If the density of the universe is greater than critical, then:
A) there is more matter than energy.
B) the universe is closed, gravity wins, and will shrink to the Big Crunch.
C) the universe is flat, and Euclid is right.
D) the Universe will continue expanding forever.
E) the universe will end up as nothing but black holes.
B
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The half-life of cobalt-60 is 5.3 years, while that of strontium-90 is about 29 years
Suppose you have samples of both isotopes, and that they initially contain equal numbers of atoms of these isotopes. How will the activities (number of decays per second) of the samples compare? A) The activities will be equal. B) The activity of the cobalt-60 sample will be greater. C) The activity of the strontium-90 sample will be greater. D) The activities cannot be compared without more information.
In pre-Copernican astronomy, it was almost universally believed that
a. the planets traveled in elliptical orbits about Earth. b. the center of the universe was the Sun with the Milky Way representing other distant planets. c. the Sun was at the center of the universe. d. Earth was at the center of the universe. e. None of the above was believed.
Phase Angles: The phase angle of an RLC series ac circuit with an inductive reactance of 200 ? and a capacitive reactance of 100 ? is 40.0°. What is the resistance of the resistor in this circuit?
A. 100 ? B. 119 ? C. 156 ? D. 200 ? E. 265 ?
Sort each statement below into the appropriate bin based on whether it is something that scientists knew about Pluto or its moon Charon before the New Horizons flyby, is something learned as a result of the New Horizons flyby, or is something that seems possible from the New Horizons mission but for which we'll need additional data to establish it with certainty.
What will be an ideal response?