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Showing posts from March, 2017

How fast are you moving?

       How fast are you moving     If you put this simple question to different people, you would get different answers depending on where they are or what they are doing. " I am running at 20 km/h" " I am on my motorbike at 80Km/h" " My car odometer says I am at 120 Km/h" "Ladies & Gentlemen, this is your captain speaking, We are currently cruising at 800 Km/h at an altitude of 35000 feet." "Houston,  we don't have a problem ,  all ok up here in the International Space station & we are orbiting the Earth at 28000 km/h". Which is the top speed of our satellites. And if I put that to my friend watching TV with me in my living room, "Are you nuts? I am not moving, is your head spinning?" Interestingly each one of them is right & each one of them is wrong.  Speed is relative & always has a seemingly stationary reference point. If there is no reference point then you would not know if you are ...