97.01: A force F directed at an angle of θ above the horizontal is used td-vcy.) +id qjo pull a crate a distance D across a level flo-j y+)vcid.d qor. The work done by the force F is

  97.33: A softball player catches a ball of mass ms;nx0 f)e2,lihz3 ddu1vde g8, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constd2)i83d , snx1zvfe;uh dlge0ant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 38;hc-rm 3atiw meter above the floor for 4 seconds. During these 4 sh;-tar mwi38 cecondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acca 6) t2faixr4,myro4beleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.rtxa6b2oa,m)f 4 iry40 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 bli gzw.*ni0tbn6l u7o6ock slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic ener tg6wz *iulo n.706ibngy 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*t7m gmj7jshufkf;:zv - -i;l 3.0 kg block for 5.0 s. The f:g-j s jkv m7tfuli*7;z-mh;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 directed nrh3400gdfukq18nir to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surfah dqf31 ki0n4rnu8 0grce.
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 h xsj ,5-jdu8ji7my 9imammer in one direction. After the throw, the hammer x-,75d8jum9is ijmj y 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 the air and gives it kinetic ener0 :jnukth)nw*j v5n b9gy. An hour after the fan ha50 )vubhjnkwn9 :j*tns been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block o);xr7ppv8 f54 omf qgr,*tapof mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an acceleraf vppx4, o ;rgt7 f)op8q*ra5mtion 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 from3.t24 xb 2nbdif(yk.zrbsah8 the floor. If the janitor relocates the box to the shelf that is 2.6 mbb2z ft 2 r 43xi.(nsyb.a8khd 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 engine d1n c hm:cy)wf:n,9hpd3dm+um elivers 24,000 watts (about 32 horsepower) of power to a car's driving whee,hc: 9 mhd)3pn w:ndyfm+1 mucls. 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 mo1xzi 9ti/tb1 oves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration ti19t/zio1xb t o 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, aguq6k f(f:+cm box moves with speed 5.00 m/s at the bottom okfg uq6:(cf m+f 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 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 h )m4j/w5f zoda straight road. CarA has twice the acceleration of Cz of/45jdh)mwar 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?

  12.07: What is the neqz i+;)pvmbtfb f x nk19sw.7:t force acting on the object during the time interval of the accelerati 1t k zs.7;qbvpxf9+b:fw nm)ion?

  12.08: Through what distance does thepw 4x4ml mgr57 object move during the time interval of the acce4pxmlw45m7 r gleration

  12.19: The magnitude of the linear 7jeab(v);k7e+qe4 snc m/ sbfmomentum 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 kijm 4;7cveqn/b+a(kfs s 7eb)e netic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is iw*d.6y5czoft eti4 5b ncreased from 2.00m/s to 4.00m/s. Which one of the following choices best repwyc 54i 5tedbotfz*.6resents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is u v*r p2p6yeb:ased 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 suitcpp2yr aebv*:6 ase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force a -bj w)zpftiv,588*f:iiuhg e nd delivers a useful power output of 0.1 8j-)tf8b,i*5 p iwve f:zguih0 w to raise a block vertically 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 from rest near the yrkny4t 56 se: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 gravitational force acting on the Earth by the 1.00 kg object during the :try4kynes5 6fall?

  96.18: A rubber ball is held motionless a height ho above a ha 75 oecwe t2ku a bn)pi+1z;rkq0.tsn4rd 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 ball2c+nt.zu; ebrw5skn)4t7 kqo0 paie1 and its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees9k :j bh*j ;vflr h4e-cy4nj+f a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force neces n+f-h4; j4h9jjble yk crv:*fsary to stop?

  00.26: A 500-gram ball moving at 15 m/sgpb d9ea 7c),nsi z vp3e9s.k 1lq6s*vh1hr s- slows down uniformly until it stops. If the ball travel s,p7 geln1crh3zqsi dssb9)*phk-e av16v 9.s 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses b5elo 892egyv ms1i/ cbut identical kinetic energies and the three following i/l5yvs 28o9 emgc b1estatements. 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 vertically in the air with xc jx8ww)v5x; an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highe x)ww;jx 5cx8vst point?

  06.20: A boy jumps from rest straight upward b2zxp .60w h8eb ++/gvl jd2hgb mmll:from a flat, stationary concrete surface. The boy, of mass M, leaves the cj/2 hd2m8 :bgpgzl.x v l6lb++w0hebmoncrete 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 the concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH ab a gq,jjhj)m977b:ay rove 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, what is the magnitude of the average constant force exerted by the ground on the object while coming tajy:mgrbqj,7 jh 9a 7)o rest?

  12.48: An object of meo +rszfqdf0/oqt .36c8vbo7ass M is dropped from aheight H above the ground. The object bounces off of a horizontal surface in a collision l/8brt 3qoq76 do+ fev0fs zo.casting 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 c u2f,;(cwug op-ocv pi5,z2xs* /qbggord length L is pulled sideways until the cord gwg p g2qco- 5u;(buzsx,*fpco,v/2 imakes 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 an oznww,fo z/7isbtf+hp:q 12 5gle. 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 back1f7n, t:ho w b5zfw2 spo/+izq 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 yn5 xbh jaz+k))8b,9mmki qn4*su8 kfmw2 cs )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 +ys nc)*s x5fw jzk2mi)bu mkn,49a)q 8mk8hbtotal 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 appdi6d lq, ga-d.lied 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 done by the force F onthe box forgd.,di-6qdal the motion?

  04.48: Two identical bowling balls A and B are each dropped-w ak4q5ywnujb)6 j -l from rest from the topawuqnkj-6 4y) - wjbl5 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 of the two balls changing?

  11.28: A person throws an b:-.go xxih9) fhwhn(object of mass M straight upward with an initial non-zero speed v. The objectxg9fhh .- :( )xwihnob 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 km-7zlyb0 , vgconstant of 20 N/m. The potential e- 7l,zgy0bmkvnergy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the3 yo2,k2up e ( lpbg2jqxr)as93tp3k cm1h/ mz maximum speed it can impart to a 2.0-kg object t q(y)j9kh 2 l,3g/zauc2p3r3pmosxbepm1k2 ?

  

  10.31: An object of mass M starts from rest at the jivg 8 4um6r19;g9klqqdvu:u 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 thm99 vg8kqujlvgru: iuq d4 61;e same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.