97.01: A force F directed at an angle of θ above w, 9irr9o3dbhro, /w xthe horizontal is used to pull9x9b,wd/3rrr oiw h o, a crate a distance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is moving toward hexk7i :e 0u/z kmueu*4ir with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming u74z*eie/mukx iu 0: kconstant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilof e3p4 9rnm kg4axm)3ngram sheet of wallboard 3 meter above the floor for 4 e 43pf)n 39rnm4akmg xseconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block sl3e jrxpb4l6 ,+k.phis ides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy4p6+pl h. ks3be rj,ix 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 m/ ;z34hghspxwith uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetix;zhs hm34pg/c energy 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 directe1pjgo,q cip0u-8y;b o d to the right is exerted on a 3.0 kg block for 5.0 s. The block was init1g-p op,uc yb 0qij;8oially 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 x+0 sy,2cc8lrp t+yskm9c(ltwrm7+y.0 kg block for 5.0 s. 0slms2rc( w 7tt+9cl + +ypykry8c,mxThe 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 reston a frictionless frozen pkh(du 23q2y tpond 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. 2hdk3y2qt up(Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinr q ,0e7 h;7dvso9ec kt*k8g04csds h9sd+xp yetic energy. An hour after the fan has been tuergs0xs ,d9t 78 dsksoc4vc0*+h9k7e d phq;yrned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a blo -ed5us:r6er;uz n+bfi9; imgck of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an acceleramned;6b s:i9ei urruf+ 5g;z-tion 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 from 4m+);+hh e)x3dp e(zov5fdz dd)gngk the floor. If the janitor relocates the box to the shelee)+o f4 kdd(x gz ) p53d+)ndhm;ghvzf 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 ens:ww o)wx26 yi- jyv)ygine delivers 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 o)jyyyswv 2 wx) w6-:im/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/s66e:9q1mq/ zqyybir p at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the incline as it ism6 i qrey6y1b9 /qpqz: 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 speed 5.00 :vmn a4y+i18ovh8 tnayvwq3 5m1 (ncfm/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 of F = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the top51am:yi v moac8 4ny v n81q(+fvtn3wh 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 f ya1dj7 bb2ocxeu3x-z /(i-idrom 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 distance F, what is its bdu 7a i2(- ei13j zxobxcd/y-speed in terms of B?

  12.07: What is the net z-fiz i (kuyafu2 o+8xg5ust--hf4;t force acting on the object during the time interval of the accelettziuhf+ zxu-ak2oi gs-ufy5;48- f (ration?

  12.08: Through what distance does the object move during the time intej9hpbfk 3i: azc:0 5kbrval of the acceleratioa f0chjp3bzk:b5k9 :i n

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is changed fk9fr/1 k/ no*,hnjqmtro9trfh,mk /n1qj/ nk*om 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 during this time interval?

  14.11: A crate gains 36.0 J ba a.f:j)t+r+g7s lem of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which e.:g +f)sbrlt aja+m 7one 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 c,*a;h. ltick 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 thetcla,;*.ich k frictional force is:

  14.31: A toy crane exerts an upward force and delivers a use4rs4jwlk jm7pgv;5wnv*) c )lful power output of 0.10 w to raise a block vertically at a constant speed. At what constajv gprjsw*vlcw4 5m)7 l4;nk)nt speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of the Eart2,bk9ke pe 4 .r62j ocvcwg 0jdf9ui:mh, 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 choicjeckw k:bgduj0ife.4v69c opm,2 29 res 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,yx h2kic 3ges+v u,m49knz :;bzyh0h ho above a hard floor and released. Assuming that the collis ;h:2sk ynhhmi,y ,3zxcu+9b40evkgzion 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 ah0)yu*sc xgpb0a8j 0mg ead. If the car takes 95 meters to come to rest, ) a8 *guybgspxj00 m0cwhat is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/sf)f8wv 9yy mm2 k3vja,nas(:y prh 4d4 slows down uniformly until it stops. If the(94knvapyvf )j:am 4 y2,ys f3w rhd8m ball travels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratora3utyaa :rnkqv,6g t-.. 6pe ay carts of different masses but identical kinetic energies and the three following statements. Which of the above statements wouldqt- at .grn ak6u6 p:veya.,a3 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 tossednkq6 62fa7lpu vertically in the air with an initial speed of 4.60 m/s. Ignoring air a2ku67lnpq 6 fresistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upwar 6wkhe h,i* nznt:y 0v(qi29fid from a flat, stationary concrete surface. The boy, of mass M, leaves the concrete surface w 9zkhf*etih0 i, 2y( q6innv: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 the concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH above the ground. The objqm 4cw/jcd9z, 3;hld yect crashes into some soft earth and comes to rest by compressing the earth a distance o;l3w ,dyqc/9zhcd 4mj f 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 from aheight H above the ground. The ogzh )r5o7zh(cbject bounceo(zhr7c5h zg )s 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 L is purt1xb :b4c-.f8o u45;qf.h;o yayi; yinq ebt lled sideways until the cord makes anf oha-u;.qt;5qibr 8fo.1 ybxti ynby44e:; c 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 slewj0 l )odryai10d q3)zd, which started at the bottom of the incline moving at 10.0 m/s, rises dyda)0q)03 riz l1jowto 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 fr1frew v l)3s/qom 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 del /1e 3rqfv)slwiveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) i:p)u pw3kyu b4s 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 cho u4)bk3pyw:up ices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A an5n ,v7mv/4dvjbi76y0jn4y m xe etmr2d B are each dropped from rest from the top of a tall tower. Ball A is dropped one second before ball B. After ball4 mjv n5vnvyb4 e70/6jrdi7mey m,t2x 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 objepd*6 yxzd179h+gnjqr z9 prt m 3i4n2mct of mass M straight 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 height does the object of mass 0.5M rise above99n zh+3qdmrn4p g j2ztx61*7pdiyr m the launch point? Ignore air resistance.

  96.20: A force of 10 N stretchejttlwlv rba89,1cn n,+rz;o :er6cq;s a spring that has a spring constant of 20 N/m. The pot9rovr t:rea;cb 8n nt,ll c6jq1z;+w ,ential energy stored in the spring is:

  97.10: A compressed spring has 16 J of poten*ttbfi9u 03e4ke kl2w g9 pn0btial energy. What is the maximum speed it can ii 4u3tkfelt0 eg0wkbnpb 2 *99mpart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of amqt5+n vnuqc x6cq:/o 8d xa4) 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/xcqo a ndmu:5c 6 qqnx84vt+) 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.