Climatology is a subspecialty of B) Meteorology.
A : 30 seconds
B: T = 2π Square root of√L/g,
C: how many back-and-forth swings there are in a second, measured in hertz. f = [√(4.9)]/6.28 = 2.21/6.28 = 0.353 Hz.
It is the ratio of distance an object moves to the amount of time needed to travel the distance.
Option b.
The Mandela effect is a good example of time travel