The moon is 400 times smaller than the Sun, but
400 times closer to Earth than the Sun. What is the
result of this coincidence?

How much heat is added if 0.814g of water increase in temperature by 0.351 degree c?

What prefix multiplier is appropriate for reporting a measurement of 5.57 ×10−5 m?

Acertain atom has 22 protons and 19 electrons. this atom loses an electron. the net charge on the atom is now 4+1+01-4-. if this same atom with 22 protons and 19 electrons were to gain 3 electrons, the net charge on the atom would be 3+2+02-3-.