Uranus and neptune are sometimes called "ice giants" because they contain large amounts of which substances? select all that apply?
a) water b) oxygen c) methane d) ammonia e) carbon dioxide

Why do electron microscopes have higher resolving power than light microscopes?

The charge on an electron is 1.60218 × 10−19 c and its mass is 9.10939 × 10−31 kg. how strong a magnetic field must be experienced by the electron if its path is a circle of radius 5.5 cm? answer in units of t.

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled? a. the field does not change b. the field strength decreases by half. c. the field strength doubles d. the field strength quadruples