97.01: A force F directed at an angle of θ abovi ,o,5t xrbs-we the horizontal is used to pull a crate a distance D across ax ,w 5,-obstri level floor. The work done by the force F is

  97.33: A softball player catches aj,tnkzv,3uf hajle h7v41q 8: ball of mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moven tz :hk,,q 3fh7uvlj4ej18av s back a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction mxiff* e-lvj0ok4x e vh9(p ;0laborer holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 sx(hfpm vvexje 4*0f0l-o9k ;iecondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform accele:,i syb7 fdtdwpus *;(ration on a horizontal surfa*,ddb; u7stw( yp: sifce for 5.00 s. The block’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 horizoneq. /:hc:gylksm (xz.3 lta +etal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J iae+lxey/hz: 3k. .tq sm(: gcln 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 t8idpolfk )x9et2x / 9rhe right is exerted on a 3.0 kg block for 5.0 s. The bl29 pdofr/ t 9lxixk)e8ock 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 exerted on a 3.0 kgnu02y- t.x trs i sj9ege,amk(c56-nsa; 1ice block for 5.0 s.ei,j(gxees r1na09;6tit.mk n5ass2 c -u -cy The block was initially 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 restj lj/x 0jes.*gon 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 dejlj *.jg /x0esscribes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour ar -4hayp/l*v*3gpo ol fter the fan has been tur3l-oygaop pv*l/hr 4* ned 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, ap3copr2 pjg x8 etikg(41/cv. speed of 4.0 m/s, and an accelerati/c81tg o3gpxc2(rp kv iej.p4on 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 ;s t)feqdhu;x of7k 9)bookroom 1.3 m from the floor. If the janitor relocates the box to the o ; xtk;9 7hfd)fsque)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 enk+ )x vz/fgpt e5gy.qpv lcfg;fz )cu0/bp- :2gine delivers 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the :;ff)+up0bvvlc) gpkcpx. 5e2q -/g/fztyz gcar 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 )qsbpmwvdd ,0 ufc i-6n.-7ivright, a box moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. Thqd,vs)pmuwf- v i n70db .c6-ie 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, a4bqfnr g i,oi6n3c*, r 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 qro46fn3r *n,,bigic 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 e4azl7byqm,b m3 )(e xrest, 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 ,l3q7xm eb zbayme()4distance F, what is its speed in terms of B?

  12.07: What is the net force acting on the objecpby pg .r u5ev-/z5oo2 b,z-gct during the time interval of the acceg 2zr -b.uovog5pc /5 ,bpy-ezleration?

  12.08: Through what distance does the object move during the time intzclbi5uo 1 +)kerval of the accbk)lz1c5+ui o eleration

  12.19: The magnitude of the linear momentum of apm r *u) iwnuv2;8qg)whd-(dd 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 energy of the mass durin;d 2qgi)*up hdvruw- (nd8w)mg this time interval?

  14.11: A crate gains 36.0 J of kinetic ener3oe g* o9c n9a8emg5k4b3tuoggy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of the cratb8eon g9ogactgm35ek9 u4o3 *e

  94.38: A force F at an anglv)r.6lblf ils(t :9uie θ above the horizontal is used to pull a heavy suitcase of weight mga disv(il6 fb:)usrll9t. i tance 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 is:

  14.31: A toy crane exerts an upward force and deliv vvc dmig. p;v-5)*nzt-fexj , zl--ngers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant spe dgn me)fp-c zt,-nv;-zgv*vix .l5-jed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released fn2nq4ggmy *hl8lc* u 0d +k8gsrom 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 choices best represents the amount of work done by the gravitationa+gygm* lshg8280*nu k c4dnl ql force acting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless vstuk;p /a9t fxkj62 u/p,5yaa 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 fu/6tp5j /k;s2 yaxtkapuv9, 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. If th8ezrw m((simex /- kok9l4x/q e car takes 95 meters to come to rest, what is the magnitude of the minimum average net force neckmrl-/(z4q wix/kox (e8s e9messary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows dowh1 ;):rkbll0o.z+ rqh 3jduqd;r r jg0n uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was coming to.rlz10 d ;rl03) +jh:uq rgd;bk jqohr a stop?

  02.26: Consider two laboratory carts of different masses but identical n bwl.hz+x39e kinetic energies and the three following statements. Which of twlhb.n9z3+ xehe 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 veijt u3p,ki:0k rtically in the air with an initial speed u,i tj:kk03ip of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps fromw s nbml:wjq(y)45/ fx rest straight 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 contact (N) between the boy’ s feet and mqfbwj ( yx4nls w:/)5the concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH above the ftqp .:zzj*)we z4n x3ground. 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 force exerted by tqtz )xp*w.:zf jz n4e3he ground on the object while coming to rest?

  12.48: An object of mass M is dropped from aheight H a5u n yy)dsdw(7bove 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 was the magnitude of thdwy75) n( dysue average net force acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sideway6f 4gyjzl ajr4+pf895nsmhw ,s until the cord makes an agj zmf96ys l4,j4nh8 a+5 wpfrngle
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 inctmjun8 03nx xtce86e2line 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 position3cn80jt xmexte8 u 62n 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 fromtv4t6j2 0sm-i*dqfic f )eh5t the sidewalk, along 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 is the total work done by the deliveryman on the cartons to mo6 4difqjt2et*hsvt - )05ifcmve them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) ismuufy,x gpp-. qgs. +: 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 work do+:s, x.mpuy.fg uq- pgne by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped ax k:1xm m 0b5-liq -dswk00zlfrom rest from the top of a tall 1wdk lml05xz i-x0kbmq0:sa - 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 of the two balls changing?

  11.28: A person throws an object of mass M straight upwa.gn ox:.d(stky:al yz .t,tyg-7e*dm rd with an initial non-zero speed v. The object rises to a maximum height H abottgy:n 7xyz (d,kya .emg:.*ots.ld-ve 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 constant ng07qstd(pr(e l 4rua,b)ph0 of 20 N/m. The pou4 bsg0 (pad7qerht ,)(rlp 0ntential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potentgw 0pjxt8zg ut5(ssj ,;*6vdiial energy. What is the maximum spe ,sgg6pt *(i8 jwj0ztx5 v;dsued 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 inc:tbbzmmkelb / ,lesc1m z60tb32dk56line 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 for both t e06mb5k :zmbctlm3 k26bde1 ,lz/ tbsrials.