The Earth's atmosphere is kept close to Earth by gravity. Just as the Earth's gravity keeps you firmly on the ground, it also acts on the gases of the Earth's atmosphere, holding it in place and allowing us to breathe.
A: The charge of a proton is positive, a neutron is neutral and an electron is negative. The protons and neutrons are found in the nucules while the electrons orbit the nucules in their given energy levels.
Answer:
49 kg is the mass of the couch.
Explanation:
GPE = mgh
9800 = m * 10 * 20
9800 = 200m
m = (9800/20) = 49 m
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The answer is B. The nuclei of elements.
