97.01: A force F directed at an angle of θ above the horizontal itj , qztyw4 /bzf01f9bs used to pull a crate a distance D across a level f/z1ttj,y0z4 b w9fbfqloor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is movi ;etl,d0;re vhng toward her with horizontal speed v. While bringing the ball to ; ee0;tl,dr vhrest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborep+fp6oogx7a3k 9e)k pbkos w udg: 09,r holds a 20 kilogram sheet of wallboard 3 meter above the fauo+k0s)9:7,6p3 kg9kewg f b doxpop loor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides wit0o-63 hj rv-yg op9exb992cs rdioih+h uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 sgooj-2d9h3p6hrbe0yi 9 -co ixvr9+ 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 uniforu8jc479ut2agyz z zfk ;u72l z3 g5rvem acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 2 9ug4erl8z z ;7yu75gk2zcu z2vfja3t0.0 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 xsly0r*j* ; ynthe right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surface. ynsjy*lr ;*0x
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 3.0nzj6mcdt /.x;q,6zg ,l, uphb1c1zuz kg block for 5.0 s. The block was initially at rest and slides on a 6 ;hczp,1zlu,1,jnz.bt 6u/ xqz m dcghorizontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a fricq1dm e uih)zdd4ir2 /(tionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer 2(/zddmu14)i ehdqri 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 givepzb9 ky0b0jn2sqt8+ocz0 .dms it kinetic energy. An hour after the fan has been turned of + nz0 sjy0c08zpq t92.bkdbmof,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has uv o7yjd*elga+ r97y4 s rep .4plt2e;a position of 3.0 m, a speed of 4.0 m/s, and an acceleration7s y d2a*9gupyree4v4 joe;t. lp7+rl 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 ku6(+ric-aaj: qk2 gbfrom 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 k6uk+qi - 2acjra:b(gthe box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,009unj e6x y;pt)qwa /q40 watts (about 32 horsepower) of power 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 forcen4uajqey6 x w/pt)q; 9 acting on the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s at tko6 i)wh5bvq) v08dijhe bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the incline as it is being pushed directkbqdo )i50jh 6vw v8)ily 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 mom0eq1(/l rm0u ujd6fy vq-y/sves 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 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 rlm y md0e/q6-r0q1 jfs/uvy( ueaches 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 a straigh v/o*dcv6sf-ct 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/-vs *cfc6vod, what is its speed in terms of B?

  12.07: What is the net force acting on the obje eolel q0b 1slsg e,l-u:t9/m4ct during the time interval of the acceleratiosul bo 4gmese-l,lq10l/ t e9:n?

  12.08: Through what distance does the object move during 0 f9p/zwjhrb1x q,e;/ck6mhc k6xw0g the time interval of the axh1rc /k/k,w9w;zgqejfm cx0p 6b h60cceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is lplzo:a);//o .r0csg gm i )cjchanged from 6.00kg.m/s to 14.0kg.m/s in a time interval: )jicg/.oz/)r glolac sp ;m0 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 of kinetic enlt y0i tq5o zqt8 hajrc9pnb78;6e/z7ergy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the followijq7;t76zq 5 cyaltnb8 0r98oz etp/ ihng choices best represents the mass of the crate

  94.38: A force F at an angle θ above t0q2mqrhjrhy 8/7: sss he horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. Th /s jhs0ry:7 h8q2qrmse 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 delivers a usefjd(n,8 qb fim4ul power output of 0.10 w to raise a block vertically at a constant speed. At wha 8in b(j4,mdfqt constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest nea io*:-zq2z o2rzzl+ttr 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 object during the fatzi -+zzl 2*o:otq z2rll?

  96.18: A rubber ball is held motionless a height ho above a hard floor and rel )k rcok7pf sea0ow5))eased. Assuming t5rsocaoe p7)kk ) w0f)hat 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 ac v)0m aln035*lp6 x4f* e ykx3fcyukbarrier ahead. If the car takes 95 meters to come toyl)0c33uy 4k ekxca *50*la vx6ffpmn rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it stops. p.-ih kc e pa:m l/055w3luqv,ypz-xr If the ball travels 15 meters, what was the average net force applied while it was coming to,ze-pwilh-:rlk.mpcqa 3yx/p5 uv 0 5 a stop?

  02.26: Consider two laboratory carag bg l- hu50(ocpd9d:ts of different masses but identical kinetic energies and the three following stath ( :dapo9db0 -l5uggcements. 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 withceckg 97c0*f qvv2s2b an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energys 7fbq2 c2g9c0ecvk*v when it reaches its highest point?

  06.20: A boy jumps from rest strawro *qjx3 np+y1o(,5qz rr*r yight 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 tox5rqonjyq 3+,z1 r(rowp*y* r 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 ah*j4n0: +uolnhx nktx* eightH 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 the magnitude of the average constant forcen*u + :nh4kjnox *lxt0 exerted by the ground on the object while coming to rest?

  12.48: An object of mass M is dropped from aheight hy.v e k0x1qu/5m(lk iH 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 was the magnitude of th/qil ek km0y5x(.v1uh e average net force acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass moo *.rqt(.vdmln a cord length L is pulled sideways until the cord makes a qo.(*.d mvtlrn 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 slideszmpdr5jm dw/;tf6ze-q yw2 u/ 6-eh x6 up a uniform incline of unknown angle. The sled, which started at the bottom of the incline moving at 10.0 m/s, rises to a height of y-5 6xp/ wdqmzhzde2-e/6 w6 ;fmjutr3.30 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 sid .b- fl i*-jzpjwl)2fpewalk, 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 thwjjp f2 l-bi.p* fl)-ze total 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 0 yywh(s0 sscue9d3+g the figure) is applied for the 6.0 meter motion of the box upward along the incline. The mass of the block is M=15s0+9gsywdhs yeu 03 c( 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 each dro sxt0:9qhc8g zpped from rest from the top of a tall tower. Ball A is dropped one second before ball B. After ball B is dropped but bhzq 0c t9g:xs8efore 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 upward witjf* ;u13 (xczivbebn1d4385rfc cwfovjtw;8h an initial non-zero speed v. The object rises to a maximum height H above the launch pod xtfej*i 38zf5; coc( 3w8cvbrw;vjubf11 4nint. 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 5xj yb+ ;aeubdta 06z/of 20 N/m. The potu+x;aj/abb 5e6zyd0 tential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potenti12p gmm,m31stuzmk 5e al energy. What is the maximum speed it can itg5p1 mm,mzs3m1eku2 mpart to a 2.0-kg object ?

  

  10.31: An object of mass M wxql81)k vwfrg e57 gf7tj4j2starts from 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- zero coefficient of kinetic friction between the incline and the obj1gq7)lww2v k4 e87fr xjfgj 5tect for both trials.