The figure shows an elliptical orbit of a planet around the Sun S. The shaded area SCD is twice the shaded area SAB. If t₁ is the time to move from C to D and t₂ is the time to move from A to B, then:

Question

G1 Physics · Accepted Answer

Step 1: Kepler’s second law states that a line joining planet and Sun sweeps equal areas in equal time. Step 2: Since the swept area SCD is twice SAB, the corresponding travel times satisfy t₁/t₂=2. Final answer: C — t₁ = 2t₂.