97.01: A force F directed at an anglez w4k 4lk9ewb w;78gmx of θ above the horizontal is used to pull a crate 87w9kw b;zelx 4gmk4wa distance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass 4uoyyh/egkit,14v 9v *hj ,k g7lvwd6m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanc7lk,dio gewuvv yv4 /6,h19yhgkt*j4ed. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holkzpkt+2i +h j1;oyy9rds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the 2+hzyy+okk ; 1rt 9ipjwallboard?

  17.11: A 5.00 kg block slid+b+a1p mck9n6ft:zlves with uniform acceleration on a horizontal surface for 5.00 s. The block’sk6 z b+:nta lpfm91+cv 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 slides wit:s8due y o/9l5ql3tazs qc7 7ah uniform acceleration on a horizontal sur5ly7u89 c:zeq qs37toalsad /face for 5.00 s. The block’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 xii 2n+w1u 0apis exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on ix1i+0u awnp 2a 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 m dh 59fozd-+cexerted on a 3.0 kg block for 5.0 s. The block was initial9ho -d +fcd5mzly 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 initiall+s 2(q ibh7yqny at reston a frictionless frozen pond throws a 1 kg hammer in one directhqi( 7+ qbny2sion. After the throw, the hammer moves off in one direction 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 ener4 k lwhp;h4a6rt0mvcz5xzy- 7gy. An hour after the fan has been k vpat;wz0-x rzmh4657clhy4 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 po,y.ounv- ewsn u(( g8q7f 1iycsition of 3.0 m, a speed of 4.0 m/s, and an accel71wu( y vieufyo qg8 (nc,-n.seration 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 1og*eti jj; moc7f. 38t.3 m from the floor. If the janit8o7tj 3 j;egt of.m*cior 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 24,6 cw: z agbj5iz*ru1v,000 watts (about 32 horsepower) of power to a uj5wbav,r 6g:iz*cz 1car's driving wheels. If the car 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/9j oqwdz 8;uo 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 u8; oq9w/jzdo 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 k rab +qqz mqrh02q323bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the incline as it is being puqar2q+2 qmk0b3hr 3qzshed 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 rest, alo( 6b(y gjd)zwong a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car B hgow(jd 6y z)(bas traveled the same distance F, what is its speed in terms of B?

  12.07: What is the net force acting m 4y)fvo wt/(f8cnwr8i3c ev(on the object during the time interval of the4tc8me(ffnr)38vc( wyw iv/o acceleration?

  12.08: Through what distance does the object move during the time interabpedc399/)gpp9 akoo xkl k )c:d)s 7val of the acceleration pdokg7kab)/:xl e3dc9 9c )k9)po asp

  12.19: The magnitude of the li/.oq u bq8+ b0mn/zsyenear momentum of a 4.00 kg point mass is changed froo/b/q snyqm u0 ez.+8bm 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 this time interval?

  14.11: A crate gains 36.0 J of kinetic enerlc(gr7w do -t,ky yl1-gy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass otw1gd ycy7-,k-lr(l of the crate

  94.38: A force F at an angle θ above the horizohepqwnkb3y,+m6 +7h ( ,ltyqental is used to pull a heavy suitcase of weight mg+mhby n q,eqhk7 ,( ty+p3l6ewa 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 delivers a useful power output of+tobqy ( dff4pcw 93*k 0.10 w to raise a block vertically at a constant speed. At what constant speed will this cranc+kyw 9tbf (*do4p3qfe raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the y44i: u,mebfq 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 obq,i4ueb m:4fyject 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 andxhtd0,pahtd3q9i :b+;) yq(pd.dzpl released. 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 ballt30+.);p idh dbzt 9 y,lq(:hxd qpapd and its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The drivxym*zewh xdmgi6 2)0 y*23iv ver 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 sto*x630wyvmeyd gm)x2 zv*h2i ip?

  00.26: A 500-gram ball m/h )efjl to*:qp/4 hvpoving at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was co fptl//*:4j)vhqo eh pming to a stop?

  02.26: Consider two laboratory carts of different massfsdai; ,j7r- at- ,-wcus+wkhes but identical kinetic energies and the three following statements. Which of the above statements woh-k7, -scij+w-; durt w f,asauld 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 tossedb6 ctb:, iqak z4 og;;n-fjq8i vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in ik:4,a-8ibfbc ;q 6t zo;jgnq its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary concret pt rwzh25cd4soz 17pyw,(:l ue 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.z:upwo5 c4,dly2w( 1p7tr z sh 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 grou)szp ,cert/(i6pywr/6+ntc zqyz 17mnd. 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 averagesctmepyc 1,z/7/ z y+i trpqr)(6n6 wz constant force exerted by the ground on the object while coming to rest?

  12.48: An object of mass M is drop /q 2sn rh7fouq)dqk56ped 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 maxosn 7qu6hd5 fq/kq 2)rimum 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 cord length L is pulled sideiw z+mjl25 :xuw 8ko)dways until the cord makes i lm8 +w5)zxw:ju2d koan 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 uniform incline of unknown angle.1r4h//eild2e lz i 4hc The sled, which started at the bottom of the incline moving at 10.0 m/s, rises to a height1z ic l4hee/rih4 ld2/ 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 n:u i+ipos5z+ 50m) j(iottq* ) lcjmyfrom the sidewalk, along 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 them to the )+t: upycis5 l 0iqjitm)+zoom*n(j5loading dock?

  12.16: A constant force F=50N iv t6k13i2,, nc -mun cpggj5i(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. Whctug m1i,vkc256j gn-,ni3 piich one of the following choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balluefpol6o)6m )gsr- +ys 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 mechanical ener6p)ls+foy u e6r om)g-gies of the two balls changing?

  11.28: A person throws an object of mass s(hck7fd90e idd l.eb nj 2)r-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 doessr)hide .lnj 72c(defd 9k b0- 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 sprm6wi:z+0n0 u2w w0)bngo maum ing constant of 20 N/m. The potential energy stored in the sprinn+i 0guw06):nuwzom0aw 2 mmbg is:

  97.10: A compressed spring has 16 J of potential 8tg7f j6 9tnhuqwx01 aenergy. What is the maximum speed it can impart to a 2.0-kg obj8 a htxjw71qg 0u9t6fnect ?

  

  10.31: An object of mass M starts from rest at the botto: zbtp3ac9p ki 654lvum 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 b9uvz6pl ia:t5 3kb4cp etween the incline and the object for both trials.