Auniform electric field exists in a region between two oppositely charged plates. an electron is released from rest at the surface of the negatively charged plate and strikes the surface of the opposite plate, 1.3 cm away, in a time 7.2 times 10-7 s. what is the magnitude of the electric field?

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 two stars in a certain binary star system move in circular orbits. the first star, alpha, has an orbital speed of 36 km/s. the second star, beta, has an orbital speed of 12 km/s. the orbital period is 137 d. a) what is the mass of the star alpha? b) what is the mass of the star beta?

The radius of an atom is closest in size to a