97.01: A force F directed at an angle of θ above the hy.zal5161a5q58c ehbhmc r 9sbh lp,r orizontal is used to pull a crate a distance D across a level floor. The work done by the fbq55rh6 18bsm z h5cea yhr.1cl ,9alporce F is

  97.33: A softball player cat)uo/hu b:9uux ches a ball of mass m, which is moving toward her wit/uh:u9u)uob xh 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 is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 3 met(am(iu/q 99ehvwl, x ter above the floor for 4 seconds. During (/m9v hwe ui ,a(txl9qthese 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slidesh rq,k+erf kzfj) +)h+ with uniform acceleration on a horizontal surface for 5.00 s. The block’s +fkrjhr )z f,+eq+h)kkinetic 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 acceleration nm00/xbdtpl h 4o.(2pz.fz (gp4rlg8cy yq6gon a horizontal surface for 5.00 s. Theg.(pl0po0 dc nxy8 zpz.y6lq4f 4mbgh2rgt(/ 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 directed to the right is exertednih3q0dmx 9 uz:(2ptb on a 3.0 kg block for 5.0 s. The block w n 0:p(qmi9b3x hdzut2as 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 forlpltv) 7:+ fpjtz*gm375f izece directed to the right is exerted on a 3.0 kg block for 5.0 s. The block ):ll zfp5* 3tjzt mgp7eifv+7was 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 frictionless frozen ponv pex/ 0e)w+, 4mqu/y /ykte e6hxaod9d throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direct he q6v+d epx ,tayue9/xoe4/y0 m/k)wion 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(+h rs0pej sh69j u28h 9hgj8o weg/tc hour after the fan has been turned o jhh8/( 9 ph6ejgs+wc2 tshej9g8ur0 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, lzic( rf e4y95n0/6z gtw4r qfa speed of 4.0 m/s, and an 0yg c459l 6ff( n/ 4zewrtirqzacceleration 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 stz77 bqka sj 11k)tj3ghelf in the bookroom 1.3 m from the floor. If the janitt 1jq1)t 377sbjz agkkor 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 wa/p ,t )uni;,)erzaf urf1*cxytts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 651zrxfui)at*rc p) / f,ne;,yu 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 mnm+32uxrmmk 5q,4naw;xtp , 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, ha; kq nx, mn,2m5artx4mm3wu p+s 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/swxxwh; 4h5ve3ys5k.3 vpk j)o 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 of F = 240N. The box, of mass m= 20.0 kg, has a spee .exv v4j5;5h)whk3w okyx3 psd 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 s59pp ;hsm 5;udcvebhqt b4 du/,8mf (q (pxz(gtarting 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 Cavz(5htp p5 ef4ug; p/hqbd cmx( (ubmsq;d,98r 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 intetmjs11-1ge gk/utd/d nb h -c+rval of thg-jgntekd h+dsum1/ /-b1 1c te acceleration?

  12.08: Through what distance does td, l kry(xndxasre3a /,95ap+he object move during the time interval of the anpxea59a 3l,rd xs y ,(d+kr/acceleration

  12.19: The magnitude of the linear moment d56s;(cjbd+dzlh h .uum 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 change in the kinetic energy of the 5(;hz djl.sdbc +du h6mass during this time interval?

  14.11: A crate gains 36.0 J6hgje xo2/ yu, of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Whix e,h jy6gu/o2ch one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizos,lu ;xf:vb0(e:fpiy 42vsqnh* ;ylq ntal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coeffic hq4bv ,y l:uqxy s*lpfs;f i(en:v0;2ient of friction between the floor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts nvmn*9ks 58ejan upward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speedns m9n5 *kj8ev will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released frlp6ed : t9dy 6m(cx1hwom 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 work on the object as it falls 1.00 mto the ground, which one of the following choices best represents the amxdemy9:cl1p w thd( 66ount 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 flooaw03jk 3 hnvb6r and released. Assuming thjv w3k0n3bha6at 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 and its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barrier mqy+j9g, gzb-ahead. If the car takes 95 meters to come to rest, what is the magnitude of thej zg+9- q,ybgm minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slo 2w 3n- eii/b .6gsqs7bzult bszy6*)ows down uniformly until it stops. If the ball travels 15 meters, whao q.giz7ei6-ntwuybsb b) zls6s3*/ 2 t was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masscj:e h7b dv0-(ip2 p ni99 u(ft-f8uvmo 4qpcnes but identical kinetic energies and the three following staevpcu0vcfji:q-2 d(bp 79 tnf -pu8moh4 (ni9tements. 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 clay8 kg,p :p:v8a:h d;m*ykxntk o is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is t,g8ky oa*p : kh:dx:m;tp8 knvhe change in its potential energy when it reaches its highest point?

  06.20: A boy jumps fr:w8rj,o: 6djjn9 laezom rest straight upward from a flat, stationary concrete surface.ej,jo 6d:zw: jn 8l9ra 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 and the concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH above the ground. Th )yb c::)iu hrus*xqi5ws6tv z3rf7h9e 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, what is the magnitude of the average constvyi) 9)cwr uth7 uhf*srz 6 x3s:5bi:qant 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. 0i e 1udgn x:.4.sxmvaThe 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 tmn u v.ai xs:10gxe4d.he mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sideways until the cordh -.(na(idw2 dz)clphu *p7ed makes an2h d n)i(u7lc .dzhp(*w -pdae 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 er0i7xjyx 01 nof unknown angle. The sled, which st701jyni exrx0arted 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 position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, alokhhm:q o+8 1 re40j6 ,tjemizgng a 10-meter ramp to a loading dock, whic gqj:o+t 6 ieehj 1r4,mhzm0k8h 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 thbr4zsu(z p o3qyyo ,5 ctau90(e 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 wp ysr bzutz(qo 0c43(ua,o5 y9ork done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped fro4tl7q8pqygb, c/4 p dwm 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 grqpwbg,y t7/48plcq4 dound, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upwdyr 42,sh 4dsgd hh792:xtlyiard 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 0.5gdyl9iyxs s:4d2hh4 t7 2dh ,rM rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spriz tup+)p98qggxs5 gp*o(l+aj ng that has a spring constant of 20 N/m. The potential energy stored in the spri * pp)og +z(sp gx8al9t+5gqjung is:

  97.10: A compressed spring has 16 J of potenti*pd7rhfwz1i( d( q*ncj- b9txal energy. What is the maximum speed it can impart to a 2.0-kg object ?bjfz dw1r c-qp9( xt7*i(hn*d

  

  10.31: An object of lo4 u/y+a89dkzsxpa 7mass M starts from rest at the bottom 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 re s48a+l z/p xaod7ku9yaches 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.