Planets Go Around the Sun in Elliptical Orbits $\mathrm { F } _ { \perp }$

question 40

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 $\mathrm { F } _ { \perp }$ are the components of the force parallel (tangential) and perpendicular (normal) to the orbit.The work they do is W_|| and $W _ { \perp }$ .At the position shown

• A)W_|| slows the planet down; \(W _ { \perp }\) speeds it up.
• B)W_|| slows the planet down; \(W _ { \perp }\) does no work on it.
• C)W_|| speeds the planet up; \(W _ { \perp }\) does no work on it.
• D)W_|| speeds the planet up; \(W _ { \perp }\) slows it down.
• E)W_|| does no work on it; \(W _ { \perp }\) speeds the planet up.

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