I need help with the following questions please. They are short problems.

B1. Sound travels in a tube of length 0.45 m which is open at both ends with velocity 343 m/s. Determine the first two harmonic frequencies of the sound B2. A mass of 0.58 kg is attached to a spring and moves in simple harmonic motion with a period of 2.1 seconds. Determine the spring constant. B3. A wave is described as: y(x, t) = (0.05 m)sin [(16 rad/m)x - (48 rad/s)t]. Calculate the wavelength and the speed of this wave. B4. What is the mass per unit length, u, of a string with a Tension of 240 N while a wave with velocity 15 m/s travels down it? B5. Water, p = 1,000 kg/m', initially flow with p1 = 1.01 x 105 Pa, vi = 2.3 m/s, at y1 = 8 m. Find the new pressure, p2, when it moves to ground level ( yz = 0) and moves with v2 = 6.4 m/s