Nuclear energy is currently used in which three kinds of vehicles? A. cars, submarines, spacecraft
B. submarines, ships, spacecraft
C. spacecraft, airplanes, cars
D. airplanes, submarines, ships

Amplitude is a measure of a waves a; speed b; distance c; energy d; frequency

How does an observation about an object differ from an inference about that object

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