Which of the following scenarios correctly demonstrates the transformation of mass into energy as given by Einstein's equation, E = mc2?
A) When hydrogen is fused into helium, whether in the Sun or in a nuclear bomb, the mass difference is turned into energy.
B) An object accelerated to a great speed has a lot of kinetic energy.
C) A mass raised to a great height has a lot of gravitational potential energy.
D) When you boil a pot of water, it has a high heat content, or thermal energy.
E) A burning piece of wood produces light and heat, therefore giving off radiative and thermal energy.
Question 2
If we went back in time 10 billion years, would we expect Hubble's constant to be identical to the present-day Hubble constant?
A) Yes, a constant never changes.
B) No, Hubble's constant is roughly equal to 1 divided by the age of the universe, and 10 billion is a substantial enough number to notice a difference.
C) If we went back further in time, it would be different, but 10 billion years is not enough.
D) It would only change if we went 10 billion years into the future.
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