Why is a cathode ray tube connected to a vacuum pump?

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.

How to tell if a molecule is polar or nonpolar with electronegativity

Asmall 12.00g plastic ball is suspended by a string in a uniform, horizontal electric field with a magnitude of 10^3 n/c. if the ball is in equilibrium when the string makes a 30 ° angle with the vertical, what is the net charge on the ball?