The diagram below shows the oscillation of a simple pendulum.

If the frequency of the oscillation is 4.0 Hz,
what is the time taken for the pendulum bob
to move from Q to R?

A 0.0625 s
B 0.125 s
C 0.250 s
D 0.500 s

What is the order of the moon, earth, and sun in a lunar eclipse and a solar eclipse?

What is the stall speed at sea level of an airplane that weights 10000 lbs., has a wing area of 300ft^2, and a maximum lift coefficient of 1.4? what is the stall speed if flaps that double cl,max are applied?

Samir watches a 100-minute movie on his spaceship. maria's spaceshipe flies in the same direction as samir's spaceship but she observes his move to last 125 minutes and his spaceship to be 40 m long. how long does samir observe his own spaceship to be? according to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does marias voyage take according to samir?