Recent content by Andrew Buren

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    Undergrad Is It Possible to Reach the Speed of Light with a Spacecraft?

    If not, why?
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    Undergrad Is It Possible to Reach the Speed of Light with a Spacecraft?

    If you had a spaceship travleing at half the speed of light then shot a bulit at half the speed of light again, would the bulit appear to go the speed of light relative to an outside obverver? (All preposed in theory, of cource.)
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    Minty Freshness: Why Does It Feel Cold?

    Why does the mint flavore make your mouth feel cold? I thought it might be chemistry.
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    Answer: What Creature Evolves from No Feet to Four Feet to Two Feet?

    You are thinking of: What walks on four feet in the morning, two at noon, and three in the afternoon.
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    Undergrad Gravitational pull of a black hole

    Thanks
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    Undergrad Gravitational pull of a black hole

    Hi, doesn't the gravity of a black hole remain relatively the same? It should because gravitational attraction depends on mass, which stays the same. And if it does, is it posible for a planet to orbit the BH.? (without light, of course)
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    Graduate Permanent Magnet Hoverboard and base?

    It would be amost immpossible to keep the Board cooled at the right temp.
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    Graduate Permanent Magnet Hoverboard and base?

    If you see the link you will find that you need two parallel magnetic repulsors to keep it level.
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    High School Alternative Cooling: Use Energy to Lose Energy?

    Does't it seam odd that we have to use energy to cause something to loes energy. In a freezer you compress the gas (energy expended) to cool and de compress, so as to cool your fridge. Isn't there a way to cool somthing without useing energy (short of sending it to the antarctic).
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    High School Why do the spokes on a wagon seam to rotate backwards at certin speeds?

    This is another thing that I have trouble figuring out. Why do the spokes on a wagon seam to rotate backwards at certin speeds? Help!
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    Making a Solid Rocket Engine Abroad: What Can I Do?

    I'm in the countery of Kazakhstan. No hobby shops, or chem. departemnts to by this stuff. Do you how I could make a simple oxidizer.
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    Making a Solid Rocket Engine Abroad: What Can I Do?

    What I need is fuel out of very common things. .
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    Mermaid fin vs. conventional flipper

    Yes I do dive. However, could it be posible that you think it less efficient because we are used to the conventional way?
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    Making a Solid Rocket Engine Abroad: What Can I Do?

    I really enjoy building model rockets, however, I moved oversees and can't get premade engins. Nor can I get potassium nitrate or any other common combustable. What can I do to make a small solid rocket engin??
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    Mermaid fin vs. conventional flipper

    This is just something I was thinking about... would it be better to design a scuba flipper that has only one up and one down stoke for every cycle instead of the scissor kick? If so (or not) what would be the advantages and disadvantages?