An electromagnetic wave consists of changing electric and magnetic fields.

Which of the following is an example of matter? (A) materials that make up the stars (B) air (C) metals, gems and minerals (D) all of the above

Are there any scientific proofs of existing UFO? Has anybody seen it?

Star formation begins when

3. Which of the following units is NOT a scalar quantity? A. Temperature B. Acceleration C. Speed D. Mass

What is the purpose of cooking using sunlight?

Ethan pushes a wooden box across a carpet floor then he pushes the same box across a smooth marble floor why does Ethan find it easier to push the box on the marble floor than carpet floor

Let's now apply our equations for the normal modes of open and closed pipes. On a day when the speed of sound is 345 m/s, the fundamental frequency of an open organ pipe is 690 Hz.

Suppose you are an observer standing on the Moon, looking back at Earth. If the moon is in the waxingquarter phase, what phase of the Earth would you see? A. waxing quarter B. full C. new D. waning quarter E. none; the Earth doesn't have phases

How many chromosomes will an elephant's sperm have?

Would the springs inside a bathroom scale be more compressed or less compressed if you weighed yourself in an elevator that was moving upward at constant velocity