Some of the standing waves in an organ pipe open at both ends have the following frequencies: 100 hz, 200 hz, 250 hz, and 300 hz. it is also known that there are no standing waves with frequencies between 250 hz and 300 hz.
a/ what is the fundamental frequency of this pipe?
b/ what is the frequency of the third harmonic?

The difference between two numbers is 15. when twice the smaller number is subtracted from three times the larger number, the difference is 58.what is the larger number?

Suppose that two tanks, 1 and 2, each with a large opening at the top, contain different liquids. a small hole is made in the side of each tank at the same depth 1.57 m below the liquid surface, but the hole in tank 2 has 2.49 times the cross-sectional area of the hole in tank 1. (a) what is the ratio ρ1/ρ2 of the densities of the liquids if the mass flow rate is the same for the two holes? (b) what is the ratio rv1/rv2 of the volume flow rates from the two tanks? (c) at one instant, the liquid in tank 1 is 14.9 cm above the hole. if the tanks are to have equal volume flow rates, what height above the hole must the liquid in tank 2 be just then?

Which lists the pairs of plates in order from least to greatest in terms of the work done to move the electron?