97.01: A force F directed at an angle of θ above the h25jaa q)r ,ocs3vb9-mjn.vha; hud( sorizontal is used to pul3;sha5dj ( aj,r .)sv9nb2qc h om-auvl a crate a distance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is moving towa r5;v s a7v,jx o,iviz)h.f-thrd her with horizontal speed v. While bringingivv7jozhh,5x.-,;)ts fi vra the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction labor t bhvc:8jedu)msa +vc71-s7 )ioi6oq er holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the wala187jtm +6ueo vbh7 s )cvids c-o:)iqlboard?

  17.11: A 5.00 kg blocig1h.;sw py53x2 dz1d4yzyeb k 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.wh5y2 esx4 d31.1pb i; dyygzz0 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 uzx s ee*b+vm/yd/8p6 ggf( .bzniform acceleration on a horizontal surface for 5.00 seggx8* 6d/zbmy+ /pv(e .szfb. 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 force directed to the right is exerted on a 3.0 kgj7k;:w,at6 zn ud8osg block for 5.0 s. The block was initially at rest and slides on a horizontal s 67swtzdjukgo a:8;n, urface.
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 ;.7e4wu 5 qy4g7 .xnxn dhel2snjl:kmright is exerted on a 3.0 kg block for 5.0 s. The block was init: k2ynx s7nueh5;egj4l74 q x l.mnwd.ially 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 frozenki.t gr c+gj (,r:dronm3+ ,lt pond throws a 1 kg hammer in one direction. After the throw, the hammer moves o:ggr(rrkm3cn +,+j .dloi , ttff 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 ittfd+),:nskf -:yl8kutdx6g w kinetic energy. An hour after the fan has been ttk:dtlfyns,+x -g :6)u dw8fkurned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg h 6n -8w;jptmna hoe5o2o g:nd(as a position of 3.0 m, a speed of 4.0 m/s, and an acceleration ne(wad5:nn j;t omo82 -pohg6of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks edf/wzs1,6htgl;wo) is on the middle 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 floo1wdsfz6/ e,)wlh;t g or, 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) of uv;8uv6 z.+a i0g 4oehgxvnf0power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65 mph), what is the magnitudvx.nvo0fui+8ggu z hve a 064;e of the retarding force acting on the car?

  09.13: In the figure to the right, a box moves with speedk dx*.v)3q u lt5miq(z 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 constantd m(lk.3)txuiqvq5 * z 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 d;).5sys2mdo i* hazrbox moves with speed 5.00 m/s at the bottom of a roug* smia d5);y2hr d.szoh, 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 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 rox)u:ce ( fzyt1lcw-)ight, 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 Car1ol) (): ezccytfw u-x 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 y4ue2 lyo 5hq2ta jo,+the time interval of the acceleaqo yy 2 tolh2,5je+u4ration?

  12.08: Through what distance does the object move during the timyn* g hux*c(/be interval of the acn( * gycx/u*bhceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is chazwz3i61-r tbs 4ipiixj+c/ iw7qz,8znged from 6.00kg.m/s to 14.0kg.m/8iii3i zizb-ctzpx+/7sq1 r, 46wjzws 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 36.0 J of kinetic energy while4j bjp1w8m/gh its speed is increased from 2.00m/s to 4.00m/s. Which one o1 /gp8m 4bjjhwf the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal mniw71.7 xywa. l 1ptuis used to pull a heavy suitcase of weight mga distance d along a level floor at constantw7l 17y1. tmxaiwn .up 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 upward - m m qklqomc+:ep0*2d+q- yoekef7+tforce and delivers a useful power output of 0.10 w to raise a block vertically atm0+moe7cmlyfoqeq* k+etk-: qd- p +2 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 surfgq8 v dlf2focgkd ,8iguswfh9s8*: * +ace 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 the following choices best represents the amount of work done by the gravitational force act dok,8q* u*f+fg 8vsgi:w9l2g 8sfdhcing 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 h dk-*y u;3svg+b2eech ard floor 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 ball and its h-scby+g3d 2eu ;ekh*veight h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barrier ahead.t 7nf(1p6h wn,hns. cw 7f)zcj If the car takes 95 meters to come to rest, w fn6scncfp.h1w(j77)n zwht ,hat is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows dowc/ikf u8c q3n.ep0fyw;c6a ,en uniformly until it stops. If the ball travels 15 m/e3wy c. f6enca ,;fkuiq0 8cpeters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two labamoq:n hxqef/ y4 -1dihu9(7mzi8ns 0oratory carts of different masses but identical kinetic energies and the three following statements. Which 7oy msnue 1i /dim94f(n: q08xhza -hqof 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 isms-;: cveeha/htk 1-)ked isqc+w+3b yr7du; tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential e7/3c r e1hs-du +:ih tew kqc esv;mb)kay+d-;nergy when it reaches its highest point?

  06.20: A boy jumps from .8jnlap.p: rxhk58uarest straight upward from a flat, stationary concrete surface. The boy, of mass M, leaves the concr.ppanu:r88 a5klxh.jete 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 M is dropped e; t9ijx;7zc ffrom aheightH above the ground. The object crashes into some soft earth and comej; ztc7xi;9 fes 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)2jrri96bcdjp *b ysq9 7n7sv8 wb p(e ground. The object bounces89v p n7c 2bwr)djs *y 9qse7brjbi(p6 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 during the collision with the surface?

  96.38: A pendulum bob ma pm 05ugztnn;90wy,jass mon a cord length L is pulled sideways until the cord makesgnm y tpju090 5,a;wzn 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. The slxb ydn(1i1 ;81 xz w3ohhklissabg38 3ed, which started at the h gn31iy8z;8(sx1w3oldxbib1a 3hks 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?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 10-meter ramto s.2sq 3qgare10 3 ki6g*6jmh 2cwzpp 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 b3o*1 i632pwk 0sq.r atqm2seggc z 6jhy 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 for the 6.*,jr.,ihbutb 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 bb*,.itu,jr hwork done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each droqbo51y7mwp/io3.c ay* u pqi4 pped from rest from the top of a tall tower. Ball A is dropped one second before ball B. After ball B is droppedwy ipmi 4*ooc3bq .q/pa1 uy75 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 mass M straight upward with an initi,8eh*ygymth 5qg4al 7al non-zero speed v. The object rises to a maximum height H above the laung5, gqmyh*h eyl8ta4 7ch 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 str py1 2*az2l4 j xp;rome3-iumletches a spring that has a spring constant of 20 N/m. The potential energy stored in the spazpiup j* xr4 ;m2 3m-eyol21lring is:

  97.10: A compressed 5ebb/-v p6ve rspring has 16 J of potential energy. What is the maximum speed it can impart /bv5 erpev-b 6to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bot 3q rr9fn,5 y a/wjac55wzbf7utom 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? 35qc,w5y/7wrau b fa jf z59rnAssume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.