Define Penumbra ?

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What is Negative Acceleration ?

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What is periodic wave?

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What is Heat ?

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What is time?

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What is the force needed to accelerate a mass of one kilogram one meter per second per second?

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Suppose a car is traveling at 72kmph, and if that car slows down to 60kmph it takes an extra 1 hour to cover that same distance. At 72kmph, how long did it take forthe car to cover that distance?

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If f equals electric force, and q and q (read as: q-prime) are the charges on two particles, the expression f is proportional to q times q prime divided by distancesquared is what law?

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What is ntu in thermodynamics?

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When we go higher up, for how much distance does the temperature roughly decrease by 1oF

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Explain the Mass and Weight ?

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Why is it that the nearer we approach the sun, the colder it becomes ?

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