Kepler's second law implies that
a. a planet should move at its greatest speed when it is closest to the sun.
b. the most massive planets will have the greatest speed in their orbits.
c. the speed of a planet in its orbit depends on the size of the epicycle.
d. the mass of the planet determines how far the planet is from the sun.
e. the deferent and the epicycle have to be attached to the sun and not Earth.
A
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a. theory b. paradigm c. hypothesis d. natural law e. model
A free electron and a free proton are released in identical electric fields. (i) How do the magnitudes of the electric force exerted on the two particles compare?
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