97.01: A force F directed at an angle of θ above the horizonttuq;7b, s ;5 p0ttbaszal is used to pull a crate a distance D across azbt0q;sb;,t5t spa 7u level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is movinqz ineg m;-h+,g toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced.zie,hq;gm +n- Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sh1zy5f3uhiyakv )qlv 5 - ptr:r) tf15reet of wallboard 3 meter above the floor for 4 seconds. During these r 5lfukri5 5at3r)p f1 )t1q-vzy:yhv4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleraozf0m 6p)tr1qx pn vkxp;1m8/tion on a horizontal surface for 5.00 s. The block’s kinetic energy stric8/k v0of6r1pm; ppx zmn)tqx1tly decreases 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 uniform acceleration o3wn q83d sd 7;ns bawz0aq87wsn a horizontal surface for 5.00 s. The bqnbd3wz; 7q aswa 8s0w78s3dnlock’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 the right is exer l*m)w2clwekelx(,41a swo7h ted on a 3.0 kg block forme le* ,o27 1lwx 4ac(lhws)wk 5.0 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 to the right is exerted on a 3.0 xt2eqtt 6, i5rkg block for 5.0 s. The block was initially at rest and slides on a horizontal , exit56ttr 2qsurface.
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 1wsoh,, 1y2;tz jc -5ilgnsbjthrows a 1 kg hammer in one direction. After the throw, the hammer moves off in one dir,hij2ygs,o;wbz15s tjc 1l -nection 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 kimm(lp67nu ) qpy.) nwy5xq .rinetic energy. An hour after the fan has been turne.i6mpp )qxy5n qymu7) wl .(nrd off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block off f 28ia+swo9tq.yn4gnz: ftwv/6fn- mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an accel8:wff4zn+ o fnf/g yav-9stn. iw6t 2qeration 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 gb.ad9x ;:li dv*q/87a wyyig1b wu5u m from thd bbdyi9v* u5 .8/1:wxwlu7qai;gyga e 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 box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepower) o-yrdk+d7)omc a2h6o,g (ozny f 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 d7(aoy g,yo6hcmk2+dro nz)- of the retarding force acting on the car?

  09.13: In the figure to the right, a box mov(f5tu:epy(.m x *a anees with speed 5.00 m/s at the bottom of a rough, fixed inclinex*5(ne :f (y a.emuatpd 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 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 bott ae/uwlm,qp putqq 51* co5.x-om 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 k.ea*uq,q5 mqxw-l15 pcop tu/g, 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 sajql( ndk8hdm( n084pe/j.wm ; v njo7tarting 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 Car B has traveled m7w;ah/k 0pol8j n (. 4qjdevnj (8dmnthe same distance F, what is its speed in terms of B?

  12.07: What is the net force acting on the object during the timegvq7*foq a 197sv m 7cxdbsw:1 interval of the accebxfs 1d vq7gos *wv:q717ca9 mleration?

  12.08: Through what distance does the object move dxb vs;s9cch.3gy10)m j g;koruring the time interval of the acceler;b1cs 3). cvkshxo;jgg0 my9 ration

  12.19: The magnitude of the linear momentum blv f+v m :*7:wg 0kddmliw)93kvhwa7of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in avw+f *b)walv9l 7hd7 mmi30w:g k:kvd time interval 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 :smd-(w 6rq2bbg)q pp jce6x )its speed is increased from 2.00m/s to 4.00m/s. Which one osegpdxp)6q-jc6r bm b2(:) qwf 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 heav5q9lb4) f8gcbf-;zyn dcz9 yj y suitcase of weight mga distance d along a level floor at co9)9lj48 ; - gznb fzfyqbcd5cynstant 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 upwacpz2f ldg5,8/g. neybj,:u z ard force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raise5gfu g,lab8:c j 2e,z z.yn/pd a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface gq4-)g+rny*b scanc) of the Earth, the gravitational force acting on the 1.00 kg object by the Earth does 10.0 J oab g qg)*rc ny4sn+c-)f 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 fall?

  96.18: A rubber ball is held motionless a height ho above a hard )wj6.6l e+jz +sta6t 6gid jmkfloor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relationship between js)e l 6k.6+jjtw6adzmgi6 +tthe 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 barrie+5 5+ 99ie)osxr fntwlovw5nfr ahead. If the car takes 95 meters to come to rest, what is 59nnr f95 )+ovitewl+w s5oxfthe magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/g dsa8q2x7q 5gs slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it 7 g8sda5qqgx2was coming to a stop?

  02.26: Consider two laboratory carts of differenfpzwrw5sg /1( t masses but identical kinetic energies and th /zgpw1wfsr(5 e three following 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 vertically in the air p 1upy 1x:btk)with an initial speed of 4.60 m/s. Ignoring air res1x1)kpbt :y puistance, 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 conck0si yha3c9raab. 76 rrete surface. The boy, of mass M, leaves the concrete surface with speed v and his center of mass rises a distance d to the h7c3 s9 a.yharr6ak i0bighest 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 dixgb n tc81edp5+8t d1q1gxa5 t5 fn(zropped from aheightH above the ground. The object crashes ieqx t+abp5d11d5 1 xtt8n(zcg5ing8fnto 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 Miqb. vpp3dm js),f,j0 is dropped from aheight H 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 mb)3i.q,f0dpjmvp s,j agnitude of the average net force acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord lyu;))) nwe w yy o uw,gt8qw8hvzw..:hength L is pulled sideways until the cord me).wwuy oyvu;nqy8).):, thw8h g wwzakes 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()7 wla56csrbvt +zelgle. 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 sbt65l 7 )er+cwa sv(zllides 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 vy uuao*,8ino8ex6/m from 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 loay 6,8nux/avoi*e ou m8ding dock?

  12.16: A constant force F=50N (as shown in the fig-0xuz3csa3 pfzo; x 0sure) is applied 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 forcfc0saxxos zpuz-;3 03e F onthe box for the motion?

  04.48: Two identical bowling bae 9n7zp0r aevg+ y5vepynuc+ me85. +hlls 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 B is dropp+e+p857 90 c+ur5e p ymvyze.vanngehed but before ball A strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throw v ott8:8dwon*s an object of mass M straight upward with an 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 straight upward with initial speed 2v. In terms of H, to what maximum height does the object of mass 0.5M rise above:8tnoow* t8v d the launch point? Ignore air resistance.

  96.20: A force of 10 N stretc.c lru * n1kd-hj y-.yiyx18pehes a spring that has a spring constant of 20 N/m. The potential energy stored in the l1.pyein-8cd.1y h-ujx* ry kspring is:

  97.10: A compressed spring has 16 J of potentialpvcr0 uct 4bxt u06r2-rx4 v1m energy. What is the maximum speedcuctt v2b -x v064 r4rupx01mr it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed ia;a 0p l)p:c0(im esodncline of height H. A person de 0(sppodcia): ;0malecides 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 object for both trials.