Kepler's second law of planetary motion states that:
A) a planet moves at its greatest speed when it is closest to the Sun.
B) the more massive a planet is, the more its speed will be.
C) all the planets move around Earth in elliptical orbits.
D) the mass of a planet determines how far the planet is from the Sun.
A
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Force on a Moving Charge: A proton moving with a velocity of 4.0 × 104 m/s along the +y-axis enters a magnetic field of 0.20 T directed towards the -x-axis. What is the magnitude of the magnetic force acting on the proton? (e = 1.60 × 10-19 C)
A. 8.0 × 10-15 N B. 3.9 × 10-15 N C. 2.6 × 10-15 N D. 0 N E. 1.3 × 10-15 N
During the Kelvin-Helmholtz contraction phase, a protostar has a much ________ brightness as compared to the Sun
Fill in the blank(s) with correct word
What are the chemical and physical properties of the solar system that any theory of its origin must explain?
What will be an ideal response?
"Spurs" are probably the result of ____
a. self-sustaining star formation b. spiral density waves c. differential rotation d. the central galactic bar e. the short lifetime of O stars