A small pan suspended from a helical spring as shown in the figure, empty has an observed period of vibration To. When carrying a known weight P, the observed period of vibration is T and when carrying an unknown weight W (without P), the observed period is T. Find the magnitude of the weight W. (a) (c) T + T 2To T +T T + T P www (b) (d) T+ To P T+To 0 T-T2 T-T2