State the two laws of equilibrium
An object is in equilibrium when (1) the sum of all forces acting on the object is zero
and (2) the sum of all torques acting on the object is zero.
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Measured ages of globular clusters suggests that the Universe is about
a. 1.4 billion years old. b. 14 billion years old. c. 140 billion years old.
The allowed shapes for orbits under the force of gravity are ___________________________.
What will be an ideal response?
Protostars start off more luminous than the main sequence stars they become
Indicate whether the statement is true or false
A star is seen to have two transiting planets. Planet 1 transits every 3 months, and Planet 2 transits every 15 months. What can we infer about their orbits?
A) Planet 2's semimajor axis is larger than Planet 1's. B) Planet 1's orbit is more eccentric than Planet 2's. C) Planet 2's orbit is more eccentric than Planet 1's. D) Planet 1's semimajor axis is larger than Planet 2's.