Aball rolls around a circular track with an angular velocity of 4π rad/s. what is the period of the motion

Any color picture tube and electric field exerts a net force of magnitude 1.68x 10^-13 n on an electron the rest mass of an electron is 9.11 x 10^-13 what is the electron acceleration?

Describe the function of the endomembrane system? what organelles are involved?

If a tank filled with water contains a block and the height of the water above point a within the block is 0.8 meter, what is the pressure at point a?