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A wave of amplitude Ai and wave number ki is incident on the junction of two strings. If the wave number in the second string is kt = 2ki , find the amplitudes of the transmitted and reflected waves. By what fraction is the speed of the wave reduced as it crosses the junction? What fraction of the incident power is transmitted? (Power is proportional to amplitude square but also depends on wavespeed, so it is easiest to compare the power reflected to that of the incident wave, and then find the transmitted power by requiring energy be conserved across the boundary.)
At = (2/3)Ai , Ar = (-1/3)Ai , vt/vi = 1/2, Pt/Pi = 8/9
A defibrillator consists of a 15.3-µF capacitor that is charged to 8.4 kV. What is the average power delivered to the tissues
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One mole of a ideal gas initially at temp To=0C undergoes an expansion at a constant pressure of 1atm to four times it original volume
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An aluminum cup contains 225 g of water and a 40-g copper stirrer, all at 27°C. A 500-g sample of silver at an initial temperature of 85°C is placed in the water. Calculate the mass of the aluminum cup
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