At midday, solar energy strikes the earth with an intensity of about 1 kW/m2 . What is the area of a solar collector that could collect 150 MJ of energy in 1 hour

A = 41.67 m²

Explanation:

The intensity is defined as power received per unit surface, as follows:

       

By definition, power is just the rate of change of energy with time, so we can write the following equation:

       

From the givens, we know the following:ΔE = 150 MJΔt = 1 hour = 3600 sec.

⇒    

Replacing (3) in (1), and solving for A, we get:A = 41.67 m² , which is the area of a solar collector that could collect 150MJ of energy in 1 hour, as needed.