a primary cell has an emf of 1.5V. It gives a current of 3A when short circuited. The internal resistance of cell is:

An object's buoyant force and weight mean the same thing.a. trueb. false

Suppose a wheel with a tire mounted on it is rotating at the constant rate of 2.15 times a second. a tack is stuck in the tire at a distance of 0.373 m from the rotation axis. noting that for every rotation the tack travels one circumference (a) find the tack's tangential speed. (b) what is the tacks radial acceleration?

In a good thermo flask the main cause of heat loss is