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    Absorbtion of microwaves in water

    Hi, basically i have a piece of coursework in which a potato is being heated in a convention oven and also a microwave, I've got to model the system using finite difference heat transfer equations. I've done all that fine, the only thing I can't get is the heat generation in a microwave. Now...
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    A space centrifuge...

    I was thinking the other day about how feasable a spinning disc (like in Halo...) or torus would actually be. I'm talking about a relatively small scale one, less than 100 meters in diameter, anything bigger would be quite weighty and very difficult to build. After thinking for a while, i...
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    Space Elevators

    For those of you that don't know, a space elevator is a way of getting into orbit by climbing a huge, ultra stong cable that's teathered to earth, the other end floating in space, the spin of the earth would mean that the cable would straighten and support itself. I've read a few estimates of...