An atomic nucleus has a size of about
A) 10-6 meters. B) 10-15 meters. C) 10-12 meters. D) 10-9 meters.
B
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What is the magnitude of the cross product of a vector of magnitude 2.00 m pointing east and a vector of magnitude 4.00 m pointing 30.0° west of north?
A) 6.93 B) -6.93 C) 4.00 D) -4.00 E) 8.00
What observational properties of pulsars allowed astronomers to discover them as a new type of object?
What will be an ideal response?
What was the first geological period in Earth's history after the dinosaurs became extinct?
A) The Cretaceous Period B) The Carboniferous Period C) The Tertiary Period D) The Triassic Period
What did the cosmic microwave background tell cosmologists about the early universe?
A) Nothing; it is a product of the black hole in the center of our own Galaxy. B) The horizon problem, in that the microwave background is almost too isotropic C) The discovery of dark energy and its role in accelerating the universe D) The discovery of relativistic redshifts and the Big Bang E) The dark matter in the universe is mostly baryonic in nature, for a closed Big Bang.