At each corner of a square of side l there are point charges of magnitude Q, 2Q, 3Q, and 4Q. What is the magnitude and direction of the force on the charge of 2Q?

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?

Which planet do you think would be easiest for humans to colonize some day?

Contains chemical energy. a. heat b. light c. natural gas