Recent content by way2go

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    Undergrad Would a Body at the Center of the Earth Have Weight?

    Yeah, OK, I admit. That makes more sense.
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    Undergrad Buoyancy Puzzler - just for fun

    Yes, this explanation is right, I think. Buoyance doesn't apply here, because there is no pressure of the water from below the cylinder.
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    Undergrad The Speed of Light: A Constant Mystery

    This is not true. Recent research by Harvard University has shown that light can be stopped and restarted again! Here's the article: Harvard researchers stop, restart, light Einstein would be surprised Albert Einstein theorized that light cannot travel faster than 186,282 miles per...
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    Undergrad Would a Body at the Center of the Earth Have Weight?

    I think Loren is quite right, but for a body at the center of the Earth r will tend to 0. According F=GmM/r^2 F will tend to infinity no matter what value M has. That's my opinion how the article should be interpreted, although Loren is also quite right.
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    Undergrad Would a Body at the Center of the Earth Have Weight?

    According to Newton's law F=GmM/r^2, a body of mass at a distance r from the center of the Earth (assumed that all mass of the Earth has been concentrated in the center) experiences a weight F. So, as r is very small near the center of the earth, the body will experience a very large weight force F.
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    Undergrad Where Does Earth's Gravity Originate?

    On the other hand, a bit philosophical though, gravity only exists if a body has gravitational potential energy. What's your comment on that? The question might look simple, but too me it isn't.