By assuming that atmosphere reduces solar energy at Earth’s surface as 1.0 k W / m 2 the reason that a 1 f t 2 hole in a ceiling that allows sunlight when the Sun is overhead is like having a 100 W bulb in the room.

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Chapter 16, Problem 97RCQ

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By assuming that atmosphere reduces solar energy at Earth’s surface as 1.0 kW/m2 the reason that a 1 ft2 hole in a ceiling that allows sunlight when the Sun is overhead is like having a 100 W bulb in the room.

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If the metal sphere on the Van de Graff has a charge of 0.14 Coulombs and the person has a mass of 62 kg, how much excess charge would the person need in order to levitate at a distance 25 cm from the center of the charged metal sphere? Assume you can treat both the person and the metal sphere as point charges a distance 25 cm from each other

If the metal sphere on the Van de Graff has a charge of 0.14 Coulombs and the person has a mass of 62 kg, how much excess charge would the person need in order to levitate at a distance 25 cm from the center of the charged metal sphere? Assume you can treat both the person and the metal sphere as point charges a distance 25 cm from each other (so that you can use Coulomb's Law to calculate the electrical force).