Please help! The leaves on a metal leaf electroscope repel each other
even though no other objects are near it. With the use of
diagrams, explain what must have happened if no charged
object ever touched the electroscope.

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f

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?

The force it would take to accelerate an 900-kg car at the rate of 6m/s2