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day04potenergysht

# day04potenergysht - m at perihelion(closest approach to...

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Gravitation Potential Energy Problem Sheet 1. With what initial velocity must an object be projected vertically upward from the surface of the Earth, in order to rise to a height equal to the Earth’s radius. (Neglect air resistance and the rotation of the Earth) (7.9 x 10 3 m/s) 2. Calculate the change in gravitational potential energy for a 1.0 kg mass lifted 100. km above the Earth’s surface. (1.0 x 10 6 J) 3. The distance from the sun to the Earth varies from 1.47 x 10 11
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Unformatted text preview: m at perihelion (closest approach), to 1.52 x 10 11 m at aphelion (farthest distance away). The sun’s mass is 1.99 x 10 30 kg, the Earth’s mass is 5.98 x 10 24 kg. a) What is the maximum change in the Earth’s gravitational potential energy during one orbit of the sun? (1.8 x 10 32 J) b) At what point in its orbit is the Earth moving its fastest, and what is its maximum change in kinetic energy? (perihelion, 1.8 x 10 32 J) A:\sph4u1\chap6\day04potenergysht.doc...
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