An incompressible fluid with a density of [rho] kg/m³ flows…

An incompressible fluid with a density of [rho] kg/m³ flows through a pipe with uniform radius. Three points along the pipe, A, B and C, are shown in the figure. The fluid speed is 4 m/s at point A and 2 m/s at point B. Given that h1 = [h1] m, and h2 = [h2] m, determine the pressure difference between Point B and Point A, that is pB – pA, in pascals (Pa). Assume the flow is steady and ideal (no viscosity).  

A [L] m long string of a musical instrument has both ends fi…

A [L] m long string of a musical instrument has both ends fixed. When the string resonates, it forms a standing wave. The figure shows a snapshot of the standing wave at t = 0. The resulting sound wave in the surrounding air has a wavelength of [lamda] m. Determine the wave speed in the string (in m/s). The speed of sound wave in air is 340 m/s.