Tectonic plates are composed of the
A) crust and mantle.
B) lithosphere.
C) lithosphere and the asthenosphere.
D) crust.
Answer: B
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Dark matter is ___
a. a cloud of black holes and brown dwarfs in the galactic halo b. extremely cold, supermassive molecular clouds in the disk c. an unknown type of mass that does not emit or absorb photons d. the substance of which black holes are made e. a theory to explain galactic formation that has been proven wrong
A spacecraft is measured by an observer on the ground to have a length of 53 m as it flies toward the earth with a speed 1.7 × 108 m/s
The spacecraft then lands and its length is again measured by the observer on the ground, this time while the spacecraft is at rest on the launchpad. What result does he now get for the length? (c = 3.00 × 108 m/s)
In the hydrogen molecule, H2, the separation between the protons is 10?10 m. If the molecule is in its first rotational energy state, what is the angular velocity of the molecule about its center of mass?
How are the circumference, C, of the ground-state orbit of the electron in hydrogen and the de Broglie wavelength, +, related?
a. 
b. 
c. 
d. 
e. 