11. The Moon lacks an atmosphere. Of the following statements, which is correct?
(1) Air pressure would still exist since
the Moon has gravity.
(2) Air pressure would still exist since the
Earth's atmosphere extends to the Moon.
(3) Air pressure would not exist on the
Moon.
(4) Air pressure on the Moon equals
the Earth's air pressure.

How is the gravitational force related to the distance between two objects?

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?

Imagine that someone pushes one marble toward a motionless marble. would there still be action-reaction forces involved in the collision? how might the marbles’ motions be changed? ?