A square raft with edge length L = 2.4 m floats on a pond. You step on the raft, then dive off, and it oscillates up and down in simple harmonic motion at a frequency of f = 0.65 Hz. Enter an expression for the mass of the raft in terms of L, g, ρ, f, and π.

Avertical clean glass piezometer tube has an inside diameter of d = 1 mm and is used to measure pressure in a horizontal pipe carrying water as shown. due to pressure in the pipe, the water at 20c rises into the tube to a height h. if the water pressure in the pipe is p = 500 pa gauge, estimate the height h: (a) without considering surface tension (b) with surface tension (capillary) effects. the contact angle  can be assumed at 30 deg