Convert 10ergs of into Joule​

Because light travels in a straight line and casts a shadow, isaac newton hypothesized that light is

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?

Aplane flying horizontally at an altitude of 1 mile and a speed of of 500mih passes directly over a radar station. find the rate at which the distance from the plane to the station is increasing when it is 2mi away from the station.