Calculate the magnetic field in the electron tube corresponding to a) the smallest current, and b) the largest current in the helmholtz coils. how do these values compare in magnitude with the earth’s magnetic field (approximately 5*10^-5 tesla)?

The velocity of car is 80.0 miles per hour. what is the velocity of car in meters per second? (1 km -0.621 miles) m/s

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?

If the new moon happens on january 15th, what shape will it be on february 6th?