97.01: A force F directed at an angle of θ absrcd ute9b)h; e /xq65vj0 ; g9pq29aw,bmfwfove the horizontal is used to pull a crate a distance D acrosswmbaw09d/fq, gbc h6;9r vfqusp )t; e25e9jx a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, wr 4-2 jjk0xvzzhich is moving toward her with horizontal speed v. While bringijvzz krx0j24 -ng 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 kilogram 8om t;frb( gppjvy(1)*vhuep4h+ x9hsheet of wallboard 3 meter above the floor for 4 seconds. Duri rp4 v;t g(o)mhp+*9b1yfh8 u(xve pjhng these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleu hlbs( -w:, /majvs(kt qz*6vration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.ba-t6,zq j:v*v uw/ss((mkl h0 J in this time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides with uniform acceleration pd s.if3o; klvwn.,+non a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0;+ns d.n,ikf3p olw. v 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 directedtg7 .nosy;a/s1 sgv rpj,p0 /p to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horinjg s/y /spaspv.r0p1t; 7,ogzontal 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 md29ajt 0exs) c:9lvkis exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizol2 0 jvax d9kct:9)mesntal 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 108z vf coyq n:(c(5i:iuvouy1 kg havnc(8u:oio qv( c:0i1 yu5zy fmmer 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. An hour x-sg 8n6eo6q eafter the fan has been turnedn68qxe - gos6e 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 mlo.; 9a2 vj xrxst8frw.-x/yhtej( 8c , a speed of 4. 8tj 9hrwes;lo x-yjac.. t/(2x8frvx0 m/s, 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 shelf 8:+zn y( ytgyhin 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 onn8y+z g:(hyty the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horswuq f: 6:z/npzepower) of power to a car's drivinp/f uzw:q:6zng 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 righoa */ij4i25tgncd (r:lq0pe at, 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 blae q5grc:jo(04 p*/ di2atineing 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 bottom 33jsboou 6p6o5 s3pn jw1g1ha iie 3,zzeb)a5 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= 2oags si,uo3jhz)ep6anb 15p6z e 3 iw1jo533b0.0 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 qr8 dk/az-4ol to the right, each starting 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 Card-z4k a r/l8oq B has traveled the same distance F, what is its speed in terms of B?

  12.07: What is the net force aa 0/qt.sobbwdfk* h(5cting on the object during the time interval of the acceleratiod. h oaksqb/(ft 5b0*wn?

  12.08: Through what dista+6qxa nej*q1 fnce does the object move during the time interval of the accefxa*+qeqj 61 nleration

  12.19: The magnitude of thec :3 z2qxwax l6df)l7i linear momentum 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 lax36i qz7:dw l2cx)fs. 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 s9wfeaa ymtx*ve qufq*357k /2peed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass x*uf7 35v faaq/*9wm kqyte2eof the crate

  94.38: A force F at an angle θ above the horizont0a25 ya lvr p*;yir)bx3c-qsval is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficieaqli0; v v2s y3)y-x5 *prcbarnt 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 forz;u9 vbgw)m 6mce and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed.bm6mu;9w)v g z At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest n2c8iul2pp; 2g 8f kupzear the surface of the Earth, the gravitational force acting on the 1.00 kg object b2 k zl8gc 8ipp2;p2uufy 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 object during the fall?

  96.18: A rubber ball is held motionless a height ho above a hard floor*hg,6 3 qmni3pkehd i4 and 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 ball *q6m3hpg e,ii k3ndh4 and its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The dr(ai,zx o /u)(-mpyx hkn*tq2wiver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude2n(o xyt*(qz,u/i p w hax-)mk of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly un8ju qw g:j(awn +9fn8zcf*5catil it stops. If the ball travels 15 meter:q9jf8 jzugfa5aw8nc ( w cn+*s, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of differuy)x;rkyg7 4m (:zrez ent masses but identical kinetic energies and the three following statements. Which of the above state)xuy4ry zzk: 7rm;g (ements 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 in the air with an initialy2 , 0xou9m5l+w+)ef xo qhmuu(coa h, speed of 4.60 m/s. Ignoring acm0,(f 9+ymua) oh2eqhx+ o5u xow ,ulir resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary con ;itn9l xfg-6vnwx3 dwv-4 7n*s,pz +tbrd1vccrete 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 the boy’ s feet anwnxtr7p;n9 -x3w,cvz-b slnd+f t d6iv *vg14d the concrete do on the boy?

  02.48: An object of mass M is 21mplg rl6 dg-8f09 av+ h-diydha+iu 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 is negligi81+p2flvau+a-lg -9iyddh mi6rdgh0ble, 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 8jtadee4 5+hdq 0pfx (M is dropped 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 height H/2. What was the magnitude of the average net force acting on the m85 adfeq(p0 +ht4dejxass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled-6yr9r .t 8p.37i bewsa7s;ep zc gufy sideways until the cord makes uc-wr3pg 79ei sa.fpb7e yt; szy6.8 ran 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 inclinn 6t9u vr6wlq4s pkm*,e of unknown angle. The sled, which started at the bottom of the incline moving at 10.0 m/s, rises to a heig*upnv 6q4 skwl trm69,ht 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 m mrurc,3 l4vl5ll 97wvzxtt61, etz;roves 10 cartons from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters abovet 3w vrv9l ertzl7 rzu1c;4m65xll,t, 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 F=50N (as showp+6hj b:0gb xcbt7g4a:kqk :c n 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 repres b:76hcjtg0 k+axg c:bkb4p :qents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from rest fromft0b03bf:ajj 2 dd, ss the top of a tall tower. Ball A is dropped one second before ball B. Asaf bsj d00jd,: bt32ffter ball B is 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 *rq cohhv )9nvz*vq/d1u*;n 4k+ lwo gwith an initial non-zero speed v. Thnn1 ;o*o uv4z +h)g*rvkd qvwlh9 q*c/e 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 point? Ignore air resistance.

  96.20: A force of 10 N stref )sp9e,38*/pv5z( 3gccppl weu hl iik e+f9htches a spring that has a spring constant of 20 N/m. The potential energy stored ih3l*elk8cewge svpi pc5 i(9)f,fp/z3p+uh 9 n the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is i+;0gtny: mfaf-wnl0 the maximum speed it can impart to a 2.0-kg objec-; :fm0n0t+g nlfwy iat ?

  

  10.31: An object of mass M starts from rest at the bot. vw9svlf-4dr tom of a fixed incline of height H. A person decides to push the object up the inclinesvr 4-.dwvl9 f 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 the object for both trials.