How can we be certain that white dwarfs are very small?
What will be an ideal response?
White dwarfs lie in the lower left of the H-R diagram and are lower in luminosity than you would expect, given their high temperatures. That must mean they are very small.
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A(n) _____ is a cluster of galaxy clusters
A) supercluster B) protocluster C) megacluster D) extrasolar cluster
A circumferential cast iron fin attached to a compressor housing is 1 inch thick, 3 in long, 3 in diameter, and the convective heat transfer coefficient is 16 Btu/hr?ft^2? ºF. If the base temperature is 160ºF and the surrounding air is 80ºF, determine the fin efficiency and the heat transfer through the fin.
What will be an ideal response?
The upper mantle can be divided into two portions, the
A) asthenosphere (lower zone of the upper mantle) and part of the lithosphere (the top zone of the upper mantle). B) asthenosphere (top zone of the upper mantle) and the lithosphere (the lower upper mantle). C) Moho and the lithosphere. D) continental mantle and the oceanic mantle.
Wave Characteristics: A radio station broadcasts at a frequency of 80 MHz. How far from the transmitter will this signal travel in 67 ms? (c = 3.0 × 108 m/s)
A. 60 × 106 m B. 67 m C. 40 km D. 80 km E. 20 × 106 m