Where do earthquakes come from?

2 cycleists, 90 miles apart starting riding toward each other at some times one cycles twice as fast as the other if they meet 2 hrs later at what average speed is each cyclist traveling

Prove that an electron cannot exist in the nucleus

List 3 constants in the lab

Which of the following is true about natural selection? A.) It occurs extremely rapidly B.) It can always be observed within a single generation C.) It causes mutations to occur D.) It causes more useful traits to be passed to offspring

Rays of light strike a bumpy road and are reflected. What can be predicted about the reflected rays? They will not follow the law of reflection. Each will reflect at the exact same angle of reflection. They will all travel in the same direction.

Explain how newton's first law of motion can be considered to be a consequence of newton's second law.

Propose a hypothesis for how the position of the ball will affect the amount of its gravitational pull energy

A water-skier is pulled behind a boat by a rope that is at an angle of 13° and has a tension of 490 N. The water-skier has a mass of 49 kg. Draw a free-body diagram showing the forces acting on the skier. (She is being pulled to the right.)

The transfer of heat by the movement of a fluid is called

Robotic spacecraft have different levels of complexity, which contributes to overall cost. Which of the following types of missions are likely to be the cheapest?