According to what we now know from Newton's laws, which of the following best explains why Kepler's second law is true?
A. A planet's angular momentum must be conserved as it moves around its orbit.
B. Orbits must be elliptical in shape.
C. Gravity is an inverse cube law.
D. This effect happens because of the influence of other planets on a particular planet's orbit.
Answer:A
According to what we now know from Newton's laws, which of the following best explains why Kepler's second law is true?
A. A planet's angular momentum must be conserved as it moves around its orbit. B. Orbits must be elliptical in shape. C. Gravity is an inverse cube law. D. This effect happens because of the influence of other planets on a particular planet's orbit.