Which of the following is not a major idea of Einstein's general theory of relativity?
A) Time runs slower near strong gravitational fields.
B) It is possible to travel through wormholes.
C) Our universe can have no center or boundaries, yet be finite.
D) Black holes can exist in spacetime, and falling into a black hole means leaving the observable universe.
B
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The Oort Cloud is believed to have been formed by
A) planetesimals that were flung far from the Sun in gravitational encounters with the jovian planets. B) icy bodies formed between stars that have been captured by our solar system's gravity. C) moons that escaped from the jovian planets. D) debris from an icy planet that broke apart early in the solar system's history. E) debris from impacts of planetesimals, asteroids and comets with the jovian planets.
Wind blows at 50 m/s around a 5 cm diameter electric power line when the air temperature is -10ºC. Estimate the heat loss of the power line per unit length if the surface temperature of the power line is 5ºC.
What will be an ideal response?
The central core inside an atom is the neutron
Indicate whether the statement is true or false
Regarding the question of the precise time at which a radioactive nucleus will decay:
A) The time is completely unpredictable (i.e., we cannot know anything about it), because we cannot know anything about an object as small as an individual nucleus. B) The time is only statistically predictable, because our measuring instruments are not yet sufficiently precise. C) The time is precisely predictable for any particular isotope, regardless our knowledge of its precise state. D) The time is only statistically predictable, because of unavoidable uncertainties associated with quantum theory. E) The time is precisely predictable, provided we have sufficient information about the condition of the nucleus.