97.01: A force F directed at an angle of θ above the horizontal pgco ihkkq7m3c8z- u7xv ::3xis used to pull a crate a distance D across a level floor. The i xoz3-ck3g7:khu cx m7 :8qpvwork done by the force F is

  97.33: A softball player catches a ball of mass m, whicho -1v.rb0vy)kac-al p is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back1-bv0c.kpo)a-l avr y 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 meter ab2w qpk8rdvfd)o h,s1ci rgbw8e5 ,k5)ove the floor for 4 seconds. During these 4 secondshow much p, kb opwrc2wfv5)5) hg1k8iedr d sq,8ower was expended on the wallboard?

  17.11: A 5.00 kg ct t xuye0upv32:z 5 dflk(e8.block slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreasd3zcvlke 8ft0txuy.p u(2e :5es 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 uniforg p hs4,9(8usa27t xrq ni5awlm acceleration on a horizontal surface for 5.00 s. pqtalwuxi5 s287 (, gasnhr49The block’s kinetic 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 directed to th+d8htg0g(agvf9c vv- 7exq e :e right is exerted on a 3.0 kg block for :q9v+ xd(0gg- 8aveeh v gc7ft5.0 s. The 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 x7i el mp -ch(1scci/6to the right is exerted on a 3.0 kg block for 5c ehm (x 76pclsci-/1i.0 s. 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 reston a frict ;jn:6za mh0 x5czzrw.ionless 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 followi.60xa z5hm:rzjzn; c wng correctly describes the above situation?

  03.14: A fan blows the air and gives it kinejg0 o: i hfuojw84l8-htic energy. An hour after the fan has been turng ijl u0h-w: fh8oj4o8ed off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kgapbw2;5 pk b(x has a position of 3.0 m, a speed of 4.0 m2abb(p5 ; kxpw/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 mi6a;j1 p* cjsmuddle shelf in the bookroom 1.3 m from the floor. jpu1c*j6s; m aIf 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 box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepower) of pow:;pwgdtl /1p eer 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 tp :/et gl;1wdphe retarding force acting on the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s at the bote;fgxb3 eod g3if -8/v34ndxi tom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the incline as it is being pushed directly vng;f /ge83if xoe4d3-3b xidto 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 moverm9n g/.- l;rm2 qolvfs 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 asr2ll gvo;.fn/ 9rm-mq 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 ton j/lm4: xqc7uz7dk6x5 /pxb d the right, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Caxx7:n 7j /b4qck 5l/dzuxmp6dr B has traveled the same distance F, what is its speed in terms of B?

  12.07: What is the net force vphd739bob y b bjbo-t77 z-;xacting on the object during the time interval of the accelerat3xy b7o ;-do jbp9-hvbbz7t7bion?

  12.08: Through what distance does the object move j*rnv2sog1(g during the time interval of the ac njs (1*2orgvgceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is 9d ; kaq,ifge5changed 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 eng;9k ,ei5qd afergy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic g,9nqlmi,vw.+z b t1henergy while its speed is increased from 2.00m/s tot+n im9vq, zlw1.b,hg 4.00m/s. Which one 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 to pull a heavy su cdie6k1 co,+wgeb9t8meg -m,ath p13*i,rxvitcase of weight mga distance d along a level floor at constant velocityb*,awig39mt1 mx6,ecked 1-hovg i,tc +8 pre. 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 sm03 al hzee*-force and delivers a useful power output of 0.10 w e3-0zeh*amls 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 relws45wfj zh74w eased 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 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 obsjz44w w5fwh 7ject during the fall?

  96.18: A rubber ball is held motionless a height ho above a hard floor and reml8bz;yhxm6b/r9f7q/ cnmp (pdb ; i-leased. Assuming mpf7b m9q z/mcry( 6;p- bn/dxib lh;8that 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 above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a ba: t*4d4oe(fsjs2kcud5ck6 kurrier ahead. If the car takes 95 meters to come to rest, what is the magnitusuot ujd:44dk( *2ceskcfk6 5de of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows dow wkd+s9a*b) xs c,p wlrz1-nx(n uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while itkp(xn*w,-) azcbsr wsx+9l1 d was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kinetic j 3r22 eg 3xg* bwru6pr.(uughenergies and the three following statements. Which of the above statements w2*p6.3bgrju u ex3h (urr2wggould 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 d :wuqkf+yf,*in the air with an initial speed of 4.60 m/s., +uw*:kqyd ff 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,xg s f(dv -cuck*+kw(* 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’ k x(gv*kf - *cwcdu(s+s feet and the concrete do on the boy?

  02.48: An object of mass M is dropped from ahqsa-q * x*yy1py: dsg:f )0fsseightH above 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 thag)yss-f fyy*s :* d0x:q1spqe 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 w1e ltxb /9gheu +c2c2;l4lfvground. 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 the average net force acting on the mass ; ct212 e e9vb+g/4fxclul wlhduring the collision with the surface?

  96.38: A pendulum bob mass mon a cor ce ayo m x5/1u+74pszix-1tnld length L is pulled sideways until the cord y/4p1 os1 axtxcu+- l75 nmzeimakes 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 1 fvbki.w+gf0 v)d4yeincline of unknown angle. The sled, which v.i4eg+k f1vwd0 )bfy 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. 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 83n(e ,:7tj ims w(6;msjwh( loifdfnfrom 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 move them to the lsf mf8 t 3hw(7niejnw:;(ljo( 6d m,isoading dock?

  12.16: A constant force F=50N (as shown in the figl ,ynirbmh(35p,h 4zdure) is applied for the 6.0 meter motion of the box upward along the incline. The mass of the blmp rl(5z idnb, h3,4hyock 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 eaw;1;sbw cbd;jch 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 of the two balw1c;b ;wdb;jsls changing?

  11.28: A person throws an object of mass M straight upward w3g;+zdygv i42ydyco+gd o11 rith an initial non-zero speed v.+g; zyd io gyyd12+r1 v3codg4 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 s0 axew3vgg4 5:yef0lr 8sz/vrex2 9jh pring that has a spring constant of 20 N/m. glj9vh :3eezfxv8rxea sr g0 5/2y04w The potential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is tlcp2 ;bc.w a2ehe maximum speed iba2clce pw2;. t can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from vh, 3wqor/0ac rest at the 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- zeawh v ,qc/or03ro coefficient of kinetic friction between the incline and the object for both trials.