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Physics

Dom Elbon from Nottingham, England asks,

Is gravity lumpy? If you were standing in a valley, then on a mountain, would your weight be less...

the answer

Yes, gravity is "lumpy"-- i.e. the gravitational field of the earth follows...

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Engineering

Jasmin from Brighton asks,

Why are tanks (such as scuba diving tanks, for example) always designed in a cylindrical shape? In...

the answer

The best shape for containing a pressurised gas is a sphere, where by `best'...

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Chemistry

D.D. from St.john's, NL asks,

Ethanol is the focus of many tax dollars these days. It seems to me that the burning of any...

the answer

Whether you burn ethanol or gasoline you of course add CO2 to the...

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Chemistry

max scott from Perris, California asks,

When I go to buy my plain t-shirts, I always wonder if there is a particular color choice...

the answer

 

[Editor: Molecular vibrational energies that are...

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