97.01: A force F directed at an 04pekp kkzpo4 9g.8d)f-htscangle of θ above the horizontal is used to pull a crate a distance D across a level floor. Tht0) pgc4f -op.8kekkzh4psd9e work done by the force F is

  97.33: A softball player-py1-gck m0tp catches a ball of mass m, which is moving toward her with horizontal speed v. While bringing the b1ytc pm-gk0p-all 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 wallboard 3 me2wjs/l, wqxp5 ter above the floor for 4 seconds. During thqswj52pxwl / ,ese 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with ,g/m 1rpvej+*mix(u0 uh g. oi uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic enhixu(e +m* ,u1mr /.jv pgi0ogergy 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 su:ip u ,85ajke8l9p velides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 5p8pjiu lka: u9,v8ee 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 bn5rr *mdbaws4-j8 gv;lock for 5.0 s. The bgm4 - nw*a 58rdjrsv;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 direct0 5vli+ymc8lc ed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on icyv+l m0l58ca 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 /m,l(pvk-fpl mak: ;b hammer in one direction. After the throw, the hammer moves off in one direction while the student moves off in the ot-l fp;k l(,bp:ka/mv mher direction. Which of the following correctly describes the above situation?

  03.14: A fan blows thprrqm n:4t.5f e air and gives it kinetic energy. An hour after the fan has been turned off4.qnptmrf : r5,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block o2-peepulpt39mal l4 b o:l64 jf mass 0.50 kg has a position of 3.0 m, a speed of 9 tp a3p4bol46j :lmelepl2-u 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 m frohke0gh4q;sq)8hy h f qi n/7va0l:x9mm 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 the box. The 87q sgyhi/ mx h qev0;hn4f)kq90h:labox has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepoweylz* hs*q( tz 6c+k*tbr) of power t zql(bk*t c+sz *y6h*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 the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s t:7dgwoywsdj jr fjm (58/-dii/6,l o 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/sgt/i, :modos 5dwf8wyd j/-l6( ji7jrwhen 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 speed 5.00 m/s atyc5r,)zjwho jj . om1+ 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 of F = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the top o. 5jcrm1jo + ,zow)yjhf 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, alonv5fqsd+1e cwfd n0+1j g 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 distance F, what iss511fqcnejdf+w d 0 +v its speed in terms of B?

  12.07: What is the net force acting on the object during the time interval of ;ea+(l u;(zo h u 0utj-jcs3ritcs((+-l3th ai uzu j;0; oejruhe acceleration?

  12.08: Through what distance does the object move during gr 1hymw3aw 4 gzq)d x:8jr,s+the time interval of the acceler, s zgr gqy1hm4 x:j3rd)8wa+wation

  12.19: The magnitude of the linear moment3dofqr7mjk 2aqx//f pb on;2/um of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6qok /mj2 b/r/3qfo;n7fpad2x .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 speekx/ a. oei;+:z )wzfugd is increased from 2.00m/s to 4.00m/s. Which one of the following choices wxz:g). kaufiz;+ eo/ best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull a f -o/ e9l3enl+9op ts,qnk/ vzheavy 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 the frictional force i,-lve ek9n lsoq/fo3/ z9 tn+ps:

  14.31: A toy crane exerts an upward force and delivjx-xnmjq6o8z i.hm q-) flqb-(4wf)xers a useful power output of 0.10 w to raise a block v -f)bhxx4-xlzj(n.i6 8qmj-)q fwmo q ertically at a constant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released frolm;23n gc34 -k ie0:mppd ejfam 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 ajc3k;d -3im:pl n2femp g a0e4s 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 motionless7 4n-lxpp8izc-x yprs t+um-7 a height ho 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 a-spcx7+ u4-mn7tl 8zpyrx-ip nd its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barrier ahee y -x l9tqy1m;6lu uw;uji--vad. If the car takes 95 meters to com;u yxytmi j l-1;eu-69-vqulwe to rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 1j hs j+s4jl8y:5 m/s slows down uniformly until it stops. If the ball travels 15 meters, whljh y4:ss+j 8jat was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but ident;qfo5y) vbym,eye03 u6i 9wqtical kinetic energies and the three followinoqqt;3 mibu)e, yw 05vyy9 ef6g 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 clay is tossed vert3b.if k0g7uji3gz/-2lpum j w cm *a:oically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its/ku. pb3if73lgwu* mj0 c-mzia 2goj: highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary concrethl ljbn,v;qa)s 1goi0 :5aa f-e 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 averaahjl q5, ) vfos0a-:gaib;1nl ge 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 the g 6a56xsmlz d/e+tkl9q(p4 zeo round. The object crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Assuming that ai /k9l6po x4qe(mlazd5+ze 6tsr 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 aheigh u5ct1-n f vlv:ia3s6vt H above the ground. The object bounces off of a horizontal surface in a collision lasting time T. The object then rises upward to a maximum height H/2. What wvn lcia1f- :5v 6svut3as the magnitude of the average net force acting on the mass during the collision with the surface?

  96.38: A pendulum bob 3i fym): x(le1dwyz gki1v7 9bmass mon a cord length L is pulled sideways until the cord makefv3 k1 7wyb9)zx(ldm: ige y1is 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 incliw)45 s4 (qgtbwcji)gapcl +/fne of unknown angle. The sled, which started at the bottom of the inclin)cwg4/swjc+qa (i4)fb5gt lp e 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 at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 10-meeg 6pd4 n)..mf.yv paater ramp to a loading 4y..d6)pg .mfavnepa 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 forcef(o7 bi )mo0er li/k0:bvb9r s F=50N (as shown in the figure) is applied for the 6.0 meter motion of the be :0m o7fi r(bobkb9/i)srv 0lox upward along the incline. 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 are :+i3q l )ejg)u6v5xia6nhxf + ,:trth tzbkv4each 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 are the mechanical energies oftu,gq eiilt x)n 4 fhab56jk rh:)v+z vt:x+63 the two balls changing?

  11.28: A person throws an object of mass M straight upwapuex 9d *f- zz6dy*4 dika;is. sux2v*rd with an initial non-zezdi 4d*d6visx a* skpe; yf*2x9.uz- uro 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 rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring constap,jy4dnt9g,bod6 56fzm lc r*nt of 20 N/m. The potential energy stored in the spr9 m jb*65nzgd d ,pftl64co,yring is:

  97.10: A compressed spring has 16 J of potential energy. What n4bdw14.tw1o kyj bhy 27lrl(r() flhis the maximum speed it can impafhh 4(j)wy(4l2bbnlrotk1 d1y rl7w .rt to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the botto 1i;vyaky v3lvp kuhdo(2 b*3;m 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 o lk p;h; 2ika(vv331dvby*uy 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.