When relating the linear momentum and total energy of an object with speed v = 0.8c, which of the following changes would increase the energy by the greatest amount? Assume that it is possible to change the mass of the object
D.
This statement doubles the mass of the object, which is squared in both terms of the energy to momentum relation. This answer increases the energy by the greatest amount compared to the other answers, primarily because mass-energy is so great
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O and B stars only occur in the galactic _______________
Fill in the blank(s) with correct word
If an astronaut landed on a planet composed of antimatter, there would be an explosion and the
A) planet would annihilate. B) astronaut would annihilate. C) astronaut and an equal amount of planet antimatter would both annihilate.
Why have studies of the geological record not enabled us to determine how life on Earth originated?
A) the first living organisms would have left absolutely no trace of their existence B) life was planted on the Earth by an advanced civilization so there is no evidence in the geological record to find C) the geological record does not extend back to the time that life originated D) the oldest rocks are too deep inside the Earth for us to retrieve
Which laws of physics, if any, distinguish between the backward and the forward direction in time?
A) None. B) The law of conservation of energy but not the second law of thermodynamics. C) The law of conservation of energy and the second law of thermodynamics. D) The second law of thermodynamics but not the law of conservation of energy. E) Newton's law of motion.