97.01: A force F directed at an angle of θ ea9zwj2j; ,7-uybumoabove the horizontal is used to pull a crate a distance D across a level floor. The work done by thee 9uz w2;omuajb,7-yj force F is

  97.33: A softball player catches a ball of mass m, whimj 9ugg*o8c;wpu+b /2s0 shflch is moving toward her with horizontal speed 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 fb ;*spsjw2g8/ u0cmul og+h9is

  99.14: A construction laborer holds a 20 kilogram sheet of walf(iez-4q yof ;lboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the wallbqef;if (z-4o yoard?

  17.11: A 5.00 kg block sr,gz-iilcho,pub (a2 rol t))5)z +ualides with uniform acceleration on a horizontal surface for 5.00 s. Theo2z)5tbpio,az(,-guc h+rl ) ui)lar 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 uni5 jkt-(edtjd 8, zqs(il(6vw wform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.st(jd l( qzwe8i v6,jdkt-5w(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 is exerted on k )warl:8ewn1fh, po-q fy2s,a 3.0 kg block for 5.0 sqrl n-as fw:) kp,wfohye,281. The block was initially 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 dire-n6cb+ sl 0m8lf+ pyqdcted to the right is exerted on a 3.0 kg block for 5.0 s. The sb+8 m f-c yq0l6ld+pnblock 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 reston a f uqux;0s. cchwoy4b 7(rictionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one dirsq.b;o4 wh7x0yucuc ( ection 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 a; ysow6;d44gnsj /c w4+ nanhrfter the fan has been turnaj/c ;4+4dg n6wh wrno ynss;4ed 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 m,uw6+mcaoa 1.j a speed oao u1.6a+m cjwf 4.0 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 middcex6z.z pnrg(5qfm)fk-).y 0 ; 0edkh4tbeslle shelf in the bookroom 1.3 m from the floor. If the janitor rel)s5tgephe6 d(ze y kf0xzk f;l.-nb.cq 4)rm0 ocates 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 2uh2l 2zf.p9 xz2f c9rx4,000 watts (about 32 horsepower) of power to a car's driving wheels. I9 zffxh22x2zp.lu r9cf 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 5.00 m/s at the gw xyrvfyn3b(p0u/ (2bottom of ax0 (b/ ygn3fpur(vy2w 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 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 botusb;(l6u 1y04;n ra kwh h/dfx moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The / k luht yrafwb6 1d0;n4(;ushbox 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 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 l1j+.fceq +zr2dcriy :q7lv:starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance 7leidl.c+fr2r vq+ 1c zq:yj :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 o jtwqm cr60u)i a0grp59-mci:n the object during the time interval of the acceleratitiuipr0 )wcqmg:jrc605ma-9on?

  12.08: Through what distance does the object move during the time interva5gos b3v8 9)2rxiio5 pwd kpff4/fcn9l of the acceleratiok53fn vf 9pdibc9iop2rg)xf o8/ sw45n

  12.19: The magnitudeie6084v57nz ltzwje x of the 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 s. What is the cx65 v8wzzlt70 n4iee jhange 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 isgeb1/;r.nn2nwr4vf a increased from 2.00m/s to 4.00m/s. Which one of the following choices bes an.fr1ne;rv 24/wbgn t represents the mass of the crate

  94.38: A force F at an angle θ above the horizoucb7;vshj 2(h-herxx8x+ ;wj ntal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction betw7huw jrh(c2j-h eb;x8 xxv+ s;een the floor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane ep xvglmd6 /-nckq8q ,3x8cua2xerts an upward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. Algq xkducx/-q 8c8nmv,26pa 3t what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near p/8sp5qns*-x9xhh ttx0 +fj e(gmg3jthe surface of the Earth, the gravitational force smp3x8j9xjs-e h0phx g tng+t/q5( *facting 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 kg object during the fall?

  96.18: A rubber ball is held motionless a height ho above a hard fll 32h 9qp5wfwkk9ok-loor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the rwwh9op2fl953kk q l-k elationship between the total energy E of the ball and 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 edi y 121d-z,fczz ih,ei/ *apthe car takes, pz idz-h1* ,ic/1dzeiafey 2 95 meters to come to rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until itv9 i;9 9scyqat stops. If the ball travels 15 meters, what was the average net force applied while it was cominqt;ia9sc9v 9y g to a stop?

  02.26: Consider two laboratory carts of differey3hmx,: ui7+q(cil y unt masses but identical kinetic energies and the t7iy:c,qixu3 u( lmy +hhree 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 wt0g1in 8(/ qdyzd2msx ith an initial speed of 4.60 m/s. Ig8 qis2 0dmxtz(n1dyg /noring air 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, stationarn7y 3eczx xv2k(q9 p0jy 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 the motion. How(vxye x3p72c9kqj z0n 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 ahed*vjqcwdw +x5w fdg:g8 o*i04d*z *myightH 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 n0 g wgfo:qziw*8dv5d+ywx4dj* dcm** egligible, 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 ma/zgk9i 39-zponer0lxss 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 rlo0ngpie3x/9zk9 -z magnitude of the average net force acting on the mass during the collision with the surface?

  96.38: A pendulum boi(quo:7y2 a2kmsq*lh b mass mon a cord length L is pulled sideways until the cord makes an angle mykil soaq2*hq:u7( 2
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 uoqa.ugh-r 4 3s 8/bjarniform incline of unknown 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 then slides back down the hill. What is the sled's speed when it returns to its original posurj.aab og qhr 38/4-sition at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 10-meter b3ocvn5 .zwhqt9- 3 dp2k*byaramp 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 loading dockn oz vp39dc *hb3q a-k2w5ty.b?

  12.16: A constant force F=50N (as shown in the figure) is app + kqpn3;by+hxlied 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 represents the work done by the force F++p kyhn; xq3b onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from rest m0;;ozu zto;s2vl3* s0kp pmafrom the top of a t0kao zsv3ulspp ; m0moz;t* ;2all 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 balls changing?

  11.28: A person throws an object of mas/dl alzi 6w;ms9:dhr0 s M straight upward with an initial non-zero speed v. The object rises to a maximum heiga/6 0wz l:;h9 didmsrlht 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 stretcqlivplhl p9 cr/i7/in/ 8e:n3hes a spring that has a spring constant of 20 N/m. The potential energy stored in the spr/7riin ll pe:3 nvpi/9lq/ch8ing is:

  97.10: A compressed spring has 16 J of potential energy. What is the maximuj fjq8gny ku/ruyx0o4/ e*vm (/3yr:nm speed it can impart to a 2.0-kg object(gn y nj*ku38mr4/v f0o/qujr x:y/ey ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incline of u)0(u1pg nz3tw 8hai hmif2k4height 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 kine2p8w1zf4iu iha 0 gn)(tuhmk3tic friction between the incline and the object for both trials.