The systems of the Earth have both internal and external sources of energy. Which of the following are internal sources of Earth's energy?
I. fusion reactions between hydrogen atoms in Earth's core
II. the decay of Earth's radioactive isotopes
III. the gravitational energy from Earth's original formation
IV. heat that is generated when water molecules spontaneously split in Earth's oceans
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Ответ:
v = d/t
The requirement here is to get the distance.
d = v*t
d = (3 × 10^8) * 500 = 1.5 × 10^11 meters