Atrain travels 53 kilometers in 2 hours, and then 54 kilometers in 4 hours. what is its average speed? your answer units

When a light bulb shines, it gives off light energy and energy. a. heat b. potential c. chemical d. electrical

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?

Properties seen when one one substance changes to another are known as properties