A sphere with a diameter of 0.0095 m and mass of 0.00383 kg is being dropped in water at a temperature of 23 °C.  After taking five samples (???? = 5) the standard deviation of time measurements is ???? = 0.15 s. The average time of the drops was 0.63 seconds and the distance covered in that time was 1 m. 

a) Compute the average Re and ?

b) Derive equations for the uncertainty  and relative uncertainty  if the only uncertainty we account for is precision error in timing. 

c) Tabulate the numerical results for the quantities from part b.