HelpMeWithPhysics

Find the period for the following situations: a) a soccer team scores 3 goals in 90 minutes b) a pendulum swings 30 times in 20 seconds c) a jackhammer strikes the ground 200 times in one minute

A violin string is 33cm long. The thinnest string on the violin is tuned to vibrate at a frequency of 659Hz. (a) What is the wave velocity in the string? (b) If you place your finger on the string so that its length is shortened to 28cm, what is the frequ...

I asked to figure the Period out of those numbers. :P