97.01: A force F directed at an angle of θ above pasvc f6.c2 8u)d w aag2sun54the horizontal is used to pull a crate a di agcu642aa.vns)uw5cf s 8dp2stance D across a level floor. The work done by the force F is

  97.33: A softball player catcdq ldqg4pf;- 3hes 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.4 g3pdf;ql-dq Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 3 m*u a6s:ti;gt9 1alohzeter above the floor for 4 s:hi 1l*gzu;aot ts69a econds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform. 8ajrse l3um1 acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly dec38mujl1 sra e.reases 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 on a )ru j0x5zp r-kgcd4w8vlpj7:horizontal surf -)jwzp:lgvpcxj 5k0d7rru48 ace for 5.00 s. The block’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 fo,f)w uxg)w rc:rce directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a :)rguw w ,cx)fhorizontal 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 e)p3 nnd:dos , rrk4xhh5s; hbwlq4m ):xerted on a 3.0 kg block for 5.0 s. T)kss m 3rxwb::,dlnh ;hrp5qhdn4)4 ohe 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 frictionless fra(q fqasvf.up1b1y(4ozen pond throws a 1 kg hammer in one direction. After the throw,u1(sp qa(f1 4yqafv.b the hammer 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 bh48vqwq q0h5gives it kinetic energy. An hour after the fan has beeh54wh 8q0vqqbn turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has(el oxu 7 o el;p32isg*)ym0 l,g:iq 7dwy7jlm a position of 3.0 m, a speed of)3go x;s7l u* glme wiej2(ym7pl iylq:d0 ,7o 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 / x0 g3vzzop;dmiddle shelf in the 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 wor3; zvp x0g/odzk 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) ofqc 0x (sbc2xzgl*7g41 el7t fh power to a car's driving wheeg20lx7t (hs1xgf7z4*elcc bq ls. 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 with speed 5.00 m/s at the bom10+ar/bcla54h fh e qttom 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 ofF = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/ml5car+1ea /fq4 hh0bswhen 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 wjg + f fqz/v,y+rf18vmw+p-sdith speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The b +vp/1ffzjfd8 +msrg+-v y,qwox 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 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 fru,sn /g,. nr3bph7ebi om rest, along a straight road. CarA has twice the acceleration of Car B. Agn,b b /u er,7hs3p.infter traveling 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 net force acting on the object during the time interval ofq6rl4 n.eqg nyp2)h -m the acceleq nl6pqg4 ryen2 -).hmration?

  12.08: Through what dit:dbnk8qv58 s stance does the object move during the time interval of the acceleratio88tvk:bnsd q 5n

  12.19: The magnitude of the line t5k7p*qnbbx0ar momentum 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 tt n p5*kx70qbbhe mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is increas*m-4gm,t i+ad r b q-dtqfq:;zed from 2.00m/s to 4.00m/s. Which one of the following choi;+m:m -a dtrq4*bf,z g-tiqdq ces best represents the mass of the crate

  94.38: A force F at an angle jr(qouxqk..u 4 62lbu d5nb 4y θ above the horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. u2k5 byoq4rlu6xqdbj( . un.4 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 upward force and delivers a useful powe9grq5/ s); 2 wvt .:avqa1mrhza6; j5yz wytscr output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this cywv sy6 r 5zzs tw:qr;gt/qaca91 .) h5a;jvm2rane raise a 0.20 kg block?

  12.18: A 1.00 kg object is 9cg q,.p8 ;cdn1 y(iopxgrgd,released from rest near the surface of the Earth, the gravitational force acting on the 1.00 kg object by the Earth does c ,dg18;9ixp ,ggpd.(nqy orc10.0 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 fall?

  96.18: A rubber ball is held rwgc6j(58;e+pshl fzw) g p; c7waxn8motionless a height ho above a hard floor and released. 6c ;+7gjwgpe w5p8)ca; wnfzx sl(h 8rAssuming 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 ball and its height h above the surface?

  07.06: A 500-kg car is moving athwnt6)y xmv4 .1rifjv8o c:(a 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to co y6rv:it)f.on 1v 4w(xcm8ha jme 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 uniforqbx0:opnp 3pw .0du,smly until it stops. If the ball travels 15 meterqp.ounwp s3x0b 0p :,ds, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory9sh dr7sxl nzw4u9 ,(c carts of different masses but identical kinetic ener( x h ls,r99nu4zwdsc7gies and 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 /xv8m cc+(,nj jwely0/jlfi4 air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches it cl84/ x(f+/jcie nw0mj ,jyvls highest point?

  06.20: A boy jumps from rest straight upward f7rpcq xvnca h +c,/8-hn04t,sc6t .iixt.wuvrom a flat, stationary concrete surface. The p64cwrcqix+t.c h-v7u8t .n, i ahst0 /nvc,xboy, 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 normal force of contact (N) between the boy’ s feet and the concrete do on the boy?

  02.48: An object of mass x lw557ev. +tbkk6nhs M is dropped from aheightH 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 theb5e 5 .6 lws7khntkxv+ 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 g/joflanp g86z 92n)kw round. The object bounces off of a horizontal surface in a collision lasting time T. The object tan)o6w8/p 2nzgj9fkl hen 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 mass7l/cg j1r wf8c mon a cord length L is pulled sideways until the cord makes afwr1/c c jg7l8n 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 al+jz;bcb ) n9n uniform incline of unknown angle. The sled, which started at the bottom of the incline mov);nlzbnc 9j+b ing 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?

  06.09: A deliveryman moves 10 cartons from the sidewalk, aljq7wlxgjt9zx /f1fk1o m,, j5 ong a 10-meter ramp to a loading dock, which is 1.5 meters tz9 1x f/ lw5,x7okgmjj f,qj1above 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(w3vmkz q. 3 2tzppv;u for the 6.0 meter motiotmu.; 2qp 3zw(kpvv z3n 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 force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped bester9z+()u from rest from the top of a tall tower. Ball A is dropped one second before ball B. After ball B is dropped us( ez9+rb)etbut before 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 n yfyf5 (:)+maqvs6b, brau2 qupward with an initial non-zero speed v. The object rises to a maximum height H above the launch point. The person now throws ay, a2)uryqffs6 m+ b5av:qnb(n 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 oq7z;kx6t vo.o*ojvc01 s f+q sxbz9*eiu2 iz/f 20 N/m. The poten+1 foszu7vxt*kz2xv0s/b eic*io;zqjq9.o 6tial energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential enetw7qq;kcawww :.5x:;t:il y ergy. What is the maximum speed it can impart to a 2.0-kg object;;:w 7qtxqyww:wla eic:. 5 kt ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed inclinq:-3wzt-o7 sfcxp c7it9r sn*e 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 triaswtr 3cnz*ft x9p7 :7scq-io-ls, 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.