97.01: A force F directed at an ang3f4o ixa5kg*jle of θ above the horizontal is used to pull a crate a distance D across a level floor. T ofx *a354ijgkhe work done by the force F is

  97.33: A softball pla n )p 3*crvafxks9hk*/yer catches a ball of mass m, 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 horizontal force exerted onknp*9rxcvk f*/ ha 3s) the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet ow tq 7;,5h6p kidxfvm/f wallboard 3 meter above the floor for 4 seconds. During t 576dm wvthpqi/kf; ,xhese 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slid9zbc.h2y.dp +x7.3 u 4 xniv hyzujlr)es with uniform acceleration on a horizontal surface for 5.00 s. The block+24j 7cx9u.y)nv.yluzhrzh i.p3xdb’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 acceleration on a h9(ogl-uz6wr enc +/;wj yk: cyorizontal surface for 5.00 s. The block’s kinetic energy strictly dcyg /c(y6erl-k jnu ;9oww:+zecreases 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 exm*;du ;yczzy8c0 :gp verted on a 3.0 kg block for 5.0 s. The block was init*cp8y;dcv:zg ;0u mzy ially 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 fo-y tj6 ebu)4ct,ddg9 frce directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at reecj4 td6 ufygbdt-,)9st 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 pond throws a 1 kg has fbw bsq(19d6kd c0/hmmer in one direction. After the throw, the hammer moves off in one direction wkfbq0(d6wc h s91s/dbhile 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 kineticb3)rjz 6olm(paoy,q arh7 3x( energy. An hour after the fan37), b ox(l qzm ap6(o3hyrjra has been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of rr(nsgwhe, ( 4,l0i */a upefomass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and,(roli/spweh4 f*0en gua(,r 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 xo(w+x*ts8 2j :rqge bis on the middle shelf in the bookroom 1.3 m from the floor.xs*( ex+2qw:rg ob t8j 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 horsepower) of power4)haw jfri8, el3iav6 to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65 mph), what is the mia,3vlaj6f )4r8ewh iagnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box3p+qzt -5 iru3+ zt/qg d.cyry 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 = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reachesyd35z t.rug- z3+pcy qitr/+q 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 speauu .uiwr :b6/pt2n0m ed 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 forceuuwbm .a0t:p62ni /ur 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 travelvfo a5sdu5-lq 31r: h6,.kzxg qwbrq: to the right, 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 same distanc:la-1dqxgvbw553q zqufr, o :hrsk6 .e F, what is its speed in terms of B?

  12.07: What is the n+r4 uyz*w5d7j, r hcx:mqt*l let force acting on the object during the time interval of theyx* c 5r ,m4qw:d+lz j7hur*tl acceleration?

  12.08: Through what dist25.tl3 nwqbc p)g c;vbd,zz 9kance does the object move during the time interval of the acceler.5kg czw)9 ,2d3pl qztv;nbbcation

  12.19: The magnitude of the linear momentum of e28 p,ktya *z3;bqrq ba 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.mqba83qktr2 ;pz*, yeb/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 energy while its ou kyh3t6)i;eew k/i+8l,)tk- r s mzuspeed is increased from 2t;kw,-u)e slim8h tz+i k6uy ro3/ke) .00m/s to 4.00m/s. Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull a heavymdbg-aao:z) 6pb1q ,c suitcase of weight mga distance d along a level floor at constant velocity. The coefoa: 6, ma-zg)b1pqd bcficient 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 upward force and delivers a useful power out9o nzx,08 hkemput of 0.10 w to raise a block verticallm8z 0,e okx9hny at a constant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg objectg l4:nanfi1 v-+ xyj16a r7dnf is released 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 work on the object as it falls 1.00 mto the ground, which one of the following choi an+lid-f64jf1xnna :vg7r1yces 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 v y mn-rl )69 cl: owib-n*m)7,ojitq-sqz5h jis held motionless a height ho above a hard floor and released. Assuming that the collision with the floor is elastzqnj5hno mybjqli6-i,l c9*7t: ))ov-sm rw - ic, 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. 99k 8mjf: ytbc+syz47gwv s .pIf the car takes 95 meters to comet.:y cw4z9b gjsp y8vf7 mk9+s 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 i/ fut+ )0qqtxn0sce) mt stops. If the ball travels 15 meters, what was th0 cnq) q)st/fe0 xmu+te average net force applied while it was coming to a stop?

  02.26: Consider two laboratofdz1q6-z 1sm ory carts of different masses but identical kinetic energies and the three following statements. Which of the a zofs-z1m1d6q bove 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 .z(5hmueut ) u( nb+uzinitial speed of 4.60 m/s. Ignoring air resistance, what is the change5( (mthbu zzunu.+ue) in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest x.i:w:s:4zl d n,hanwstraight upward from a flat, 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 much physical work did the average normal force of contac:lanwd:x, zh4isn.:w t (N) between the boy’ s feet and the concrete do on the boy?

  02.48: An object of magu;xthau *3vqk h janv6sqh 8*.ql cd1ew5:/:ss M is dropped from aheightH above the ground. The object crashes into some soft earth and comes to rest by cov*uclh5 j:qw1 qu:etnda.v6/38 kahsqxg*; hmpressing the earth a distance of H/2. Assuming 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 froqfjvxl,yjcp (2ofy3x5/b 42r m aheight H above the ground. The object bou2rv c34 fp yjj o2fq,xx(ylb5/nces 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 a ,i3:.oicwpvL is pulled sideways until the cord maki pcio avw3:,.es 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 incb9guq4n0 wsg0j )r pjb 525vnwline 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 position a5b rpj wv 52w9)unn0j0b4 gqgst the bottom of the hill?

  06.09: A deliveryman moves 10 cartonmrw9tk0w a7ztmi /a,;r,vpj kb1l* y7;sp7 fns from the sidewalk, along a 10-meter ramp to a loadingj/wl n*r7 9 s7kv t; fw7, apm0arz1byt,imp;k 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 sho7 u1ib7wh0 pymrht2g2wn 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 following cho27g72 wurtiphhby0m1 ices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B pvgtl3hq2s )r/w5gm9are each dropped from rest from the top of a tall torqv5ts wlg/mg93 2p)h wer. 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 mass M straight upwarbh:q76x.tai , lrk38n mul 4kqd 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 0.5M ru a8: x6,mq7n3q4klbrki.th lise above the launch point? Ignore air resistance.

  96.20: A force of 10ngi4 ;(ttz;jiwu(d7 k pg+)lt N stretches a spring that has a spring constant of 20 N/m. The potential energy stored in the spring ( j;(ztgnupw itl7dt )4igk+; is:

  97.10: A compressed spriq8 krt zs(:/9y 3nkujnb *e:hbng has 16 J of potential energy. What is the maximum speed k(bun eq3: tn:kh9*bz s/yj r8it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at thebi w-ok4)ooy05jn1(hoa bp)vvd7 / xe bottom of a fixed incline of height H. A person decides to push the object up th))yh1ibp kb 7jo (5o4ew v-oxn0/avdoe 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 incline and the object for both trials.