A light ray at an incident angle of 32 degrees is struck onto an unknown substance through air (n=1.0). The
refracted angle is 24 degrees.
a. What is the index of refration for the unknown substance? (use guess method)
b. How fast is the light wave moving through the unknown substance? (use guess method)

Copper has free electrons per cubic meter. a 71.0-cm length of 12-gauge copper wire that is 2.05 mm in diameter carries 4.85 a of current. (a) how much time does it take for an electron to travel the length of the wire? (b) repeat part (a) for 6-gauge copper wire (diameter 4.12 mm) of the same length that carries the same current. (c) generally speaking, how does changing the diameter of a wire that carries a given amount of current affect the drift velocity of the electrons in the wire?

The necleus of an atom is made up of what subatomic particles?

If two students are running down the hall toward each other, trying to get to class, and they have the same mass and acceleration, what will happen when they collide? will their forces cancel out or will each one experience a reaction?