c n -/qsfo(fll a crate a distance wqs nc/fo:(-fD 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 toward he0htz uinj g 4+ea1k)9er with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal fogkhji t1e a)+4zn0u9erce exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard ai2pt3d; j/,8u+/tck.e 6zcdce wyd s3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the wallboardd/p.d c+u 3djea,yce8 wc;ztti6 2k /s?

  17.11: A 5.00 kg block slides with uniform acceleration ;,a 8d,z 5dopei0sqofon a horizontal surface for 5.00 s. The block’s kind is;z58,,def0 opoqaetic 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 b++zb- m9doz *9gc n3za5o b;eebv 3zzqlock slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetvzbz-eb+;9am +3 zb* ozge q3c dn9o5zic 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 directed2 b a5 3m-2whcahqs1cs to the right is exerted on a 3.0 kg block for 5.0 s. Thechas2 c-sq1 5 whabm23 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 directed to the right is exerted onk uennvn ,kkqwv3; 7/9 a 3.0 kg block for 5.q9;,kn k7w3vku nenv /0 s. The block was initially 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 frictionless frozen pondjkiz/fr:q , q6 throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direk f:6/qqirz, jction while 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 energy. An hour after thej 3ptub;c 3ke, fanjpcu3b3,k et ; has been 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 position of 3.0 m,8 8+xfkh*jesl je+1bm a speed of 4.0 m/sj18 b8 *+lee h+xkfmjs, 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 on the middle sdouu3g9zuky( 4 d.qe l0 s+yw0helf in the bookroom 1.3 m from the floor. If the jayu 04qdsg(kwy l u ued90.z3+onitor 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.

  02.32: An automobile engine delivers 24,000 watts (about 32 h-wc z /qe3c8qwc1tfu )orsepower) of power to a car's driving wheels. If the ca ce3cwt/wz c81fq)u -qr maintains 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 m/s at the b6 b9uxrnmgc (0ottom 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 ofF = 240N. The box, of mass m= 2r 0m9n(6 cbugx0.0 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 thm)p0s/a z.j i1cqg r8we 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,zsg cr.q 18a w)j/imp0 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 sw9h/ r-4iek zc/kjm +aae +9zwtarting from rest, along a straight road. CarA has twice the acceleration of Car B. After tr m 4+r e9w+j9z/c/wezk-khaaiaveling 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 intervalq uhi)u5.:nu9cj ;/wn pkao5f of the acceleration?u5).h;k qcf9 /op:nu i5wua nj

  12.08: Through what distance does the oaa554 :qtv3ggy dt1ca bject move during the time interval of the acceler 4 ttv1qga y55c3aga:dation

  12.19: The magnitude of the linear momentum )sb+vvy/) g jk.bu qsgrry82+ 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 thgs) 8bkvgb+.s/+2yr r y) uvqje change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic4y jbbd2j 5s5kljz4j/3. zff k energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents tb54jzbdk 4k /j z.f jsfy3j2l5he mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pu2 qa8:(uo7j z1nt nkrgll a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction betwee r1jnot(k q 2nz:7u8agn the floor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an up35m 5yaf ;hkuzward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will t3y5 ;af5hmuk zhis crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest nea1pmq0r4 oi c am,2o7sar 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 chopa rmiq210oo74s, mc aices 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 ballb,fof- *)m eud is held motionless a height ho above a hard floor and released ) f-mb,of*ued. Assuming that the collision with the floor is 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 driver sees a ts 1x56/it d9imvr4pyxf0g2 f barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force necessam 4fgf95tid spxr61y0ti/ xv2 ry to stop?

  00.26: A 500-gram ball movi8-psvp hda0,kd .sd,uacfo bxw;cc* u 96z1b3 ng at 15 m/s slows down uniformly until it stops. If the ball travels 15 meterd8pacs*b93 6,dcx ks;fp vw hz u.u0,b1cod-as, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different mafi ee;n+zu45oxn2f t 3sses but identical kinetic energies and the three following statements. Which of the above ;4 xi uneetf +5ofn2z3statements 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 ig 9rh yxp4f:l9n the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in4 9f 9pxyh:lrg its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward frosf,+aj3 o8cx um 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 th,os3fxuj+a c 8e boy’ s feet and the concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH abo df.,y8lx4ot4la,ro.g28, c nug gqcfve the ground. The object crashes innlu,442,dg o rlg afyq ot8f c8xg.c.,to 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 while coming to rest?

  12.48: An object of mass M is dropped from aheight H above the ground. zz;3* 1vf crjv20/xhupm n/q wThe 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 force acting on the zj/ 2rz;x1n3c v 0p*qvmwfu/hmass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord lengtz-( ujby0 6fg wmiyubs5-(in-h L is pulled sideways until the cord makes an angle5jwy nus bgyz -m6--f0ub((i i
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 uyptra l85mpqsl17p :+;o3mel niform incline of unknown angle. The sled, which started at the bottom of the inclinm3epl+poalqtr1: p85 my; 7ls e 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 cartons from the sidewalk, along a 1d9lhzl io7s.12rg; mp0-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 wg;2l97izh s rp.ml od1ork 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) is applied for the m.p yx bxf.,2o6.0 meter motion of the box upward along the in,2 obp m.xfyx.cline. The mass of the 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 bowlingyun n h6m:/6 o0gpb0xm w;9hdq 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, how are the mechanicagp;n 6xomh h nu/y9b0q:w06dml energies of the two balls changing?

  11.28: A person throws an audk :-o- lw* em2np lz77m9syobject of 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 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 point2 - - l:kmomwyla 79psu7ez*dn? Ignore air resistance.

  96.20: A force of 10 N stretches a sprifvv9vr : .psx5l1gwr1ng that has a spring constant of 20 N/m. The potential energy stored in the spring is :9v11 fw.v lv5prsrgx:

  97.10: A compressed spring has 16 J of potentiata s8(l hz,-uux ahs(2l energy. What is the maximum speed itha 8-sz2u(lht ( ,auxs can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixe)r himk. gq5g:j)af0ld 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 trialihg k) :lfq0a5m.gjr)s, 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.