AP Physics 1mediummcq1 pt
A planet orbiting a star in an ellipse speeds up near the star because
A.angular momentum is conserved
B.its mass decreases
C.the star pulls harder with distance
D.its energy increases
Explanation
Core Concept
L = mvr: smaller r at perihelion forces larger v, with zero external torque.
Correct Answer
Aangular momentum is conserved
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