Question

A granite block is at rest on a horizontal surface in a vacuum chamber. The granite block is 3 cm tall, and the length and width are both 20 cm. The density of granite is 2.75 g/cm^3. What pressure does the block exert on the surface?

Answer 1

Answer:

M = V ρ = .03 * .2*2 cm^3 * 2.75 g / cm^3 = .0033 kg     weight

W = m g = .0033 kg * 9.80 m / s^2 = .032 N

P = F / A = W / A = .032 N / .2^2 m^2 = .80 N/m^2 = .80 Pascal