What pressure would a 5000N weight of water exert at the bottom of a reservoir containing it if its length and breadth are 10m and 5m, respectively

Standing waves are produced by 

From the above figure, a uniform meter rule is suspended by two cords from a height. Calculate T?

From the diagram above, the sine of the angle of refraction in glass is 

What happens to the speed of sound in air when the pressure increases at a constant temperature