Why do elements need to be heated to emit color?

Several paper clips dangle from the north pole of a magnet. The induced pole in the bottom of the lowermost paper clip is a A) north pole. B) south pole. C) north or south pole - no difference really.

The two main currents that affect the united states on the eat coast and west coast

A container is formed by revolving the region bounded by the graph of y=x^2, and the x-axis, 0 < x < 2, about the y-axis.

What type of potential energy does a roller coaster have? Explain

I just discovered a 3.5 msun main-sequence star orbiting a 2.5 msun red giant. i'll bet that red giant was more massive than 3 msun when it was a main-sequence star.

What is the most advanced life form on earth

Which EM wave is about the size of humans?

Describe how the Catapult works?

Newton's third law of motion states that the force pair acting on different objects consist of two forces that

While working on her science fair project Venus connected a battery to a circuit that contained a light bulb. Venus decided to change the light bulb to a higher resistance, but she wanted to keep the current the same.