Descomposition is a physical changes

What is the atomic mass of an element?

The spectrum of Star A has an absorption line of hydrogen at 660.0 nm. The spectrum of Star B has an absorption line at 666 nm. The wavelength of this transition in the laboratory is 656.2 nm. What can I say about Star A and B?

What do I due about strict teachers

When one ball is raised, it acquires potential energy which is then transformed into kinetic energy once the ball is released. In theory, the total energy should be conserved such that the balls continue in perpetual motion.

Earth exerts a gravitational force on the moon. why doesn't the force of gravity pull the moon into the earth?

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.