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It has been suggested that US military tests of a powerful form of sonar (SURTASS-LFA) was responsible for the deaths of quite a few whales some years ago. This device produces under water sound waves with a logarithmic intensity (loudness) of ~235 dB as measured at 1 m from the source. If they turned down the intensity so that the new loudness is 180 dB, what would be the amplitude of the pressure wave at 1000 m from the source?
The current in a coil changes from 3.7 Amp to 2.2 Amp in 0.51 second. If the average emf induced in the coil is14 mV, evaluate what is the self-inductance of the coil
Bill can throw a ball vertically at a speed 1.2 times faster than Joe can. How many times higher will Bill's ball go than Joe's
A weightless spring of force constant 2.50 N/cm is 15.0 cm long when nothing is attached to it. It is now utilized to pull horizontally on a 12.5 kg box on a smooth horizontal floor. You observe that the box starts from rest and moves 96.0 cm through..
A 200 ohm resistor is rated at 1/4 W. What is the maximum voltage that should be applied across it
Light of wavelength 480 nm in air falls ontwo slits 6 * 10^-2 mm apart. How far apart are the fringes on the screen
Upon being struck by 240 nm photons, a material ejects electrons with a maximum kinetic energy of 1.44 eV. Estimate the work function of this material
A gymnast with mass m1 = 47 kg is on a balance beam that sits on (but is not attached to) two supports. The beam has a mass m2 = 118 kg and length L = 5 m. Each support is 1/3 of the way from each end. Initially the gymnast stands at the left end ..
A long vertical wire carries an unknown current. Coaxial with the wire is a long, thin, cylindrical conducting surface that carries a current of 31.7 mA upward, what is the current (in A) in the wire
There are three masses m1 = 2.0 kg, m2 = 5.0 kg and m3 = 7.0 kg. The mass are all affixed to a massless rod of length 15cm. m1, Calculate the center of mass of the system
q1. a student calculates the frequency of a waveform produced through a tuning fork to be 303 hz. if the tuning fork is
The equation of a transverse wave traveling in a string is given by y=a sin(k x??t). the tension in the string is 20.0 n, a = 2 mm, k = 30 rad/m, ? = 850 rad/s. what is the wave speed? What is the linear density of the string?
Mercury flows through a horizontal pipe 1.40 cm in diameter and 0.6 m long. what is the rate of flow through the tube
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