Question1
A ball drops from rest from an unknown height h. The time it takes for the ball to hit the ground is measured to be 2.3 +or - 0.2s. The height is related to this time by the equation h = 1/2 g t^2 where g = 9.81m/s2. Suppose that value for g carries no uncertainty and compute the height h including its uncertainty.
Question2
A cylindrical wire of radius 2.0mm carries a current of 2.5 A. The potential dissimilarity between points on the wire that are 46m apart is 3.7 V.
(a) What is electric field in the wire?
(b) What is resistivity of the material of which the wire is made?