97.01: A force F directed d 0,vp*drsqdh( d(, 6zq;mjww at an angle of θ above the horizontal is used to pull a crate a distance D across a level floor. The work done by the f, vmqz;( 60wj,rdq*s (wd dhdporce F is

  97.33: A softball player catches a ball of 99 e:nk4tgd,o9 mzijb mass m, which is moving toward her with horizontal spz9k99 o dnbtmi gej:,4eed v. While bringing the ball to rest, her hand 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 kilogramvjx-l/mp/63x vml0w / 2kssxu sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much m/wlv 0xlp2mv-6 uxxss3k/j /power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform gii+v/ij*um u 2:/nc6afr( :tkror7wacceleration 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. t:ac jo 7/mf(: ir+iguk6r/uvi rnw 2*
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block sliswrsu1ao*9+ienj)nswo 00kf.lma0 8 des with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in uew.k nn9s j0lwi0mra+s* 8a0 soof)1this 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 fo:xf,st4k.ix y r 5.0 s. The block was initially at rest and slides on a horizontal surfacet fykx 4.sxi:,.
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 rig io3m-cjypz: /;-pha kht is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on -;kizm /j:a 3p-cy opha 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 t u)f q gglzwt(kmcj70d4(:t4bhrows a 1 kg hammetc 7b((flk dq4mgt4g0u:w )zjr 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 correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. .tukb(hkda .wfe . 23yAn hour after the fan has been turnedye.(t fb32duh k..kaw 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 positiotc/+0sy 1g dcbevk**on of 3.0 m, a speed of 4.0 m/s, and an ac k ogd/10v* *sycbt+ceceleration 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 7 alvz0,hb/gxmue8xh2y j)cfvg) ; q (the floor. If the janitor relocates the bovv7f(al0uy g)xjqhb; hgc,)82z x em/ x 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 24,0lq8c go;*if0 h00 watts (about 32 horsepower) of power to a car's drivingfq* 8ciolg;0h 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 r4:qxz;y9e7 ev4dx gsaog q68 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 ofF = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it re9d4orqsv 7z:6qgx4x 8y ee;g aaches 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 ri4ew/w:zaah8 pa 7vzfukhg46+ ght, a box moves 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 pwa h4z6 v7+8gauz:a/pwfhk 4eushed 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 startiyy43h r qmmn r:3m*.cbjv6ht2ot 50b1olq d/dng from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car B has traveled the sc2dn4mm:h l q/b 106v3oo y qb5*hyt mdrjrt.3ame distance F, what is its speed in terms of B?

  12.07: What is the 3: zasfs:z2fz- d e1kcaj8r.qnet force acting on the object during the time interval of the acceleraaa 8-:dsz:j2q ekzcs 13f zfr.tion?

  12.08: Through what distanc (lobao29 /gw)fp( obye does the object move during the time interval of the acceleratiobo9ologf (2)(y /bwapn

  12.19: The magnitude of the linear momentum of a 4.00 kg point mas48yj prc3da3-u gh0 j c9q/sbss is changed from 6.3qhgjc-bj4u y8pc0 /9ards 3s00kg.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 ,3sk v773yy)ix4ubf-t oib sy36.0 J of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the foll y t3f4-)i3yx7bsbkoi v7y s,uowing choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizon2(*dg(mlf dty tal 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 suitcase is μ. The work done by the frictional for(flt* dy(2dmg ce is:

  14.31: A toy crane exerts an upward force and dx384mi,i cj4t-km- +hjcpr qvelivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raise a 0.20 kg block?,c- iv+r3xhj8-t4 m j4qkimcp

  12.18: A 1.00 kg object is released from rest near the surface of the Earth, the pvgo54edyu+o)+rdjvj vs.g e).7 z4d 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 eyer vdv+u74vzo )gosdd.p ) jj+5.4gkg object during the fall?

  96.18: A rubber ball is held motionless a height ho above a hard floor and rd fo6,k5rtpd+j :xh hv6 *gx3celeased. Assuming that the collision with the floor is elastic, which one of the folloxf:rp gox tvd6 ,6* hc+k5hd3jwing 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 a x j6otmdbd 0nmgm7850t 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force 0n0gtodmxdm758jb 6m necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly unt f;.py6 eqr:0 nrul0odil it stops. If the ball travels 15 meters, what was the average net force applied while it was coming tfry l:rodq e6p0.;0nu o a stop?

  02.26: Consider two laboratory carts of diffeb -ubiji-2:z6dqt)sn+yw+ uqrent masses but identical kinetic energies and the three -:ubsbz qq- nu+i2)w+i djty 6following 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 tossed verticaettzm7cq lu.vk6:l /yd2n-- dlly in the air with an initial speed of 4.60 m/s. Ignoring air resistance, whuld /t- vnq2em:.dcz7 ylt-6kat is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight/ 2anylmkz:4i upward from a flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface with sma n:klz2y 4i/peed 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 the boy’ s feet and the concrete do on the boy?

  02.48: An object of mass Mn;(1/k8u c5cqyth eu97hsy8 sn orl+a is dropped from aheightH above the ground. The object crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Assuming that air resistance i 7t9r; 5chnnse8oyc8 qyu+sa hl/(k1us 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 d)j1b 8zi h0yidropped 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 maximum heihidj y8b0 )z1ight 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 3mt+p8w-e: dlvl7 fpd cord length L is pulled sideways until the cord makes an ant3ev :dm8-d+plf w7pl 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 unknown angle. The sled, which 8.;7ptiuts .r/ieyb*hrjvheqd r *)2started at the bottom of the incline moving at 10.0 m/s, rises to a h)u;7*ejrt8rp/ .biq*s d.vyht 2r iheeight 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 im g4pg 3kd*3d(-p* zog s-lmkg6iv5 gsidewalk, 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 deli g3kl(d o3zg4ikdpsg gvm-g*6*-im5 pveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as showne pfpx:,uhyei4/ z-t* in the figure) is applied for the 6.0 meter motion of the box upward along th-4et*fh ye, u /pz:xipe incline. 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 bowling balls A au. hn)s 5b4bccnd 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 thnhc)4 u 5csb.be ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight ue /zf7c(8ya tvpward 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 a7y8vt/acf ez (bove the launch point? Ignore air resistance.

  96.20: A force of 10 N stretchespol4 eyr,zl r37cf1 t/ a spring that has a spring constant of 20 N/m. The potential energy stored in te pfll74 oy,ztrrc/ 13he spring is:

  97.10: A compressed spring has 16 J of pod+c jv*/ 2hthlkcfp*o8ku. :otential energy. What is the maximum speed iohf + ukt.kl8joc d/v2ch:p* *t can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fi e/8za/rwf3; zgyq5zfobs+(b, co8 fyxed 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 t+35b/cef8f(or f,y y gzoqa/w z;b8szop 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.