It is bright everywhere. You have been able to travel around, and it's clear that you are not inside a star. Yet your surroundings seem as bright as looking directly at the Sun
As you travel around, you notice that you cannot find a single neutral atom anywhere, nor can you find any nucleus besides those of hydrogen and helium. While it is hot (a few thousand degrees Kelvin), it is nowhere near the temperature needed for nuclear fusion. Where are you?
A) You are in the planetary nebula that the Sun will form about 5 billion years from now.
B) You are in an accretion disk around a supermassive black hole.
C) You are in the universe more than 10100 years in the future.
D) You are in the universe during its first 380,000 years.
E) You are in the central regions of a quasar.
D
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A car moves 4 times as fast as another identical car. Compared with the slower car, the faster car has
A) 4 times the kinetic energy. B) 8 times the kinetic energy. C) 12 times the kinetic energy. D) 16 times the kinetic energy.
Volcanic heat comes from
A. radioactive explosions B. the weight of rock C. accumulated sunlight D. fusion deep in the Earth
Where did the Apollo 11 lunar module land and sample?
a. Taurus–Littrow region b. Taurus–Littrow region c. Mare Tranquillitatis d. Hadley Rille e. Descartes region
A ray of light traveling in air strikes the surface of a certain plastic slab at 63.0° with respect to the normal in air. It travels in the plastic slab at a 30.6° angle with respect to the normal. Find the critical angle for the plastic in air
What will be an ideal response?