97.01: A force F directed at an angle of θ above the h6;p esqlt4w9f3+w jvp orizontal is used to pull a crate a distance p;3qfwlj tp9 +ewv64sD across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, +nfdv)kg+ *fb which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the hg f)+fd kvbn*+orizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 3 meterz :uchwura8z,tw .1g5s(m/ mz above the floor fo5tz ah 1z8cww/m rsm,z( :.guur 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform a zjwamzyi2 p1,*p0ydfl/ 2kr q7r;hz8cceleration on a horizontal surface rfm/aq *jwz0zz;i82r 1k dy7,l2php y for 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 acce 249 qi/zduylfjsuh7lh ldq 2t04.,vg leration on a horizontal surface for 5.00 s. The blockzq7d4s2ujit9 v04dq lf lghu2y./ h,l ’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 cvtl1cj;f:9 x 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 horizotjcx1v9 :l;cfntal 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 is exerted,o xecnyyxrl2/pi o3j0.x*y 0 on a 3.0 kg block for 5.0 s. The px0y3 y *ej0n.o ilor/ y2,xxcblock 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 resgce3a4um*4y . tex(kpton a frictionless frozen pond throws a 1 kg hammer in one direction. After the throw, xu cg 4pk.e4ytea*(3mthe 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. Aik 2-lxsq(y3ya 38s iin hour after the fan iya2ysi-l8q3 ks3(x ihas been 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 aoc9mx*qf./cx : a:uondql7 2ns as zq4j+71s g position of 3.0 m, a speed of 4.0 m/s, angfd/+ 1: n.aljqu9aqcx2*omsnz : css7q4x 7o d 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 in the bookroom 1.3 m frcyta s1 *bsss,buqj oc3 g3-stvu-0:gn 6.c8dom the floor. If the janitor relocates the box to the shy.:0g-a u ,- cs3 tqtsbco1unvgsjc3d*6sb8self 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 horsepowealt(kp 80g ac cx14xi 4g7;fozr) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (abotp g0fi8c4oaclg(x7;1x4 kazut 65 mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to thkkd:(x+ 8/s 9a/zmnrj/d xgz / f.jjjqe right, 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 being pushed directly to the left with a constant force ofF = ja f/skjz r9j kdmj q+xn:/z(/g8.dx/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 bozmn/u)s 4p5mw y et(l5x 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 lsu5z( n)ty p5mw m4/eof 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 riee8 y3bk o70dhght, 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 Car B has traveled the eb8dy370eko h same distance F, what is its speed in terms of B?

  12.07: What is the net 5q( ijd( sen c1e)8ajxiu8frdw z;bf+;b+ su*force acting on the object during the time interval of the accxe8(ib d+wdfc+5 ) ;bru*uja(e 1 jqnsz;fs8ieleration?

  12.08: Through what distance does the object mou: e4h.,ztlwby05 i wave during the time interval of the acceli:l.0haywte zu4b,5 weration

  12.19: The magnitude of the linear mtesuu 2* 1l+ddomentum 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 mass during this time intl *2 dtueus+d1erval?

  14.11: A crate gains 36.0 J o3,wg dv1l:+on,ivo4 9p jckni f kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of the craic1+k 3 op,,vln wdjnv4i9go:te

  94.38: A force F at an angle θ above8 s7sc(4w bc4 /5sb(ccqf uvfz the horizontal is used to pull a heavy suitcase of 5(cbcfv 74/ ssqbuc wcz (4f8sweight mga distance d along a level floor at constant 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 upwarduxrqc *4tn -w0 force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raise a n0q t* cwrux4-0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surfacet c6.1;rnxvvc 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 fxnc6v. t1cr ;valls 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 motionlessjeh9 ae/sp54 l6,xg .maeyry, a height ho above a hard floor and released. Assuminjlea .axep4 y 56gmrhs ,ye,/9g 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 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 t0u0: j64wu,l;;q4xkgqbp ok swpl,e qhe car takes 95 meters to come to rest, what is the magnitude of the minimum average net force necessary to stkp6jsubg0l0 4pwlqx ; ,;uoqwq:k,e4op?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it stokd1mj;xa ak; y:)/;r htl amj2ps. If the ball travels 15 t2mlx:r y 1;jja;kadm) a/ k;hmeters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two 3y fn+ru),dpbedt uoa;5pj )2vz mf1+laboratory carts of different masses but identical kinetic energies and the three following statements. Which of the above statementsd1r+fvdp ,3 5 yumna)tb2uep z ;o)jf+ 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 a8w .0c +ngj 2gdjxj)rfir with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches itw0jgn 2.dx )jj+fgc8 rs highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary ck.hrps5l u*q br bg,)9oncrete surface. The boy, of mass M, leavs59brglh )bu, .krq*p es 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 mas4bia ;6t b+zakx)hs8is M is 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. Assumz4xhia68t )bk; s+abiing that air resistance 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 aheighp(j3j 8 nlbn/xfisg5r 1t*gl(t H above the ground. The object boun (*/ fpgl3ng8j( 5njris l1txbces 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 mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is puknf(ie(qnm ) *xq0*yulled sideways until the cord makes a0enqy)*iqfuk( xn(* mn 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 unknown ay,.69gvu gd fs7szp.kngle. 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.gsd7v.p,y gz uksf96 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, along a 15b o8c;bnr.wa;z ;asqkp .b* p0-meter ramp to a load r za.ocb*k8b;ab; s5q;n.ppwing 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 dock?

  12.16: A constant force F=50N (asi 2pq v 6s.rn-q8aby-t y23wtf shown 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 f 23n i-fv .qys2p8aryt-bqw6t ollowing choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A mrw ,l,p,e.osyv ao(.and 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 dropped but before ball A strikes the grow,plyo a.,sro (.mev,und, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object ocg(roc.e y;w 9f mass M straight upward 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 he;g .cwr9(oeyc ight does the object of mass 0.5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a sprw x80+:weubs cj4,)gq2mcy qv ing that has a spring constant of 20 N/m. Thm wyc)q +x2:4vg, cqws j0eu8be potential energy stored in the spring is:

  97.10: A compressed spring has 16 J oflx oc8- -e.kje potential energy. What is the maximum speed it can impart to a 2.0-kg objectekjc-o8e x-.l ?

  

  10.31: An object of mass M starts from rest at the nel+v4qh. szpd7*+4j0mn fv wbottom 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. w04+sv lqj 4nvm*e7n+dhpzf same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.