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    NEED HELP HW ! I really need this, it's due sooN!

    Good clear explanation, Turdferguson. And the reason it's dimensionless is because it's a ratio of two forces -- all the units cancel each other out.
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    Cutest Guy/gal At Physicsforums!

    Ummm I'm confused -- what makes you think women are the only people who can decide if a guy is cute?
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    Some more brain exercises!

    Number 1: By (r+s), do you mean the sum of r and s? If so, a quick counterexample: 25 is divisible by (2+3) but it's not divisible by 2 or by 3.