97.01: A force F directed at an angle of θ above the horiz, caos9u:lr)amxi61s ontal is used to pull a crate x ls9)u,raimc6 1so :aa distance D across a level floor. The work done by the force F is

  97.33: A softball playzs +v(n8 +2s/decgmu1ernitwm- + m-t er catches a ball of mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Asw 1irve8edzg/+tscmstm+2nm- (+nu -suming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 7:fo6bh -ozyx:w pyx; kilogram sheet of wallboard 3 meter above the floor for 4 seconds. :xho6oxz;- ybwf7 py: During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slidkpf71 wf(e rx3es with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in th7 f3rew1px(k fis time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slid2y jc1be2q vj,es with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this1ejcy2b j 2q,v 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 kg bl7s5g*mn m5l nlock for 5.0 s. The block was ingn n* mmlls557itially 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 3.0 kg block foru,)kttj;3ohf g8e 1(0wtbqqe 5.)f 1;,8kohtjbq g(ttq0u we3e0 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 frictiv7da0b vbbf44onless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer movabv fb04dvb74es 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 energy. An hour afterson0 va,h; oc t/y1q0gy92nab the fan has been t ;an0vnh,c2obo1ygq9t0y a s /urned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has a posiv*qo5 gn0c8jfn2crf0 tion of 3.0 m, a speed of20f*j8n0n5 c rq gvocf 4.0 m/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 middle shelf in the bookro:dujo6 4ld2*jh o8vhn ay,) jqom 1.3 m from 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 the boxaj2j*8l dyuvq) ond4,6: ohhj. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepower) of pow65qk-3 wyol*p3/ .zgzi/pcidll q lz0er to-k/z g6* 033zqclwz.d/lp 5q ilpoi ly 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 force acting on the car?

  09.13: In the figure to the right, a box moves wi/dp0i 3xjku2vkw 3r5 hth speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constanv h/52xju d0iw3r3pk kt 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 r ia8l*5w6c2gmzc dwt :fzn97the right, a box moves 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 coczlcimrz7 w6an8d259: *tfw gnstant 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 starti8.l2x+hx +/chu ,uc f4srkuqb ng from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A hk/+s+hq 4f2 ru h,u.xlxc bc8uas speed B. When Car B has traveled the same distance F, what is its speed in terms of B?

  12.07: What is the net x l /w(3i2t nbrg j 5kz0mru7)p7oqy.dforce acting on the object during the time interval of the acceleratir k2r7)j0l pb y i5qmzu o/tgn.xwd73(on?

  12.08: Through what distance does th vp;3zrys6 7g/fxu)dea vt.9p e object move during the time interval of the acc/au;x)v y p6v.p9zfs7g3ertdeleration

  12.19: The magnitude of the linear moh;89z 56 f vqpfdasizva 65cypzt*4-8zc t 3nqmentum 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 kinetic energy of -s; n3qf5 ai qat hvzcd884t9*z6c6vpfpyzz 5 the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is in z2ktv72syx-*wdz n,dcreased from 2.00m/s to 4-, *dndxz7t 2ykvs2z w.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 use9kmjd 6i3c chx8 mjnpgl,+40id to pull a heavy suitcase of weight mga distance d along a level flc90 l3,jxm pi + cdmg4jn8k6ihoor 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 exertsy0h/dfkn kluyp s1zw/4kk..( an upward force and delivers a useful power output of 0.10 w to raise a y k s(1/khzy.4/wlknu0p .dkf 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 surface of the Earth, tmt3*pxp75e8f. 6wg nh t vvz6vhe 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 work8*nf3 ttwxp75ev.v66vmgzh p 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 ho above a hard flou6mwlk jj.q( +or 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 baq.uklm( j w6j+ll and its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barrier ahesq5cjfygt2,d5 bz u 66r3(hkjad. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force necessar5, 5crb6ftu36j 2j kghz(qsdyy to stop?

  00.26: A 500-gram ball moving at 15 m/s slo-- rj exf7(1 ar 87+bowolcdaqws down uniformly until it stops. If the bafa r oae1ocd jx-(77b8lq-+rwll travels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory cart 7gprd /. j;;ay+txoels of different masses but identical kinetic energies and the three following statements. Which of the above sx;7;y.pad j+ o/g ltretatements 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 hdai))ev-8:fh hle,yc8tv ywm h+y/5 the air with an initial speed of 4.60 m/s. Ignoring air resistf)ve-a ,8hy)vel/yhhm wt+dyih: 8 5cance, 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, stationary concp-yutyyi6tt c6) xz 3z,gyy/) rete 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 nor yyy-t /ug6xz)3c,i6) tyz ytpmal force of contact (N) between the boy’ s feet and the concrete do on the boy?

  02.48: An object of mw6gvfs.v 8x n ,5b90pmfo no(qass M is dropped from aheightH above the ground. The objectmn,(f o50fxg 8w6 nvosqpvb. 9 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 to rest?

  12.48: An object of mass M is dropped from aheight H above the ground. The gxdfqb/ 8ao;sqhji5b.k.1 u* 3 )vyek 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 dubu 3bof xgqa.jk ik hd.y1s8; qe/)v*5ring the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sideways s,mh4i2;0 tpoqz ko* runtil the cord makes an 2rmq0s,pt4h zk o;io*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 sledv4usrh)-/o p 9s6etm p, 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 rs9p)6-ovph t4eu s /mdown 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 cartonmmgq/g 2s 4umnnd8 t15s from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meteg n1dtms28/mnq4 um5grs 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 loading dock?

  12.16: A constant force F=50N (as shown in the figure) is applied f2 k;f m;zsvqs0or the 6.0 meter motion of the box upward along the fvsmzq2s;; k0incline. 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 ballsrt44/ nz.wtsrrvaz;aw 40f 21)shu tqs4qf k . A and B are each dropped from rest from the top of a tall tower. Ball A is dropped one second before ball B. After ball Bttkwzffns44ar4.1sra uq hz/4qsr)w tv.2;0 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 object of masstk/ye a2m4rium 4 k*3gs(/y2) oitzzc M straight upward with an initial non-zero speed v. The object rises to a maximum height H above theo3 t*ezr 2kzk(t/u4)ig2ycismm ay4/ 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 sprin j3k1nom 0e,s;8 rm6 jo4zddueg constant of 20 N/m. The potential energy stored in dzs1j6er30m8 e, juokno;d 4 mthe spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the maxim+9 j 89dgu ;*ebzpjcjkum speed it can impart to a 2u 9p8gkedbcj9z +j j;*.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incl (3z j.-bn6oh ww)p,gl0nan/mcpkc 0d ine 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? Assume0hwc3 (p/k l)c6nn og.p db0-,manjzw the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.