The main light gathering device of a refractor telescope is

What three things happen when air is warmed? a) it expands b) it contracts c) it becomes lighter d) it becomes heavier e) it rises f) it sinks

How can speed be described

Which of the following best represent positive self-talk A. "I'm making progress". B. "its just not my day". "I've tried. I just can't do it". D. "nothing ever goes right".

How can you prove the mechanical nature of sound by a simple experiment

If 120 N of force is applied to a crate to move it 15 m, how much work is done? 1,000 J 1,800 J 2,000 J 2,500 J

You hold a metal ring horizontally above a bar magnet standing on its end. You drop the ring and catch it before it reaches the magnet.

What do we call seismic waves that are transmitted along the outside of earth?

Through which type of material does sound tend to travel at the highest speed? A. Sound travels at the same speed in every material B. Solids D. Liquids

How does a low pressure system determine the weather in an area?

Molecules at room temperature move freely. What happens to the molecules when heat is removed until it freezes? Molecules group together Molecules slow down and contract Molecules speed up and expand Molecules move freely