Atransformer is to be used to step down voltage from an alternating current source from 220v to 110v. if the primary has 120 turns, then the number of turns in the secondary is.

Gam radio signals can usually be heard behind a hill, but fm often cannot. that is, am signals bend more than fm. explain. (radio signals, as we shall see, are carried by electromagnetic waves whose wavelength for am is typically 200 to 600 m and for fm about 3 m.)

Molten iron fills a mould, which has a volume of 200 cm cubed. calculate the volume when the iron cools and solidifies.

Ascientific blank must be testable and capable of being proven false?