Which of the following is most useful to determine how much energy is being used by a circuit in a given amount of time?
a. power
b. current
c. voltage
d. resistance

Fill in the blank. the number of each type of element in the compound (other than 1) is represented by a small number to the right of the element symbol.

Which statement is true? a. kepler's laws apply only to the motion of earth. b. kepler's laws can be used to predict eclipses. c. kepler's laws are true for a central force that is directly proportional to distance. d. kepler's laws can be deduced from newton's laws of motion and gravity.

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f