97.01: A force F directed at an angle of θ above the horizontal if aclf4, itgz53 up3p0c snh01s used to pull a crate a distance D across a level floor. The work done by the forcez h4uf0aci5npfcsg 13, pl 0t3 F is

  97.33: A softball player catches a ball of mass m, w b)mmts +71 n0dxqz(skc 2mn5chich is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horbc0zdt mc 2n q1snkx(7sm5+m)izontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 00d7gnd.:l qxb1a3ai) zdk26 wndzt ykilogram sheet of wallboard 3 meter above theln g iddwa0 xz)b7qda32.y0k1d:6tz n floor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform accelerat;- r3unnp: sntion on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decre :3;stnp-unnr ases 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 lse,v13a 18rpd pw:gy uniform acceleration on a horizontal surface for 5p1w,v e s :1lgdapr83y.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 direc8,oya;; uahv of3 .xnx 8tpeab3,lg u;ted to the right is exerted on a 3.0 kg block for 5.0 s. The block was initial;eu .8;oy l83x,au3gvatb; hxpnofa,ly 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 the1rxtmgkn,uq8h1m 8 e4n+ ;thfk m8fn4k .zrr 9 right is exerted on a 3.0 kg block for+ kkg,tn1;mn8 fmrr84 q xnrhm ke1u4f 8.zt9h 5.0 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 restok2awq6 hwl ((l 9esve:n a frictionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the student moves off in 9:lk (6el we(v2asqh wthe other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic ewhozb39 kr nl 4lr.p(nbin: * 5h.+nbpnergy. An hour after the fan has been 9bnn*ni:b3 .kn +h lo(rzpb phl.4r5wturned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 keelr6mu-c1t;l mh g74 g has a position of 3.0 m, a speed of 4.0 m/uc g6-m;l1l74mt heers, 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 textbooklz f:;r 5+wzmhtw rd,0 th.2nas is on the middle shelf in the bookroom 1.3 m from thwm.0;5zhna,trdwr l+fz:t 2h e 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 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepowe 4 mpesq+eet,;r) of power to a car's driving wheels. If the car maintains a constant s4e; mpte+ s,qepeed 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 (k4zp r+bc d.xthe 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, bz4 pdck+x.r(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 thehj .u7 8iqhin) 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, has a speed of 2.50 m/swhen it reaches the 7i.i8jqn)hhu 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 ody+h);nk9vvs,f 4ovtkg2p6pfe r n/vg9 i6.ng a straight road. CarA has twice the acceleration of Car B. After traveling 9g.n29ff,+;y)v i/4 k6kdrvvopng pts 6h evoa 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 ezxuszvcpy)cngh ./((97 q, mnet force acting on the object during the time interval of the acceleravu(7 c ecs,n.zpq/) 9y(gxhmztion?

  12.08: Through what distance does the obmf4ox-skg1dbcb*3,7fd 6gk bdl m f.:ject move during the time interval of the acceleratfbsbbogm1xkdf4d7.*l3m fg6,cd -: kion

  12.19: The magnitude of the linear momentum2n 01cg lbqdi0)no+rj of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in dr)q loijcbg1 nn 0+02a 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 energy while its speed is incr+ ws+rr70bdjdmy:bm6 eased from 2.00m/s tom:0yd+m sr6 r7b dwbj+ 4.00m/s. Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle ey4z5itp+ lm :2ht/vp θ above the horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between tpt +vlim e4y/ 5p:h2zthe floor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force and v1i3tu setq(nk,3d 4 tdelivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will thisn1vu3eit 4k(3st qdt, crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is releasej,r5fs e 4 gch/5/57d y an*d,oyb;i pcuhrp9wd from rest near the surface of the Earth, the gravitational force acting on the 1.00 kg object by the Earth does 10.0 J of w 4uw* ,y5 /ds ih9 5, op5rd;cyfhajec7gpn/brork 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 abo 3 cwizwb. a8wzz87ng 5-i9zv6(t phhrve a hard floor and released. Assuming that thzrhwpb863z iz7z.98i(- anwt5w c vhge 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 movinh3d 2 jke4btz2g at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what zb 2h42dt3kje is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows dow pjtoat)y;*t-n uniformly until it stops. If the ball travels 15 meters, what was the average net fo;y jp-t )a*ottrce applied while it was coming to a stop?

  02.26: Consider two laboratory carts o-ff l:tx ri f3d. 0sy3b0r6xidf different masses but identical kinetic energies and the three folld rtxyfsi:xi 30r.bf03 l -6dfowing 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 an initiae 45;nq5 wv0xhm-ku0iuh + tzrl speed of 4.60 m/s. Ignoring air resistance, wha0- 5t5nweiu r4zmh v0xu; +hqkt is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from -,o-e2fxh 2je/j;4gnfag nq vkv 0vn. rest straight upward from a flat, stationary concrete surface. The boy, of ngjvx fee0-2;qf4/a -2 v nog,hknv.jmass 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 and the concrete do on the boy?

  02.48: An object of mass M mnif*(c8-p 7ry kbvyk c*7l6 nis 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 negligible, wh pvfy(kc-76 crknb8 **inl7my at 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 theh aj: 1b7( y5j.hnlnfd ground. The object bounces off of a horizontal surface in a collision lasting time T. The object then rises upwardfnlj1 :.yhba7 nhj(d5 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 mona5l0(+shu3 w v4nsqv 0qkba xa10y;ig a cord length L is pulled sideways until the cord mxv +vi0q 1 bgs( 5k0 ay;hnsaa30uq4lwakes an 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 unknownvf*t lpev4. yych0,9lljcy w;+e0 9b q 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 to rest. The sled y.jly;ce0 few 0c,vvyp9bl h4tq9 *l+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 cart 9z3qu 9awxu;pons from 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 deli;p aq93uwxz 9uveryman 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 6.0 me,bl8ue .axf; i5ma/sr ter motion of the box upward along the incline. The mass of the block is M=15 kg. Which one of the following choices best represents the work done by thams 5l.x,aubf ;ri/ 8ee force F onthe box for the motion?

  04.48: Two identical bowling balls A a9 )0 fwrz(oaydnd 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 dr9dz0wy)af or( opped 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 straightb.1xu)lyfe(dit 3c k, 7rl 0by upward with an initial non-zero speed v. The object rises to a maximum heigyix l 3tc k,.7byfurdeb1)( l0ht 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 stretches a springs*1ym)tyi p ef,cm+,ts d2h9j that has a spring constant of 20 N/m. The potentia ep9symiy+ms fcd,tt )1,h*2jl energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the maxiauka+nc g2sw y0 -y51tmum speedw+u- ac20n syyt5kg a1 it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bobx3 r+gq*pa c46: hdrbttom 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 between the+3r : dbrgh6p*ab4cqx incline and the object for both trials.