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Wavelength of 125 meters is moving at a speed of 10 m/s. what is it's frequency?

The brightest star in the night sky in the northern hemisphere is sirius. its distance from earth is estimated to be 8.7 light years. a light year is the distance light travels in one year. light travels at a speed of 3.00 × 108 m/s. calculate the distance from earth to sirius in miles. (1 mi = 5280 ft) g

Relative to the ground below, how many joules of potential energy does a 1000-kg boulder have at the top of a 5-m ledge?