4. Two students walk through the grass both have a mass of 60kg, one student is wearing high heels with a surface area of .45 cm and the other is wearing wide heals with a
surface area of .74 cm2. Calculate how much pressure each student applies to the
ground. Why might one student sink into the ground?

Unpolarized light falls on two polarizer sheets whose transmission axes are at right angles. a third polarizer is placed between the first two so that its axis makes a 52-degree angle with the axis of the first polarizer. a) what fraction of the incident light intensity is transmitted through the first polaroid? b) what fraction of the incident light intensity is transmitted through the second polaroid? c) what is the angle of polarization of the light that enters the third polaroid? d) what fraction of the incident light intensity is transmitted through the third polaroid. e) what happens if the middle polaroid is removed?