Which terrestrial planet(s) have magnetic fields?
A) Earth and Venus
B) Earth only
C) all of them do
D) Earth and Mercury
D
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How do we know how old the Sun is?
A) from radiometric dating of solar system meteorites B) from Newton's version of Kepler's third law and the orbits of the planets C) from calculating its fuel supply and how fast it is using it up D) from its speed and distance from us E) from radiometric dating of particles in the solar wind
Why do astronomers suspect 'Oumuamua is not from our solar system?
A. It came from the direction of the constellation Lyra. B. Its composition is too different from the Sun's. C. Its shape is too elongated compared to asteroids in the solar system. D. It is moving too fast to be in orbit around the Sun.
The period of a pendulum is the time it takes the pendulum to swing back and forth once
If the only dimensional quantities that the period depends on are the acceleration of gravity, g, and the length of the pendulum, L, what combination of g and L must the period be proportional to? Acceleration has dimensions of [L][T-2]. A) g/L B) gL2 C) gL D) E)
When a body moves in circular motion at constant speed, the velocity and acceleration point __________
Fill in the blank(s) with correct word