Calcular la frecuencia de una onda cuyo periodo es 0.025 s

Anybody wanna ? (picture included? )

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

Question part points submissions used suppose that 2 j of work is needed to stretch a spring from its natural length of 26 cm to a length of 36 cm. (a) how much work is needed to stretch the spring from 28 cm to 32 cm? (round your answer to two decimal places.)