Re: Why gravitional acceleration is measured in unit/sec�?

Raqueeb Hassan wrote:

Hello there!

I was reading about seti and it's problem regarding doppler shift.
Now, ... sorry to be awkward, I din't get why the unit measured as
something cm or ft/sec� ... why this second as (square), please?

Velocity (a certain 'speed' in a certain direction) is measured in units/second, for example metres per second.

That is, in a certain time, you move by a certain distance.

Acceleration (a change in velocity per unit time) is measured in units/second per second, for example metres/second/second. This is simplified to metres/second^2, or metres * second^-2.

That is, in a certain time, your velocity changes by some increment.

(And SI units are much easier than the antique imperial units. There are no 'fiddle factors' required for the units when making calculations.)

Now for the Dopler shift:

With present theories, a radio (or other electromagnetic) signal transmitted between two objects speeding apart at constant velocity produces a constant frequency shift on that radio signal. If the two objects are ACCELERATING apart from (or towards) each other, then the dopler shift steadily increases causing a continuously increasing frequency shift. This will occur between orbiting objects for example.

Hence, the m/s^2 units (acceleration) for the dopler shift compensation.

Mmmm, a few beers and a physics book/ encyclopaedia might help also!

Good luck,
Martin

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- Martin -
- 53N 1W -
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