97.01: A force F directed at angj2.ozcc q .aewh;fudtm54 ,2 angle of θ above the horizontal is used to pull a crate a distance D across a level floor. The work done by the force F i,o guzw22c;5e dtc.a h.4qfj ms

  97.33: A softball player catches a ball of massa*ro 4f+ s;nbf m, which is moving toward her with horizontal speed+;bafo rs*nf4 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 wf)n,gked( :en1onb 6qwwule6lb 6b+4allboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was ef:n41+e b bekq en bdgnl66wul,ow6 ()xpended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a hori6hwwo*/yq)hq iy efe bv5p/ )1zontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50 /e1i6*ypwyhq/v)fo 5hweq)b .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 bl ,zyl+p3s 1c2asz i8rrock slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly rlsy iazs8,rz2 pc +31decreases 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 3.0due(2jzl- w3 h8cjo5v kg block for 5.0 s.2 ow3c- deuzl5v8j (jh 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 directeny -avbad1o(b 8sqr: 4d to the right is exerted on a 3.0 kg block for 5.0 s. The block was inid qby-(so41bra:v a8 ntially 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 rest cl(2n,/yxh 0ijie jez k3o8g5on a frictionless frozen pond throws a 1 kg hammer 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 g,ijee 8/0x3ni h 5(jlczyok2 describes the above situation?

  03.14: A fan blows the air and gives it kinetic enersw;6a 95ffkszgj 9 h 966zbezzgy. An hour after the fan has been turned ozf6a5 hzj9sfz ;gk z669swe b9ff,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.505dihly.aeu zp8*4p 3f6 y gd7t kg has a position of 3.0 m, a speed of 4.0 m/s, and an acceler eadpg d6*y5 yh.tzif4ul873 pation of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textf ddf8;r))+mi d/z7aza scf .lbooks is on the middle shelf in the bookroom 1.3 m from the flo)/)dafm+7d ; dlcr8f.z izasfor. 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 enrkjj35.)g lo t3 d /csgup;fg(gine delivers 24,000 watts (about 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 the magnitude of the retarding force acting on the33so)gtpug5 . ljd(g jckr;f/ car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s at the botkb o, a38zujtydt3tlv6hgj3z)08 j+itom vdyu3hj0 jtg3k bt8l3z+8a)oj,z6i tof 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 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 se/a 5zyzi(fgw7 5 sfj -4eiw5ypeed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of thei5( es5f/y4ji w-w eazgz7fy5 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 starting from rest, along a stravzq6ce *3fqk 0ight road. CarA has twice the acceleration of Car B. After traveling a dist0fq6qke3c *vz ance 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 on the object during t15l q(hlyqao.s*pb ne /m3-j she time interval of the acceleration?/.shlaq1m nyosel3b*p 5- j (q

  12.08: Through what distance does the object move duringyz6+ mr po-zdsi 4s02deftkcn30 *(ji the time interval of ths4yt 6-es icm2(ok 0j3z+ndz0 idrp*fe acceleration

  12.19: The magnitude of the linear momez1 h:lp +:;j6hp;tdrhuyo- mkntum 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 en o-jhhpd: r:+pt1uz6yl; mh;k ergy of the mass during this time interval?

  14.11: A crate gains 36.0 J c/h: *mhp uirp8) ttv.of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best rep8* rp mvhih/. )ttcup:resents the mass of the crate

  94.38: A force F at an angle θ above the horiz23a 7 4wutnaxoontal is used to pull a heavy suitcase of weight 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 th23a noa 7w4txue frictional force is:

  14.31: A toy crane exerts an ue*e saleu18q u 4b2+oym4by s6pward 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 *u eesebb uao64s+14yyqm 2l8this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surft4+b,d8wxuvq ace 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 amount of work done by the gravitational force acting on the Earth by the 1.00 kg obj 4xwvtqdu,+b8 ect during the fall?

  96.18: A rubber ball is held motionless a heig+ ky8dc vwhn/rr:- cf7ht ho above a hard floor and released. Assuming that thk n+yfr/dc:w v ch78r-e 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 ahet08n cmvc(5zrznkk76net0h 6 ad. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net forcecvzcnrh nte8 mt 05nkkz7(06 6 necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down u xhqnl6:hq,*xtg k/)tniformly until it stops. If the ball travels 15 meters, what was the average net force xhng/tt:kq)q6hx,l* applied while it was coming to a stop?

  02.26: Consider two laboratory carts ofse/cua 7 qbi2( different masses but identical kinetic energies and c7e/2su(biq athe three 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 cl -,/ee ybmttnxo- 0gzy 3hw26jay is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring /wzn-3m 2 gye6h-xbotej0y,t 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, statio-u5qyb hhp- n2nary 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 they-q u5b2hp-nh 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 ai,)vtl- e2ty y5)j.g 9tsizwjheightH 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 negligible, l.i-9jye,vwts tg yzi)2)5jt 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 obj6li x+fnuiv0 0qns0h* ect bounces off of a horizontal surface in a collision lasting ti 0uihi +n vf6qs0l*nx0me 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 cor,2u af/p(ew3 i1u d d/t.l pxa,erydd(d length L is pulled sideways until the cord u/,( pr edxfy23diaawudd (. t1lp,e/ makes 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 incline of unknown angle. The sled, w*d8g.n*g ihna hich started at the bottom of the incline moving at 10.0 iga.nd*ng h*8m/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, along a 10-meter ram 9;d)xh2qjzmlp to a loading dock, which )mlzd2hq;xj9 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 figyv/( 0pb c:bfhiv3l5ww:f sa/ure) is applied for the 6.0 meter motion of the box upward along the inclinel(3b wyf0 :wbh:/v5/av fpic s. The mass of the block is M=15 kg. Which one of the following choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B a bj f0wo,p q.nhux17v1re 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 ground, how ahuvwo1 xp, n70b qjf1.re the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight qmefg8o7c wp 6 23v5c6 jcwzh,0zbfo-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 heigh7cqzhwb pzcv63oc0 -68f5g2o wmj fe ,t 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 spring constant of .ec 38 ykxnbe)20 N/m. The potential energy stored in the spring i.xn8 ee3yc kb)s:

  97.10: A compressed spring has 16 J of potential energy. What is the maximuot-gr5a,0qvcoa jm1g) *u xa/m speedq 0 5g)aajo-v 1tcro*amx /,ug it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incline ox)-zrh 6mjvp r 3sy7,/y; uemxf height H. A person decides to pysxz) ;73ruvrx m-pjm hey ,6/ush 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 between the incline and the object for both trials.