The most severe mass extinction during the past 500 million years occurred at the end of which geological period?
A) Devonian
B) Triassic
C) Permian
D) Cretaceous
C
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The Doppler Effect is a phenomenon that allows one to measure an object's
A) temperature. B) radius. C) line-of-sight speed. D) chemical composition.
Two objects, a ring and a disk, both with equal mass and radii. Each is rotating about an axis through its center, as shown. Which has the greatest rotational inertia, I, a uniform disk or a ring?
A. They have the same I, since they both have the same mass and radius
B. The disk
C. The ring
Primordial nucleosynthesis implies the Big Bang makes all elements up to iron
Indicate whether the statement is true or false
A string of length 2.5 m is fixed at both ends. When the string vibrates at a frequency of 85 Hz, a standing wave with five loops is formed. (a) Determine the distance between two adjacent nodes
(b) Determine the wavelength of the waves that travel on the string. (c) Determine the speed of traveling waves on this string. (d) Determine the fundamental frequency of this string.