An object spins around its axis with a constant velocity and completes 8 full cycles in 2 seconds, what is the angular velocity

Balloon a has charge q, and identical mass balloon b has charge 10q. you hang them from threads near each other. choose all of the statements with which you agree. check all that apply. a. a and b exert the same magnitude forces on each other. b. the force that a exerts on b is 10 times the force that b exerts on a. c. the angle between the thread supporting a and the vertical is < the angle between the thread supporting b and the vertical. d. the force that a exerts on b is 1/10 the force that b exerts on a.

What was the first instrument to ever record an earthquake?

Acoil suspended freely, points in some direction when no current is passed through it . can you tell what will happen when a current is passed though it?