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Problem 21.19 Two loudspeakers emit sound waves along the x-axis. The sound has maximum intensity when the speakers are 23cm apart. The sound intensity decreases as the distance between the speakers is increased, reaching zero at a separation of 58cm.
Part A What is the wavelength of the sound? Express your answer to two significant figures and include the appropriate units.
Part B If the distance between the speakers continues to increase, at what separation will the sound intensity again be a maximum? Express your answer with the appropriate units.
7400 J of input heat to perform a certain amount of work. Engine 2 has an efficiency of 0.33, How much input heat does the second engine require
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Consider a tungsten filament in a light bulb. After the bulb has been on for an hour, how has the resistance in filament changed (if at all).
A point moves along the x-axis with its position, x, at time t given by x(t) = t3 - 3t2 + 2t - 1. Which of the following is the acceleration when t = 2?
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