Why are penumbral eclipses less obvious than partial eclipses?
What will be an ideal response?
A penumbral lunar eclipse occurs when the Moon passes through the penumbra but misses the umbra entirely. Because the penumbra is a region of partial shadow, the Moon is only partially dimmed. A penumbral eclipse is not very impressive.
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Roughly what percentage of the mass-energy of in-falling matter can be converted to other forms of energy as the matter falls into a black hole?
A) 0.7% B) 1-4% C) 10-40% D) 100%
It is a common misconception that a light-year is a unit of _______________
Fill in the blank(s) with correct word
A lens is made with focal length -40 cm using a material with index of refraction 1.50. A second lens is made with the same geometry as the first but using a higher index material, the index being 2.00
What is the focal length of the second lens? A) -40 cm B) -80 cm C) -53 cm D) -20 cm E) -30 cm
What is the equivalent resistance between points a and b when R = 12 ??
A. 20 ? B. 16 ? C. 24 ? D. 28 ? E. 6.0 ?