The third harmonic of an organ pipe that is open at both ends and is 2.25 m long excites the fourth resonant frequency above the fundamental in another organ pipe. Determine the length of the other pipe when A) it is open at both ends and B) when it is open at one end and closed at the other. The temperature is unknown, therefore the speed of sound is unknown.

The heater element of a 120 v toaster is a 5.4 m length of nichrome wire, whose diameter is 0.48 mm. the resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 ω·m. the toaster is operated at a voltage of 120 v. (a) what is the power drawn by the toaster? (b) if the cost of electricity is 12 ¢ per kilowatt-hour, and it takes 2 minutes to toast bread, how much does it cost for toasted bread? (c) when the heater element is at room temperature, is the resistivity in the nichrome wire greater than, less than, or equal to it’s resistivity when at operating temperature? explain.