Why can't the two observers agree on when the lightning bolts hit the poles? (Consider the relationship between distance, time, and speed.)

You've already seen the value of 9.8 in this lesson. what's this value called? what quantity does it represent?

Why is rain likely when warm, moisture-laden air meets cold air? a) the lighter warm air will rise and cool down, causing condensation and rain. b) the cold air moves faster and pushes the warm air away, causing condensation and rain. c) the moisture in the warm air condenses on contact with the cold air, causing rain to fall. d) the cold air mixes with the warm air, reducing its temperature causing moisture to condense.

In addition to gravity, what is the other predominant force that affects the motion of a pendulum?