Which is brighter in our sky, a star with apparent magnitude 2 or a star with apparent magnitude 7? By how much is the star brighter?
What will be an ideal response?
A star with apparent magnitude 2 is 100 times brighter than a star with apparent magnitude 7. (Five magnitudes indicates a factor-of-100 difference; larger apparent magnitude stars are always fainter.)
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The one object in the solar system suspected of having a semi-liquid on its surface is ____________
Fill in the blank(s) with correct word
Resistance and Resistivity: What is the resistance of 1.0 m of a solid cylindrical metal cable having a diameter of 0.40 inches and a resistivity of 1.68 × 10-8 ? ? m?
A. 0.00012 ? B. 0.00021 ? C. 0.0012 ? D. 0.0021 ?
Explain why the Crab Nebula cannot involve a rapidly rotating white dwarf star
What will be an ideal response?
An archer shoots an arrow. If the action force is the bowstring on the arrow, the reaction is the
A) weight of the arrow. B) air resistance on the bow. C) friction of the ground on the archer's feet. D) grip of the archer's hand on the bow. E) arrow's push on the bowstring.