At what stage of evolution do T Tauri stars occur?
A) just as the collapsing cloud becomes luminous
B) when a protostar is on the verge of becoming a main sequence star
C) just prior to the protostar stage
D) just after the planetary nebula is expelled
E) after the star has established itself as a main sequence star
B
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The escape velocity needed for an atom in the atmosphere of a planet to escape thegravitational pull of the planet is smaller if:
a) the radius of the planet is smaller b) the planet is farther from the Sun c) the mass of the atom is larger d) the temperature of the gas in the atmosphere is lower e) the mass of the planet is smaller
What would happen if the fusion rate in the core increased but the core could not expand?
A) The Sun's core would heat and the rate of fusion would increase further. B) The Sun's core would reach a new equilibrium, but at a cooler temperature. C) The Sun's core would reach a new equilibrium, but at a higher temperature. D) The Sun's core would cool and the rate of fusion would decrease.
A battery is used to light two bulbs as shown. What happens to bulb B when bulb A is unscrewed from its socket?
What makes a worldview reductionist?
a. Believing that the universe is getting smaller. b. Believing that the behavior of parts can be explained by the behavior of the complex systems they create. c. Believing that the behavior of complex systems can be explained by the behavior of the small parts that create them. d. Believing that complications can be ignored in analyzing problems. e. Believing that theory of everything that reduces everything to one explanation can be found.