What happens when the wire in an electromagnet is wrapped around a soft iron core?

Which statement best describes who the period and frequency of electromagnetic was change between gamma rays and microwaves? a) the period and frequency stay the same. b) the period increases and the frequency decreases. c) the period decreases and the frequency increases. d) the period increases and the frequency increases.

An inclined plane wrapped around a metal shaft is a a. lever b. screw c. pulley d. wedge

If a stone with an original velocity of 0 is falling from a ledgeand takes 8 seconds to hoybthe ground whays the final velocity of the stone