A square iron plate of side has a circular hole of diameter drilled through its centre
PHYSICS · Subjective · A Level · Physics · Further mechanics and thermal physics · Further mechanics and thermal physics
Problem
A square iron plate of side 0.50m has a circular hole of diameter 10cm drilled through its centre. The plate is initially at 10∘C. Its coefficient of linear expansion is α=1.2×10−5K−1. The plate is heated uniformly to 210∘C.
(a) Calculate the change in area of the square plate (ignoring the hole).
(b) Determine the change in area of the circular hole.
(c) Hence find the final area of the hole as well as the net area of metal in the plate after heating.