Suppose you squeeze a sponge into a small ball. does the mass of the sponge change? does it's density change?

Unpolarized light of intensity so passes through two sheets of polarizing material whose transmission axes make an angle of 60∘ with each other as shown in the figure. what is the intensity of the transmitted beam, st?

Idon’t quite understand this problem

If a simple machine reduces the strength of a force, what must be increased?