97.01: A force F directed at an angle of θ above the horizontal,oigu 8w 8ly1b is used to pull a crate a distance D across a level floor. The work done by thegiw8uo1 by,8l force F is

  97.33: A softball player catches a ball of mass m, which is moving tor+x c7+i ;mbzbward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force ex;rm7b ci x++zberted on the ball by her hand is

  99.14: A construction laborer holds a 20 y2-c x -bza/wystdj2j7y -0 wrkilogram sheet of wallboard 3 meter above the floor ya /j-z-xcyr ys2 twb-j 7d20wfor 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block sld l pd0so +tm44gv,1tvides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy gt ods1t d,l0+4vmv4pstrictly 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 unl zj63;gxs7tx iform acceleration on a horizontal surface for 5.00 s. The block’s kinetic e;7 xl6 zx3tsjgnergy 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 kg blo(,dy x9 trlqqtf -/ q.2cjqfa3p/f)ezk 75k pmck for 5.0 s. The block was initially at rest and slides on a f/jzrqk9(q.7t 5eq3,d-k tc pf )m px2/lfqyahorizontal surface.
What is the speed of the block at the end of the 5.0 interval?

  16.12: A 12.0 N net force dirl+ yvtb/6wilary;ck 0b)6 gkpl4d3d9ected to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and 9rklipdt ybl66dy/)l0vwb+a 3; c4gkslides 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 frictij2v3fni(7ds nonless frozen pond throws a 1 kg hammer in one direction. After the throw, the hami2 jsv3(n n7fdmer 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 tqbbj1vzl - .ip5 zt;r9*n.vwihe air and gives it kinetic energy. An hour after the fan ha9-nvibtr 5z.l*vzjq ;. pbi1ws 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 pw+ fc/s-7xv )gxhypa5osition of 3.0 m, a speed oypg7vc aws+f ) xx/5-hf 4.0 m/s, and 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 :h0-s wsajbf5qb)j 6j m from the floor. If the janitor relocates the box to the shelf that is 2.6 m from the floor, how much work does he do on tfj5 sb j6)jw0sh-b: qahe box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (abou3 zk 6lgz8.9a 0kclhmwt 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about3896l cmwz.kg0 lkhaz 65 mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box mor76zz3 -.cx jqf met;xves 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.mq te;z j3f. zrx-c76x0 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, aq:22qb 8mb5l ycidquvyuws.bs-;: ,q box moves with speed 5.00 m/s at the bottom of a rough, fi.uc,l w;vq 85 bdqi :2- ybs:bqm2usqyxed 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 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 +4fc5taw-z yy 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 distance F, what is its speed in terms of B?a+zy y-fcw54 t

  12.07: What is the net force acting on tm(dek s(3mx+k he object during the time interval of the accekmedx (+(3ksmleration?

  12.08: Through what disjk egt-iz7.gt7mn0f8 jk ) nm* 0 kkbel9f1jz6tance does the object move during the time interval of the tk.zjjm) *gbe0z 8n7f7-gj nflkk0km 9i6et1 acceleration

  12.19: The magnitude of the linear momentunsjh +iz0gu:z *8x b-dh,hg- cm 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. Whau0 x-i*,bcs-hnz8h g jgzhd+:t is the change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0hr uwjx92 6m mp)k4:f6cxv hv/ J of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents t64km)jhvr: 69pv2xc u hm /fxwhe mass of the crate

  94.38: A force F at an angle l /+n:o2 qh s*c2 et02zqu9mvkp/ce 7jdn8yga 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 friction between the floor and the suitcase tjh 28*g7q2un d/ +z9n2ys0ckm qeaeco :l/pv is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force and deliver4 ubwqa;3t e0v a)xy1ps a useful power output of 0.10 w to raise a block vertically at a constant speed. At what cot ap a4byevxq)3w;0 1unstant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is relea(q g,e )-wl(rebvgalf60ae1 esed 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 o0vr6 w,)a ge(1bqelage lef(-n 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 object during the fall?

  96.18: A rubber ball is held motionless a height ho aboverof+ ji.3wc,dv)esku7ji 60dng.g6l 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 aboes0 7n ru.ji.3f)gwgojcikvld6+6,dve the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barrier ixhbw p.yj .miirp;3r*;.wvo 6/ezy(ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimurmo p;(.jhiir;/iyb *z6x3evwp w .. ym average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it stopsdmr* ;u dl:m+wsos*g -t g8r/w. If the ball travels 15 meters, what was the average net force appl-d+mu t rogr; g*s:d*smw8wl/ied while it was coming to a stop?

  02.26: Consider two laboratory carts of r7mdp - sj: yq9u35ctfdifferent masses but identical kinetic energies and the three following statements. W 9dp-r5yfc7qt:s3u m jhich 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 clay is tossed vertically icb/e1rgf;ay4i w / m7qa(fv d0( gh+gxn the air with an initial speed of 4.60 f4q/g(ae7ryai(;f h+ mg1 g/wc b0vdxm/s. Ignoring 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, lh3owhtda fk179,mn k8+s :rxstationary 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 poinmkk:x1h 38 h7 ,ds+oa9tf nlrwt 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 thel0oqc u82jnq2ll*xu 0 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, what is the magnitude of the average constant f2ulco2qul0lqn8j x* 0orce exerted by the ground on the object while coming to rest?

  12.48: An object of mass Mpbu z)rg(,ygm q,yp)/d2h9 cf is dropped from aheight H above the ground. The object bounces off of a horizontal surface in a collision lasting time T. The objectz ),p gyuhpd(qbrc)9/f,ym 2g 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 m5sc7oksa6 unfv44 i7pass mon a cord length L is pulled sideways until the cord makes an angleospc 7s 6vf4na7kiu54
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 ofy*xfq-d2im .h d:ps9 c 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. dcpd*s q ix:-9yf.m2h 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, alonuhggsx8xf0-s f ji4/9r)a zb7m1z)vcg a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a mass of 25 kg, what z/sm 7u bzsgh1f0 xi4)xacrv 8)-jf9g 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 apwfj4 pjnmg22db+xk6 d ;m uh2.plied 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 represe2dufpk mjnhmx2 j6w2 4dg+;.bnts the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped frxg7 t6tk*t*rocd.dcpy . y31mom 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 are the mechanical.oytd.67tk3ccr*t1dpy m x g* energies of the two balls changing?

  11.28: A person throws an object of mass M straight upward wiwrpud*, x ((brth 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 masp ur,b(wxd(r* s 0.5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spr/9 yi: .cbq3l 9egnt/8jmzhfn ing constant of 20 N/m. The potential energy stored in the spring iz8:/h gmjfe. lqnic/39yn9bts:

  97.10: A compressed spring has 16 J*bl : ryhay4/z of potential energy. What is the maximum speed it ly:ry h*ab4z/can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at -+amxatz 9 6isf 7w2outhe 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 between the incline and the object fo7fs+o w-mua6 t29xai zr both trials.