97.01: A force F directeda,vucnp)e7:(oe zd s2 at an angle of θ above the horizontal is used to pull a crate a distance D acrood ne cp,v:s)(ae 72uzss a level floor. The work done by the force F is

  97.33: A softball player catches a br-x9f k qowg8-l(m ln3all of mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exerted oll9 8fxow3- gk-rqnm( n the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 3 meter kkjd98x*7 x3hli/ ia qabove the floor for 4 seconds. qikhl7jxx3 8adi9 k*/ During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block c o*dmki19:.p l, to*jbwtsk.slides 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 ,cb. twodik:*9pjl*.o mtk s 1J in this time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides with unif:z2 xyu cm7+,y w03c75r ffu,ejxfigvorm acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictlyzf727g,wc ux5jyv i 0:e+y m,ufxcf3 r 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 exerted on a 6m 2ftkjrrby.0;p 6yp3.0 kg block for 5.0 s. T6yy0prm pfb2rt6;. kjhe 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.ynurjd.:wsi; a t1/-ump a+c a 3.0 kg block for 5.0 s. The block was initially at rest +;uyw djct: /-u. s.aaminp 1rand 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 frictionlessut6x+z si -mlt:8wa6b frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the student movea86:z tl6+sw -uixmb ts off in the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kih2,jxj 8usw( nnetic energy. An hour after the fan has been turned off, j8h swn,xj(u2
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 07euhl2sy3+5t(xcicdvk 1/p j.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an accelerat hc7c vkid lj/p(yu+1e53sx2tion 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:x rll7lk, l:hk; f6o .djppn8 bookroom 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 box..,kl: 7j fpo:rkhl;6n xdllp 8 The box has a mass of 10.0 kg.

  02.32: An automobile6yfv rdl39ijm0r 7m.t0 t mat)ma.*03kavxky engine delivers 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30vr33ak fm 0mx)amjdr .7mk*t9. tlytai60v y 0 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 movesm u/:4 *)wezvh:re+:emlhg l m with speed 5.00 m/s at the bottom of a rough, fixed incliem/l m:l4m z+w:r*h egevuh:)ned 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 o rgt9o00 2:bp o)vqrm2uu) twyne0 (r5.00 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, 00: m9q0 2rn)eu gwuvo2o ptr(yrotb )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 starting from rest, along y u ax:o5d/r(ito 1v21u- hpu5ryhs*kg-il1g a straight road. CarA has twice the acceleration of Car B. After ta ou1 lus gh-uy1id*/:5vp2i1 t (5xrg-ryo hkraveling a distance F, Car A has speed B. When Car B has traveled the same distance F, what is its speed in terms of B?

  12.07: What is the a +x0qef3 9m *erp(zsnlm9 7w.t czou8net force acting on the object during the time interval of the accelerat3qpomu fa97tx *0.rcsz wl+eezm8n9( ion?

  12.08: Through what disa 3/tgjfhvql1z*v/,23 z 2yj q yccv3itance does the object move during the time interval of the 33vqa/ lj/2gzvy1,*y v cchqfi zt3j 2acceleration

  12.19: The magnitude of the linear momentum of az5oyq *n+ge)c 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg. cn+o zy)5g*qem/s in a 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 s9-rr 0h+s torj0:nm/t o1ofj 36.0 J of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents oh /r m9t j0oto0rjs1rfn+:s-the mass of the crate

  94.38: A force F at an angle θ abo1*+ 8 fo ne8 jcvcjuz;,g ecpz8eh;jz;ve the horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor a 1e8zzpegn, ejh;88cfzco+v cuj;j* ; nd the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force and delivers a useful p 2q cekiqnbu3jszg+, 2n ue:,)k 6z:-nk)semzower output of 0.10 w to raise a block vertically at a constant speed. A,3 nsj2 6kng:zzi) sk)q2eb:kuucqe,z- me n+t 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, theyo50)hr mwwar63,cj d 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 objey5 m,rw)dca0woj6 h r3ct during the fall?

  96.18: A rubber ball is held 3bcnicax-pv6:fkyz1e .qo 8 3 br-;h emotionless a height ho above a hard floor and released. Assuming that the collision with the foqfp6x1z-arebye.nk: -c3h;ci 3 8v bloor 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. The5y5,sk;r xrz 4cp 0h2/f jwpza driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of thh,f2 5pzzy 5kj/rcrxsw4a0 p;e minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down iijcs jjadjn-b 57r8 :t6:9/groyv* iuniformly until it stops. If the ball travels 15 meters, iga:-rv jjs 7y:n5i9oj8c irj * b6/tdwhat was the average net force applied while it was coming to a stop?

  02.26: Consider two lact 3vx7t94o2;w3 gmjr u bxyw ;/loc5*bwhc i,boratory carts of different masses but identical kinetic energies 5*xcw9oh c7r 33,cb i4 wvbjl/toyw;u;m gx2tand the 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 with an initial sz0.wzkapsl;5;v. n12; htnv djat /tv peed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest po5n tl ztpv1anta.0z.wshj v;2d;k/v ;int?

  06.20: A boy jumps from rest straight upward from a flat, s uc74fds 3+wvztationary concrete surface. The boy, of mass M, leaves the concrete surface with speed v and his center of ma7z+ vfds3u cw4ss 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’ s feet and the concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH above the ground. The obje/l.t7,orvd xg ct crashes into some soft earth and comes to rest by compressin7/.gl , vrtdoxg 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 gr5w -jjlurb)ln1f pr*2ound. The object bounces off of a horizontal surface in a collision lasting time T. The object 25jr*bl)nplr 1w- ufj 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 pulled sideways f71,,va:;pgnb / e kx5yeyrf juntil the cord p;ey,f/abn ,x g7er 1vjkfy :5makes 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 unknows;+4y qb;n jrtn angle. 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 slides back down the hill. What is the sled's speed when it returns to its original position at the bottom of the hill?tbs r4jq+ny;;

  06.09: A deliveryman moveat vcxtca 96fup:60 x4bh-ks5s 10 cartons from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If eu:hbsx6t c0t5- a94fxapv6 kc ach 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 taq/l+ps i ;m2ghe figure) is applied for the 6.0 meter motion of the box upward along the incline. The mass opa/+;gq2 mlsif 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 rest7j;pp qknd70o( wp+x ya m28mr 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 twon 2d;mj8o+ w yx(pmr apk0pq77 balls changing?

  11.28: A person throws an obj vut4+d9ldw l,ect 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 the launch point? Ignore air res 9+,ld4wut ldvistance.

  96.20: A force of 10 N t l3d)up jh.8gstretches a spring that has a spring constant of 20 N/m. The potential energy stored in the spri.d3 8g)up hljtng is:

  97.10: A compressed spring has 16 J of potential energy. What is the: snm7ve0xw8rwz6 /a:vu(h qn maximum speed it can:se7 q v n6wnxw:ruh/(v8mz0 a impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bott ,mf*sx o+uqox)8h4 tmvh11 nkom 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 comparemm k+nuhsv o) *otx84fq11,xh for the two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.