In a harry potter movie, there is a big pendulum in the great hall that goes back and forth once every 18.9 s. what is the length of the pendulum(if it obeys physics instead of magic)? (unit=m) PLEAS HEL M

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle

answer a fan shaped mass of sediment deposited at the base of a mountain front do to an abrupt change in stream gradient;