97.01: A force F directed at a (yva j5e x:9nw/h/suzn angle of θ above the horizontal is used to pull a crate a distance D across a lew z/:sna 9e(u/yxvh5jvel floor. The work done by the force F is

  97.33: A softball player catches a ball o 5n,x-ciax kk3f2z h:jf mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a dista23axi c:j-kzxhk 5,fnnced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborh4z0fd2ftx 1cuj zd*9er holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondsho*u z0z fjdc12xfh49 dtw much power was expended on the wallboard?

  17.11: A 5.00 kg block+9ipw0vf v qbs7o5+5uok d- jfhr6 absy az64. slides with uniform acceleration on a horizontal surface for 5.00 s. The bf +7b+ ai s55uzj 6-p.savr4o9ohf0wd6vqkyblock’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 s+yw 6+-ofc ;fn*fp b.2cyzndvv,5v rmlides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kineticnr cf2z-5;np+6+wvfo.v *c dymf,vyb 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 exerted on a 3.0 kfyqo ga;itnrs/,*)6bzlagcz( ::*c l g block for 5.0 s.zl:nla6 ;*gtq royicg:a*)f,cbz/ ( s 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 directed to the right is exer,x*w* jphzz:6 +ijderted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on :h +,dpezjxj6w ri z**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 frictigqi jxa 3i57q2onless frozen pond throws a 1 kg hamax357qgj i 2iqmer in one direction. After the throw, the 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 , +k4 cnxq, ,a5tkhaolenergy. An hour after the fan hxkc,a 4ao+ t 5,qlnk,has 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 a position of 3.0 m, ag9nt5q,j s7j*a yei 8c0* m5x7nz ksfx speed of 4.0 m/s, atx fjg nsek c*m9*,zqna787syj 5xi05 nd 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 sh rwzi8:vm h.5yelf in the bookroom 1.3 m from the floor. If the janitor relocates the box to the shelf that is 2.6 m from the floom i8y r5v:w.hzr, 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 (abou7ng5llg9.vy;*xh r: yq:kbknt 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65 mph), what is then.h vbl59k :nykgg ;l7x:*rq y 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 atvwg e5 3w7dsj2 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 directlg j2 7vw3d5eswy 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, ar:b g26 tqw wyarf13 8j4epls. 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 constanwq1r4 f. 6 t:b2wl3 p8grysjaet 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 starting from rest, along a strai.+3l (;vlf5w q0qns3nzhhsaa0( nvv eght road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A 5qfnwsvv3 0vhq;ns (h0z l3l+.aae( nhas 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 durinel9o e6f e:+jfg the time interval of the acceleration? l:e+9f6fj oee

  12.08: Through what distance does the object move during the time interval of t hvumeo h30a/s/cz.o9 he acceleratvu /0/mhc3zse.ao9 hoion

  12.19: The magnitude of the linear momentum of a 4.00 kg poinx:c 9y+m,g0 rw,yml f+anq i2lt mass is changed from 6.00kg.m/s to 14.0yril:mcx+ +glw y9m0 ,n2 fa,qkg.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 J of kinetic eau a*ym -2aiw1+hd o*znergy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represen wai2 o1mz**daau y-+hts the mass of the crate

  94.38: A force F at ana9amld (w,uo3w a:5ea angle 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 frict,m9aa uea(3 d:aolw5wion 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 delivers - : nl+ebrb2:wwblij2a 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 0.22:b 2 enir:b+jlbw w-l0 kg block?

  12.18: A 1.00 kg object is released from rest near the sur8, ,8ip-v4jo vkeydtlface 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 tv8, kdy o84 ejlp,v-ithe 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 hoerba884dyb ;o82 - aamj,dh)hj ngfp * above a hard floor 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 and its height h above the surfa;2hojrg dha,e4-8m* aad jp8f bn yb)8ce?

  07.06: A 500-kg car is moving at 28 m/s. The driver g:;3(q lsa b,l)b9e,vy :dw ob-qy2ft al8zxjsees a barrier ahead. If the car takes 95 meters t ;b9yb oqev, :lf2( jt a:dq)sba-8y3l,gzxlwo 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 it stoo:m0ox m0/zco,ty6ex ps. If the ball travels/xm6y :0oo zec mox0,t 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical knty1g8mak: bwc iqb6xu-54 u/ inetic energies and the three following statements. Which of the above statemebugnwi1u a6y 5:4xm8kq-tbc / nts 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 /g*ulj945fpb nwaqz 0 with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change p5bau4gqw ln09/* jz fin its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flajpd6mqfo.i.4*m,c1za qo) 51m t i oact, stationary 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 cd)z i 5oap4oca, 1.tm6qimo1jf *.mq 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 t-ntg 0uc 1/ir0c/kh 0cadkfe0 he ground. The object crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Assuming t kg-/hn0e0c/0kfdrc ta0ui 1chat 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 aheight H above the ground. The objecofq;)qjij g 25h-4rxhhq1 -dkt bounces off of a horizontal surface in a h-h kf -x) 51djgjh;q4oq2riq 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 ism2f(wtk- 9ycl:c ,vw g pulled sideways until the cord makes an acwlmv2w y 9ct(fk:g, -ngle
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 angle. The sled, :18fb 8cfoniowhich started at the bottom of the incline moving at 10.0 m/s, r ifbn8f o:oc18ises 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, along a 10-meter ramp tw+y +;hqg dy6fsjbd:2ecq* d; o a load*gs+b + cq:yedh6 ;y fdq2;jwding 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 (as shown in i,8e,ucyoat7.m, i2o u:tr c3pww4o ethe 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 following choices best represents the wotye e3 utowc ,c,iau:oorp28 .m47i,w rk done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dr;h2tpau :b o2zz90g jbopped from rest from the top of a tall tower. Ball A is dropped one second before ball B. After ball B is dropped but obz2g;t9auj hbz p:2 0before 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 straight upward with an initial non-zm0zg6um-*2 k0 chj 3agrr: djhero 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 6c-hmgmh 0z3udg02*j r a:jrkof 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 spring that has a springb. iei9 x( t27wkbk:o8qlp 9xb constant of 20 N/m. The po.9qw:pi7x2( b8xtk9b koeibltential energy stored in the spring is:

  97.10: A compressed spring has kf tqm r*kc;jq2 /v9e(16 J of potential energy. What is the maximum speed it can impartm2rec q kk*v ;qj9/(ft to a 2.0-kg object ?

  

  10.31: An object of rwce( b -f qs pxi3we;m-v7x23mass 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 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 be-7f ipqvw(3em-3 c;xb wexrs2 tween the incline and the object for both trials.