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The decibel level of the noise from a jet aircraft is 130 dB when measured 19.8 m from the aircraft. How much sound power would strike the eardrum of an airport worker 19.8 m from the aircraft? (Assume the diameter of the worker's eardrum is 1.7 x 10-2m).
Two particles collide and stick together to form anew particle. First particle has a rest energy Eo and a kinetic energy 2Eo. Second particle is stationary and has a rest energy=2Eo. The question is: what is therest energy and the speed of the new..
A hydraulic lift has pistons with diameters 7.80 cm and 36.2 cm,respectively. what maximum mass can be lifted at the output piston
A toy top with a spool of diameter 5.0 cm has a moment of inertia of 3.0 X 10^5 kgm2 about its rotation axis. To get the top spinning, its string is pulled with a tension of 0.30 N. How long does it take for the top to complete its first five revolut..
a world-class sprinter can burst out of the blocks to essentially top speed of about 11.5 ms in the first 15.0m of the
question two subway stops are separated by 1100 m. if a subway train accelerates at 1.2ms2 from rest through the first
Two 1.50V batteries -- with their positive terminals in the same direction-- are inserted in series into the barrel of a flashlight, What fraction of the chemical energy transformed appears asinternal energy in the batteries
The catapult on an aircraft carrier can take an aircraft from 0 to 209 mph (the launch speed) in 9 seconds, at which time the aircraft launches
You are standing in air and are looking at a flat piece of glass (n = 1.52) on which there is a layer of transparent plastic, Find the smallest possible nonzero value for the thickness of the layer
The solar corona is a very hot atmosphere surrounding the visible surface of the sun. Estimate the number density of particles in the solar corona
A massless rope connects two blocks through a frictionless pulley with a moment of inertia I = 0.4 kgm 2 and a radius R = 0.2 m. Find velocity of the second block just before it hits the ground
A baseball is thrown up from ground level at a speed of 256ft/s: What is the acceleration at the highest point in ft/s2
the drawing shows a square each side of which has a length of l 0.25 m. two different positive charges q1 and q2 are
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