Why compound pendulam is called an equivalent simple pendulam?

Which graph best represents the relationship between the electric current and the rate at which a magnet is turning inside an electric generator?

Two rigid transformations are used to map δhjk to δlmn. the first is a translation of vertex h to vertex l. what is the second transformation? a reflection across the line containing hk a rotation about point h a reflection across the line containing hj a rotation about point k

Arowboat passenger uses an oar to push the boat off the dock by exerting a force of 40n for 3.0s. what impulse acts on the boat.