Why is velocity proportial to pressure?​

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?

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?

The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?