Earth's magnetic field has reversed itself
Indicate whether the statement is true or false
T
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If we found a solar system where the central star's mass was double that of the Sun, what would be the period a planet orbiting 1 AU from the central star?
A) more than a year B) less than a year C) about a year D) impossible to say, since we need to know the mass of the planet to predict its period
Newton's Second Law of Motion tells us that the net force applied to an object equals its
A) mass multiplied by acceleration. B) mass multiplied by energy. C) momentum multiplied by velocity. D) mass multiplied by velocity.
When did scientists first detect gravitational waves from mergers of compact objects (pairs of neutron stars or black holes)?
A) 2015 B) 1543 C) 1990 D) Gravitational waves have not yet been detected, though scientists hope to detect them soon.
Molten rock material beneath Earth's surface is called
a. magma. b. lava. c. silica. d. pluton.