97.01: A force F directedv- di2u(az* vx0j 0jjq at an angle of θ above the horizontal is used to pull a crate avqixa2(0 v-0jz*jj ud 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 mop09-u8n0r ik 0gbs fde/ko x5uving toward her with horizontal sped9f0gbu - nuer5io0 ks/8x p0ked v. While bringing 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 sheet of wallboard 3 met+5hw e6 htqns*er above the floor for*hw5+ethq s6n 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleratio+3 ey:u8ywehv n on a horizontal surhe8ywe: 3+yuv face for 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 +ny2ydhjdc)3block slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic ) dh+y2cn3 yjdenergy 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 kg bwk8jz:apa cz k )4e4zg;a 0ei77xec)rlock for 5.0 s. The block was initially at rest and slides on a)wzxkajzc 4)z kep 7c0:87a;g e r4eia 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 qxg*d7 3brc5i,2nd3pqn+sl j directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initial73nqn*id5,glcr+jb qx3 dsp2 ly 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 restoo3 nrj u-8g4phn a frictionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while tr-pnuj 3g4h8 ohe 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 ith;d 7jtc5- fsz kinetic energy. An hour after the fan has been turned 7 tc hzjfds-;5off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of massn91t9 zh.mnkmd)pj qc, m7 piww0x 9w; 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an accelmwpxi)1nj9zd.kcn wq;9 9h7wp 0,t mmeration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textgpw yg ms48l/;books is on the middle shelf in the bookroom 1.3 m from tgy4sgml8; w p/he 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 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 2il,b3 8l(uj (rmj/bkcg9h m ehorsepower) 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 o,9rl 38i2 kbej/mj((bclhu g mf the retarding force acting on the car?

  09.13: In the figure to the right, a box moves with speed 5.00 ee*a ;d,(fpu) orgoot nc42 e6m/s at the bottom of a rough, fix tc;edga6o pe) 2,(uf* er4ooned 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 to the rwrn2al)5 ey2n ight, 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 = 240e 2)nwr5 a2ynlN. 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 o ::.yy/j( ;rjx,9nfpxxoya b a straight 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 sa nofjo ,y;xp.y9r yj:b:( xa/xme distance F, what is its speed in terms of B?

  12.07: What is the net force acting on the object during tfikl)gvx*dbxqs13l/t;) -w: g4gl bz he time interval of the accelex*q fkgg-v)l /s3dgzwbtil l4:b;) 1 xration?

  12.08: Through what dixe:sl*lev 6,gz0p2 1cfvci p)f0v, bhstance does the object move during the time interval of the accelerationvh0vfg fl cvx2,c0 6bpl, siee)p*: z1

  12.19: The magnitude of the linear momentum ofv( ow8f/ :uc :+vyqavp a 4.00 kg point mass is changed from / :of:wvuv(+ yq cpa8v6.00kg.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 time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speszhyb809s ipum2h/b 9 ed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best repre2 0sb89sy/pmb9iuh hzsents the mass of the crate

  94.38: A force F at an angle θ above the horpitp 9057:ty b pcod (i;er+mfizontal 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 and the suitcase is μ. The work done by the frictional fp t;tpf p7:y(5bc drm+9 e0oiiorce is:

  14.31: A toy crane exerts an upward force and delivers a useful pogei;a74p0 e3t l-t, jg bi1qtd+kt3vkwer output of 0.10 w to raise a block vertically at a constant speed. At what constant spee3ttejgi,vlqb+ -tp k 013;4 agt7kdied will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object ( s.-an2 aztytis released from rest near the surface of the Earth, the gravitational force acting on the 1.00 kg object by the Earthsa t.(2za ty-n 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 c)l423rlgncf a height ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relationship between ther4f3cl)n gcl2 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. T/)ql 7 w9 bd/h-tbfjayhe driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is 7 -/ f )b9hwqjdtab/ylthe magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly unpho7 f8n t04gfrhk4,3tldnqrh19 la 8 til it stops. If the baqr0,3n4rklod t9g4hhp ff8 1tl8na h7ll travels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kinetic eggg2*tdel/ccw 8o6 0energies and the three following statements. Which of the above statements would be coe8l2 cgtc0 d6/gg*eworrect?
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 44ywru.; 3zo7kxg 9gb -otzdnis tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its high r3;-t7gduwo by4.g4zn z kxo9est point?

  06.20: A boy jumps from rest straight upward from a flat, fs-rx xxe51*8 : qtx.q*cgldw stationary concrete 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 lx x-s*r :.e 8dgq xcft*1qx5wof 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 ii6n3 k s a:miofeq2s00s dropped from aheightH above the ground. The object crashes into some soft earth and comes to rest by compressing the earth aq: n 2s3s0m6 fioa0iek 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 ground. The objesiy09/iu cjo:lcs 8f0ct 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 the mass during the collision ws u:98c 00 yl/foiijcsith the surface?

  96.38: A pendulum bob mass mon a cord leoo :i6*m 3,c4n a/j gs9sqcjsnngth L is pulled sideways until the cord makes an angle o q4sjnmcis6/gc9ojsa3n ,*:
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,1hvn bgbc(9 veq)l5 i unknown angle. The sled, which started at thg evv,i1 )cb l(9nh5bqe 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 sidewalkz-nddb13ek os tl )jo.,3,yeh , 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 cartons to move them to the loading dtd)b3n1o js-dzey3klo,.e,h ock?

  12.16: A constant force F=50N (as shown in the figure) is applied for te:2snnv3.sb xhe 6.0 meter motion x 3:.es2vsnnb 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) vu8 fhy9vwnz 54rgn; bowling 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 ar4 g5zfrv ;n)u v8y9nhwe the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upward with an initial bs4 ;pkpoc7 (inon-zero speed v. The object rises to a maximum height H above the launch point. The person now throws an object of mass ikb7;os (4p pc0.5M 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 of 20 N cwgz z8vdza::u;n hg4u-34mr/m. The potv-4zu3zg nuch 4ar :;mdwz8g:ential energy stored in the spring is:

  97.10: A compressed spring has 16 J of pot oes2o3 .vl+z:ga3zs jential energy. What is the maximum speed it can impart to a 2.0-kg objejlzez +33v .s ag:oso2ct ?

  

  10.31: An object of mass M starts from rn2ls hrv8pam d03gkl.(1i( z best 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 same constant non- zero coefficient of kinetic friction between the incline and the object for bot bhslip0l( avrd2g 8m(1.n zk3h trials.