The distance between two successive maxima of a certain transverse wave is 1.56 m. Suppose a maximum passes some point at t = 0, and eight more crests, or maxima, pass that given point along the direction of travel in the next 15.8 s. Calculate the wave speed. Answer in units of m/s.

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