Author Question: How fast do tectonic plates move on Earth? A) quite fast, but only during earthquakes B) a few ... (Read 71 times)

bobthebuilder · **on:** Jul 27, 2018

How fast do tectonic plates move on Earth?

A) quite fast, but only during earthquakes
B) a few centimeters per century
C) a few centimeters per year
D) a few kilometers per century
E) about 1 mile per hour

Question 2

A planet is orbiting a star. Which of the following statements is true for the acceleration and gravitational forces experienced by the star and the planet?

A) The acceleration of the planet is much more than the acceleration of the star, but the force on the star is the same but opposite the force on the planet.
B) The acceleration of the planet is much more than the acceleration of the star, and the force on the planet is much more than the force on the star.
C) The force on the star is much smaller than the force on the planet, but the accelerations are about equal.