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assume that a loudspeaker broadcasts sound equally in alldirections and produces sound with a level of 109 db at a
a 50-gram ice cube at -30 degrees celcius is heated until 45g hasbecome water at 100 degree celcius and 5g has become
a cylindrical cistern constructed below ground levelis 28 m in diameter and 20m deep and is filled to the brim with a
ball a moving to the east collide with ball b and c which are atrest after collision ball b went northe with speed of 3
youve got light traveling in air that hits the top of awater-filled swimming pool perpendicularly ie the angle of
a 004 kg ball is thrown from the top of a 30 m tall building at anunknown angle above the horizontal the ball attains a
a 10-kg block is set moving with an initial speed of 6 ms on arough horizontal surface if the coefficient of
a mass is suspended from the ceiling of a train car by a 454cm long piece of string a passenger notices that the mass
a horizontal mass-spring system undergoes simple harmonicoscillation no friction the mass on teh spring is 12 kg and
a 075 kg object is suspended by a string from the ceiling of a car while the car travels in a 30 m radius circle at
the distance between two telephone poles is 200 ft a 3 poundbird lands on the phone wire midway between the poles if
a real ammerter has non-zero resistance and so acts like aresistor in a circuit one ammerter has resistance 05omega
a force of 15 n applied to a spring stretches it by 4cm what is the potential energy of the spring in the stretched
a metal rod of length 20 m is moved at 60 ms in a direction perpendicular to its length a 50 m t magnetic field is
a mass of 150kg is attached to a spring with a force constant of 358 nm and undergoes simple harmonic oscillations what
a wheel initially at rest begins rotating because of a constantangular acceleration during a certain interval deltat 16
a satellite of the earth has a mass of 99kg and is at an altitude of 195x106 m assume that u 0 as r goes toinfinitya
each of the three helicopter rotor blades shown in fig 10-67 is520 m long and has a mass of 297 kg the rotor is
the question asks to determine the mechanical energy that is lost as a result of the collision not he kinetic energy
a wheel rotating about a fixed axis through its center has aconstant angular acceleration of 18 rads2 in acertain 50 s
a mountain climber jumps a 29 m widecrevasse by leaping horizontally with a speed of 73 msa if the climbersdirection of
driving along a crowded freeway you noticethat it takes a time t to go from one mile marker to the next when you
1 one object that is believed to be a black hole in our galaxyisa the central star inthe planetary nebula the ring
a baseball is thrown straight upward on the moon with an initial speed of 35 ms calculatea the maximum height reached
a small statue is recovered in an archaeological dig its weight is measured to be 2112 and its volume0176ft3a what is