For a science project, you would like to horizontally suspend an 8.5 by 11 inch

Question

For a science project, you would like to horizontally suspend an 8.5 by 11 inch sheet of black paper in a vertical beam of light whose dimensions exactly match the paper.
If the mass of the sheet is 1.2 g , what light intensity will you need? Express your answer to two significant figures and include the appropriate units. I=?? For a science project, you would like to horizontally suspend an 8.5 by 11 inch sheet of black paper in a vertical beam of light whose dimensions exactly match the paper.
If the mass of the sheet is 1.2 g , what light intensity will you need? Express your answer to two significant figures and include the appropriate units. I=??
If the mass of the sheet is 1.2 g , what light intensity will you need? Express your answer to two significant figures and include the appropriate units. I=?? If the mass of the sheet is 1.2 g , what light intensity will you need? Express your answer to two significant figures and include the appropriate units. I=??

Explanation / Answer

F = m a = 1.2 * 10-3 * 9.8 = 11.76 *10-3 N

A = 6.03 cm2, c = 3.00 * 108

I = F c / A = (11.76 *10-3 * 3.00 * 108) / (6.03)

I = 5.85 * 107 W/m2

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