97.01: A force F directed at .xo z(. edqum /q)t7hay9 7fgdan angle of θ above the horizontal is used to pull a crate a distance D across a level floor. The work done by the forc 7ouzx(haytd9qm../qd )ge f7e F is

  97.33: A softball player catches a ball of mass m, which is moving toward herobq9, 6 wjmits95 plvlh8/a6) e c6zqg with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exerted on thvqjla)58clt96 hz, 6wbismoe 96/pgq e ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 3 meter a drb4w. o(lku6x.agir04 b 9,j .fuxpqbove the floor for 4 seconds. Duri( 9,r. b qowxplkj.uu44xr6a i0bgdf.ng these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform accele* ou/86b+l6x4uyb-x c xh ysuyration on a horizontal surface forl xhsx o c4x*86yu/yb+u ub-6y 5.00 s. The block’s 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 with uniform acceleratioi(m sh(0:sb1zfghl4 nn 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 tl0 f(mhh ns 1(gi4sz:bime.
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 4xr7bv3mw6jr kg block for 5.0 s. The block was initially a63 b4jrwv7x mrt 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 tt:5fa/ab arw9 i3 urh)he right is exerted on a 3.0 kg block for 5.0 s. The block was initially at r ai5ra uwh) :r/9bt3faest 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 pond throws a )e k/uw9avw*d 4 e*pm17;zj jkf,arff 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the student moves offu;afkf4jf eem*d9pvjwz r1 w*a,) 7 /k 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 t+6m0pms s8t;dyff6 t jhe fan has been p mt66ffjydss +m;t80 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 poso5wau180 dq3v4,5b2x(ov e gvmzel dw ition of 3.0 m, a speed of 4.0 m/s, and an acceleration 58aom 0e5vo,(3db u1xqw g 4v2ve wdzlof $1.0\; m/s^{2}$ . 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 g2.rm.a4 a4 y/qpxu 2td3vmnb 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 on the box. The box has a mass of 10.xa4u. g. 4brydaq32ntmm2/ vp0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 3 5f1 ijks9 8ler/pc ii(rua,,i2 horsepower) of power to a car's driving wheels. If the car maintains ai(csu8rij 5 p 9lk,e1raf,/ii 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 onmswgjd4c 5f(bn(- )l *aar8at 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/swhen4 bg aso(*mf)5ranw8n dlc (j- 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/t3bk*0bmnud56b+wd5o n j c j 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= 2 *65u5jbwtk mod bbn3j0c /+nd0.0 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 to2j:g sqfy ;oi/ the right, each starting from rest, along a straight road. CarA has twice the acceleration of Ca qjf;igo/2:ysr B. After traveling 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 inr(oifwkqt+r)- x5v:z - r f4i7d khfiuu,5v w.terval of the acceleratq t)w:k75f f-wiu+ z-if,r4d(v5ox. vrr uhikion?

  12.08: Through what distance does the object move during the time interval oftdzu t23lhy96cwg0(d i2krx; the acceleratio(tu 3xdy;02zc lw2tg hrd 9i6kn

  12.19: The magnitude of the linea6 (dii bw-tj7cr momentum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0k jit( 6-7wdbicg.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 Jfetro q51 lkt.-xo*-j of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of -ftt or*lo.1e -q5kj xthe following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizonta1xmq7irp9cnmlsh 5 151p ct.hl is used to pull a heavy suitcase of weight mga distance d along a level floor at constt shrq hpl.1c1cm 51mip7n5x 9ant 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 deliveqzkrs bl 3:gg:s/h(ybyas 5w/ tim6;8vnf:1urs a useful power output of 0.10 w to raise a block vertically at a constann1sy irb sg6v8g:/mwt /fus53:k (l;qyzhba :t 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 surface of the Earth,jt37p p0objm e j6h6)qch5s1n 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 61eh37 tmbjs c5j qp)pj0o h6n1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a height ho above a hard 0hd x1ohd42uvfloor 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 a oxh40hd2du1vnd 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 thud8(mpp hx.a 1e car takes 95 meters to come to rest, what is p hm u(a8dx1p.the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slo7a cfr8:oe oh4:/5fpxuffp0 cws down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was coming to a stoc45p0a e:co fur 7fhfpx8/f o:p?

  02.26: Consider two laboratory cm-yf6*f2tvt0 tgv *qe8 b4zft 5zs0 pnarts of different masses but identical kinetic energies and the tt 2 fpv-5yzf64vgnztf* m80 *t q0tsbehree following 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 vertically in the air with 8v0td0i*tc aqhow m8 04-ekcwan initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highesa hqtowci kt4d0w8c*v0 e-8m 0t point?

  06.20: A boy jumps from rest straight upward from a flat, stan5:bkt9lhug4ay2 p 5vtionary 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 pku 4ay9n hbv: tl25g5the 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 from aheightH abovw y1./pddf4 yue 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 resistud1f. wd/y4ypance 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. The objetmxth6; 6mdyx3bd , io:*7wfdct bounces off of a horizodfxtt6yh;w6i :* bo dmx 3,7mdntal 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 mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord 5k: uab)wb1krks+f +rlength L is pulled sideways until the cord makes an angle b+bw+k ksr1 5u)kraf:
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 unk* d5jaer)8 ,,gtfmb ha:nbm)7i/fr oinown angle. The sled, which started at the bottom of the incline moving at 10.0 m/s, rises to a height of 3.30 m above its starting position and momentarily comes t/,mh)iai*eo 7j fr:rdfm b 58tga ,n)bo 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, alonggp)a..vrk3 ir.dnt4xvd- +pm a 10-meter ramp to a loading dock, whica3 vmd 4x.i-)dptr +.nvg.rkp h 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 loading dock?

  12.16: A constant force F=50N (as shown in the figure) is applied for t (iiiepnuz uw;k.m,0cza284t he 6.0 meter motion of the box upw c;zi.wt 4n8mi0puz,iu2(eakard along the 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 and c p p*ixx.h.)tB 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 energies of the two baxc.x) i.p*th plls changing?

  11.28: A person throws an object of mass M straight upward with an initia;z-0mid + gfnsl 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 i0-gfs; +ndzmthe 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 spring constum j:ng +uq;+k:-npwd ant of 20 N/m. The potential energy stored in the spring i -dnqw;+ :ju:g+upnmks:

  97.10: A compressed spring has 16 J of potential energy. Wh2*k,l2p6 h ezppcg it:at is the maximum speed it can ztp2i g2h ,p6*ckp:leimpart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the borbn- u0dsd4 /hid h/u2ttom of a fixed incline of height H. A person decides to push the object up the incline in one od/dn2-s/ r dh0bi4u huf 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.