97.01: A force F directed at an angle of θ above tho 1qbgj-n k9guv. :k.boa0d;ae horizontal is used to pull a crate a distance D across a level floor. The work done by the force F iqagg v; b0uoa: knk9-bdoj. 1.s

  97.33: A softball player catches a ball of mass m, which is movin26xkka,k uq -fg toward her with horizontal speed v. While ,62x-qkfk a ukbringing 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 laborer holds a 20 kilogram sheeqs6dl2( / rls m,;.ofqx/ohmf t of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the wallbo ,l. f(m6/q q;ld2osmrxfsh/oard?

  17.11: A 5.00 kg block slides t sv:z q.n29qjwith uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J t9z s2jq nv:tq.o 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 acceleryj7vl u1x x;bl;i7gc2ation on a horizontal surface for 5.00 s. The block’s kinetic enexlcg 2vxl;7jubiy 7; 1rgy 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 force4nvu novh51 g3zw/ :l9yxokd ( directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at zv yld1h ou4w og/9 nvx(:5nk3rest 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 right6,so7qaifx:nre zhb 33sq 9:t is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizoq69,n37xqh osb::s 3zriet f antal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a frictionless frozen ponf e-n;bs.e)ldne9ef)c1lci0 d throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the student moves off in the other direction. Which od;n cc1l nf ie0-esl)fe9e.) bf the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour after n hr, hvfm++ ,zz7zn(-ut/ b)rtwrvx+the fan has been t,mu+/+zr (n+rr bzh, 7txntw -vvf) hzurned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block lj; * )y; awwu0dav;xdci4ap( of mass 0.50 kg has a position of 3.0 m, a speed of 4.wua a;*;a (jpc4d)vwd;l0yix 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 textfsj660 4lt3 edd fq:h4f5ck fbbooks 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 floor,shce4q5f dd03jt 64fkf6b:fl 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 horsepow70dc-ttq/g2w5gs d ga ly /hq)er) of 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 of the retarding force acting on the cq dl7st/0gth2y c wga )g/5q-dar?

  09.13: In the figure to the right, a box moves wb8*; m-se ucwqith speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the s wmu8*c-e;qb 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 sjn ,6(jfoi4k4naidx3 i z:og;f93o x cpeed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides wio:xofi ;3co z9 ak(i4, j6n gxn4d3ifjth 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 from rest, along a xf2 kkyf: 8u(: l;2uawk m7mbvstraight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car B has traveled the same distance F, what is its spe8ky:k2u:am lwvkb2m7; uf (f xed in terms of B?

  12.07: What is the net force acting on the object duri/ ddpl, 2gv+t h:+tnhzng the time interval of th+n/2 hvtl,d tphgz:+d e acceleration?

  12.08: Through what distance does the object move duriwnl0-en-j* 8ed wp)m gng the time interval of the acceleration8)e*nen -g wj-w0 dmlp

  12.19: The magnitude of the linear momentum of a 4.0weitv-k/jy 6p :r 6yt;0 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 the mass during this t :6/-tpk ew;ryv6 tyjiime interval?

  14.11: A crate gains 36.0 J of kinetiv0(ljl( k5 rp0c 4abfoc energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of thel vl cf4(jb0o(05kr ap following choices best represents the mass of the crate

  94.38: A force F at an angle θ above th7.g mg kzqud.i*0kt k2tqur/4)4j l qte horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocityjkt*.t 4l4u q/zkqur.t g 02gmq)k7id . 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 power output m; -it:bc muf+of 0.10 w to raise a block ver-i: bumm;tc f+tically 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 mnep 5mt/e69hyac 4*l from rest near the surface of the Earth, the gravitational force acting on the 1.00 kg object by the Earth does 10.0 Ja5hpmte6 cl/* 4ymn9e 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 motionless a height ho above a hard floor and rc5 .5 )z8) luqa6tmdorsklxh;eleased. Assuming that the collision with the floor is elastic, which one of the followimsx5)l6.q hukro ) 5 8ctad;lzng 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. The dpopdv0oq26 z0river sees a barrier ahead. If the car takes 95 meters todqp v2o0 06pzo come 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 uniformly until it stops. If6ltq hu:hs 1j: the ball travels 15 meters, what was the average net force applied: hhjs:ul t1q6 while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kinetic eu ftf n 0c0b8(kft5zv2nergies and the three following statements. Which of the abov28n z50fv 0tckt(b uffe 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-xkcscau3; s*qkr8q s:- esc ) with an initial speed of 4.60 m/s. Ignoring air resistance, what is8r xqs;uca-cqcs-kkss) e*:3 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 concrbe / pcgp:p1cu.y(or2ete 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 normal force of contact (N) between the boy’ s feet and the concrete do on tup/pcbpor 2g y(1c.e: he boy?

  02.48: An object of mass M igupu/ illz1 ao902lrb*lw zn/mz :0 v4s 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 the magnitudev4nlo2 iu aw z/z1*bzlgmu lp90/r:0l 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 gr4ri 1.ghncwjah 55q t ey 15ap3rznn2*ound. 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 magnitude of the average net force acting on thei5yn*n hganrajhrw3cz5pe4q . 15t12 mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulleu-sqk w;x . u/l7bk uei5st6e,d sideways until the cord makes an angle t/eubuxsw;7 i5q, k.sl- e6ku
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 slfp x+8xavz - r7rb7jib 1b(t6ned, which started at 7ft j 1zxrvbar7p 8i x6-+b(nb 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?

  06.09: A deliveryman moves 10 cartons 4 g 7dx k4hfn8u/*emidc 5qq8gfrom 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 cartonfux4 8q 7 kmdh5qdcge/g*4n i8s to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is applied(v5wtx9 /2 uln;imrtv 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 choic;trv/x9iml n2twu(5 ves 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 rest frok d.vv0e 2ktw7m the top of a tall tower. Ball A is dropped one second before ball B. After ball B is droppe.twkkev 72 v0dd but before ball A strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws al3 lx ixg: 2z)ge2okj b; 8i(9rjc8uoan 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 3o 2o2b)xg(c; ikj8l 8:a9 irglzjxeuobject 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 2 02c hlifbcsyh;*v 9qconstant of 20 N/m. The potential energy sto20hhsfc; 9icq2 y l*vbred in the spring is:

  97.10: A compressed spring has 16 J of potential en;k4wk0v1otm6cbq kx/ergy. What is the maximum speed it cxw106tc q/km4kkob v ;an impart to a 2.0-kg object ?

  

  10.31: An object of mass M startsb ,5el -xrww)r from rest at the bottom 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? Assume the sa 5-xrlwb,r )weme constant non- zero coefficient of kinetic friction between the incline and the object for both trials.