I am not sure what how to set up this up and am looking for

I am not sure what how to set up this up and am looking for setps on how to complete this problem.

Problem 34.55 Part A For a science project, you would like to horizontally suspend an 8.5 by 11 inch sheet of black paper in a vertic al beam of light whose dimensions exactly match the paper If the mass of the sheet is 1.3 g, what light intensity will you need? Express your answer to two significant figures and include the appropriate units. IValue Units Submit My Answers Give Up

Solution

F = 9.8 * 1.3 * 10-3 = 12.74 * 10^-3 N

A = 8.5 * 11 inch² = 0.0603 m²

c = 3.00* 10⁸

I = F c / A

= 12.74 * 10^-3 * 3.00* 10⁸ / 0.0603

= 6.34 * 10⁷ W/m²