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Physics

spandan jansari from the Internet asks,

How many satellites orbit the earth? How many are used for weather forecasting? And what is the...

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[Updated October 23, 2006] According to Dr. T. S. Kelso at Read the answer...


Physics

bruce marshall from Davie asks,

In energy transformations, even on the subatomic level, is some energy always lost as thermal...

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At a detailed level, your question invites considerable digression -- you...

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Engineering

Damanjit Singh from New Delhi, India asks,

What will happen if we use petrol in a diesel engine or vice versa?

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Petrol in a diesel engine

[I have inadvertently investigated...

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Physics

Sacha from Charleston asks,

Yesterday I was watching "Hercules" with my little sister and now I wonder: Have the planets ever...

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You've asked a subtle question. The planets don't move like gears in a clock...

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