What do you mean by time period of a wave? If 10 crests and 10 troughs pass through a point in 5 seconds. Calculate its time period and frequency?

Voldy needs hAlp

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

high-sugar diet and high cholesterol

im srry but ur wrong the answer is d a smooth rock, some red dirt, and an empty bird's nest.

snell's law

refractve index = sin incidence / sin refraction