97.01: A force F dire i:fv av1- ,-xp ,tvx;imjey*rcted at an angle of θ above the horizontal is used to pull a crate a distance D across a level floor. The work donait ,,frvm 1vx-x ;iyp*-:ejve by the force F is

  97.33: A softball player catches a ball of mass x.dbaj y 12hym38(heh m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming 3hhy x8m1.d2ha(ebyjconstant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of ;tm 8qrgf0c( h ka6,xcoor/w/ wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power (c0 8m/wk; rtf/ro6x, oqgcah was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration o2x1khwe2o ,t un a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 Jeh1uto22 kx, w 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 horizon40 gtktxmc4 n-tal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to txn4k -m04gct 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 3.0 rday p82s*7 9pug8x kikg block for 5.0 s. The block was initially at rest and slides on a hpydap8 x8gu9k r7s i*2orizontal 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 ri zdekgvoly 6ghe5 xjxg .0/;:e2aj.p,ov k:- hght is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizo-pvg;gdgk h./2vaeo6o jy l.ee5z, :jxhk :x0 ntal 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 poneh* zqo( 5:tu1ngt ky,d throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the student moves off in th:n(yzh1go, *5kquet t e other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour after the t r;3 oe2kls(xfan has been turned off, k32;ex t o(lrs
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 u-*82xef4kg i/xs ke bkg has a position of 3.0 m, a speed of 4.0 m/s, and an acceleratiouse2xk-ik84 ef bg x/*n 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 1d3bbuc/lycz r;c+ 3u8.3 m from the floor. If the janitor relocates the box to the shelf that is 2.6 m fromb33+dr c/ b8u;lccuy z 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 2.ricno e))s( m4,000 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 m mens)()or .ciagnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a bo f.7f27womid 6(3unvoy7s+s owinx ;ex moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. Thfdoo su m26seoi;77f7wnn vy(iw3 x.+ e 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, a box moves with speed 5.00 m/s at the bot.ohj vs:xgt*c m* 0ze ea7u6p6tom of a rough, fixed inclined plane. The box slides with consp6tm* j* x g7e6sv.0uoa cz:hetant 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 u2wc 44k* t cswzo4gg5-h6j 1onnb2i.disa :xright, 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 Car2o *5c:o2c4wjsxiggwk1-i.a n 4t udn 6bhsz4 B has traveled the same distance F, what is its speed in terms of B?

  12.07: What is the net force acting on the object during jztll *mtxnsz,*4nhx85c3p*the time interval of the acceleratioxmc5*lj pntl**h48z stn x3z ,n?

  12.08: Through what distance does the object move dub8k9s o v 5h* b1tsh8ms4vitw5ring the time interval of thev1 wvm 48bs5 s is*thb5o9t8kh acceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg po4ocek1rhca ,8int mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time ine, chark o84c1terval 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 energy while its speed is increased from:tqm4 yfdchek8 6u;u6/+ h.t sac et9m 2.00m/s to 4.00m6m /;h 9au8m hsuk+f6:ct. t cqedye4t/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 stvjr*m* h7hp 5uitcase of weight mga dh*vp7htr* j 5mistance 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 upwtozb9xg p,9, ssu8enj3 ;)os xard force and delivers a useful power output of 0.10 w to raise a block v ;s)xoz j,g 9to8ex3ns9 bs,puertically at a constant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg objessl(j .fdl /;rct is released 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 ths(l;/f dl.j sre 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 fall?

  96.18: A rubber ball i35 9 ju iklb-tquvfft7+evzz y(.d50os held motionless a height ho above a hard floor and released. Assuming that the coi vjz b (7tuqk-09u35ydle.o + ftzvf5llision 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 283w:e,ymmwf* h m/s. The driver sees a barrier ahead. If the car takes 95 meters to c e fymhm*:ww3,ome to 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 sto(pflfh7hq4 pzht 1q..ps. If the ball travels f 17h (pfh ql4zhp.q.t15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of diffew)wnok tk;;3 xk .h(irrent masses but identical kinetic energies and the three follix;w k;w(rh3 otn)k k.owing statements. 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 vert/k3w3jmo x21 l xsyr2gically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, whoxjyrg3mks xw212 /3l at is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward fr5s 09m zo3dkoiom 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 phsi0o3o mdzk59 ysical 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 fdo0 j; c*f0lwground. The object crashes into some soft ejdwc f0;l*0o farth 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 to rest?

  12.48: An object of mzjtr(ox/sdn8 zp:a5t1 4q *ipass M is dropped from aheight H above the ground. The object bounces off of a horizodnrpipzs8 1t*(: oxj5qtz/4 antal 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 o qf1+tln)0xf 4 d0teho+y9zgpulled sideways until the cord mahfttefx 9)y qzn g0o+1 ldo+04kes 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 angle. Thu(o uqgz* .a:vjt,djmpk, (u,e 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 back down the hill. What is the sled's speed whenvz :g tud(mj,q( o,,kpuua *j. it returns to its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from+/eq24ir b b/j*vik7.tzigq z 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 dz t*iqeb/b7/gzvk+ 24. iijrqone by the deliveryman on the cartons to move them to the loading dock?

  12.16: A constant foe;k*: gmejv s 7,hbh3jrce F=50N (as shown in the figure) is applied for the 6.0 meter motion of the box upward along the incline.3*meev jh7s:hk,;jg b 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 for the motion?

  04.48: Two identical bowling balls A and B are each dropped from resn: 0yy u+me;unt 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, ym n+u0ny:u e;how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upward with -vv zd j ),t:*t3bfmjxan 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 strm:vtdv*-j) tf xj3bz ,aight 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 b /),4i zoaaizconstant of 20 N/m. The potential energy sto a abizi/zo)4,red in the spring is:

  97.10: A compressed spring has 16 J of ij5-us r1gt ocu g-65fo1t3g r6unhx2potential energy. What is the maximum speed it can impart to a 2.0-kgu5gu26i cr -hs j-3rfg tg5oo1tn61ux object ?

  

  10.31: An object of mass M starts from fkn0m 0,jk dsq2n0 qj4ev0 vz6 0hrzkwt4o,: rrest 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 obje4o4m0kzn0r,e: k vds, zr0wq2n0j0t 6f q hjvkct for both trials.