Planets Go Around the Sun in Elliptical Orbits

question 12

Multiple Choice

Planets go around the sun in elliptical orbits. The highly exaggerated diagram below shows a portion of such an orbit and the force on the planet at one position along that orbit. The planet is moving to the right. F_|| and are the components of the force parallel (tangential) and perpendicular (normal) to the orbit. The work they do is W_|| and . At the position shown

• A) W_|| slows the planet down; speeds it up.
• B) W_|| slows the planet down; does no work on it.
• C) W_|| speeds the planet up; does no work on it.
• D) W_|| speeds the planet up; slows it down.
• E) W_|| does no work on it; speeds the planet up.

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