97.01: A force F directed at an angle of θ above the /7cjsb94l cn lhorizontal is used to pull a crate a distance D across 4l / 7nl9jcbcsa level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is m,)cg ak ep4;cvl5z. rcoving toward her with horizontal speed v. While bringing the ball to rest, her5)c ca,;. kze4lvgc pr 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 sheet ofqhl/,2flk, :n7bqe3ate fue()* rzc ,tv3gni wallboard 3 meter above the floor for 4 secondkf,7)z*a /ec, 3tqe litbe(:2nfgh lv n3ur,qs. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizontal su+wb) ,t giyl8prface f)lwbp+ ,8igty or 5.00 s. The block’s kinetic energy strictly 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 bloc8ijnr0dps7f3gtq-w63 j 2ynlk 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 J in this time yf jq8n6j 27 dr3tngsi30p-lw.
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 tjvjx4/ (:lx hfhe right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizonjl/x(hxfj 4v:tal 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 rpi4xd2le fp5 -ight is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides-e5 xp4pd fli2 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 /x2sw sge is0d-jfmf7)0a : ymfrozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves ofaigfe 00/-m jsy2)7x:dfmsw sf 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 it kinetic energy. An hour after the fanq gub01obkb+7 1ey jh2e5bw8p has byhkw5711bgb e8b b qp 2o+uj0eeen 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 a position of 3.0 m, a spe0 2wov/n pk:c, gh,gm 4+mdutued of 4.0 m/s, and an a2tmv h gn+k ,:wm p4c,du0/goucceleration 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 bookro,mt8 ujdvm1gs ar()g0zspgxpy 1k**( om 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. The box has a mass of 10.0gkxmgsum)*g1y*p ( tp(8z1 vdj a,rs0 kg.

  02.32: An automobile engine delivers 24,003no tbk db:;b8sbaf( +0 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant spee+kad8o3 bfn:(; bbts bd 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 bottol f7t 4iif8:fwm 48fwl:if i tf7of 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/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 tonu,7(f7p lv p wcpqx*0 the right, a box moves with speed 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 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 inclinuwxcq0p*n7l ,pv( pf7 e.
How much work is done by the applied force F to the box?

  11.30: Two cars travel to the right, each starting from rhzq + :8xnsec3est, along a straight road. CarA has twice the acceleration of Car B. After traveling a hx c nq+z:38esdistance 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 forhz-(ijq2b5b5 jv50h: n ojdiace acting on the object during the time interval of the accelq i vdj5b- jz255bhai o:j(0nheration?

  12.08: Through what distance does the object move durm ol7igah) 10ming the time interval of the accel7mo 1m0h)iagl eration

  12.19: The magnitude of the linear momentum of a 4.00 kg point;m7e m:t(m02tpklpdw mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 t(pt:l0 ekm;dm pm2w7 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 its speed is i/api.*q1iw 2*mp w2smx5s puvncreased from 2.00m/s to 4.00m/s. Whix2ia2uq5./p *sp * spivwmmw 1ch one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is uxzl n,xi( deo0;-pkbk .3m, ahkt3rh6sed to pull a heavy suitcase of weight mga distance d 3 z(lk x.i 63ma-hkpo0dek ,, hxrt;nbalong a level floor at constant 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 force and delivers a u,* ;zgffj8 ilyt59 vk5tzwo u9seful power output of 0.10 w to raise a block vertically ;wg it59z,zt59f* fyv8 ujlokat 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 d30y7bwc av 4jthe surface of the Earth, the gravitational force acting o074abj3dywvc n 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 object during the fall?

  96.18: A rubber ball is held motionless a height ho above a harwfn5v,e yn0*cd floor and released. Assuming that the 5e,nwf*nvc0y 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 at 28 m/s. The driver sees a69f,q+5j97f jyou5 prbkhjhpq k: n3k barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum aveyhk9j5963b+ u: qh7k,p5 frfjkjnp q orage net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until,ehr g4 du0qan cz71ozf kf7;lqil-,4 it stops. If the ball travels 15 meters, what was the average net force applied while itcql ,hg-0foqan7z,u1zd i lf 4;er4k7 was coming to a stop?

  02.26: Consider two laboratory carts of different mas7 8 lbjg)abnk3p0e mi;yow5y) ses but identical kinetic energies and the three following statements. Whi3ky7)goepbwnaib 58jml0 ; y)ch 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 jrb 7ub - iqs..e jm9*e:7r rdbc:tq-san initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highe*9strji.qe e-7cj:7. -mbb : u bdrrqsst point?

  06.20: A boy jumps from rest straight upward from a flat, s 8o9* p/owr mko(;ixrktationary concrete surface. The boy, of mass M, leaves the concrete surface witrki(; xoop8 o wrkm9*/h 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 from aheig70zrvpod)wd byb z7:c3 0 ;fmdhtH 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 magnitude of the average constant force exerted by the ground on the object while coming tozv dzo0b0 7dd 7fw3:b ;pyc)mr rest?

  12.48: An object of maa-+ohdeqbqd +) q)n;rjb h11zss M 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 ri+1deb+jzh)n) 1oqrd aq; q bh-ses 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 *d7qv6b3soz vco /g ;vbkrz)6 is pulled sideways until the cord makes anc6oz qgv6svb/73)r oz*kdv ;b 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 sln un(vdlvae 9u0h3aa466t6zjed, 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 sli0het(u6nzv69 aa3ln auv 64jd des 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 rdjwhj4yo 2bciu7,g04nl6dtpsa0 t- , amp to a loading dock, which is 1.5 meters above the sidewalk. If e 4s n, d0phcb t0,yw6u4lja o7j-tdig2ach 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 for the 6as c(1yetsgge -f 86r+.0 meter motion of the box upward along the incline. The mass of the block is M=158ye(gs st f1+agr6ec - 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 bowlin ,v9niy,lv 6krg balls 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 dropped but before ball A strikes the ground, how are the mechanical enei, k9ny 6rlv,vrgies of the two balls changing?

  11.28: A person throws an object o 0j:yqcoz i324swr mgk om5p86f 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 straight2:mos8 wi5qkp6g4yr zo0cjm3 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)xjlesv)1 +t7kse8x x6ygq5h that has a spring constant of 20 N/m. The potentia x e1yqgt+657lshj) exkvx s)8l energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. z.c,v af; h1bob+h dg2What is the maximum speed it can impd2b+a;. fcbo1hhz, vg art to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed inc+a4h m3b wlg;lline 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 fol3w gh;l+4bam r the two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.