- #1
Michael Moynihan
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Homework Statement
You want to support a sheet of fireproof paper horizontally, using only a vertical upward beam of light spread uniformly over the sheet. There is no other light on this paper. The sheet measures 20.8 cm by 28.8 cm and has a mass of 1.70 g .
(a) If the paper is black and hence absorbs all the light that hits it, what must be the intensity of the light beam?[/B]
Homework Equations
I=P/A
A=w*h
The Attempt at a Solution
A=0.0599m^2
I do not know power, so I do not know the intensity. What information does saying that the paper absorbs all the light that hits it actually give me?