Why would the earth's orbit be unaffected were the Sun to suddenly become a black hole?
What will be an ideal response?
The earth's orbit (and those of the other planets) would remain unchanged since they are far enough away that Newton's law of gravity applies and the gravitational force depends only on the masses of the objects and the distance between them, not on their composition or density.
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Coronal gas radiates energy at ______________ wavelengths
Fill in the blank(s) with correct word
Say that our Moon was Full on May 1, 2007. When was the next First Quarter phaseafter that Full Moon?
a) May 15 b) June 1 c) May 22 d) May 8 e) May 4
Most of the key energy-generating chemical reactions used by life on Earth are
A) rearrangement reactions B) redox reactions C) decomposition reactions D) combination reactions
A baseball catcher puts on an exhibition by catching a 0.175-kg ball dropped from a helicopter at a height of 89.0 m. What is the speed of the ball just before it hits the catcher's glove 1.00 m above the ground? (g = 9.80 m/s2 and ignore air resistance)
a. 41.5 m/s b. 0.482 m/s c. 1 730 m/s d. 29.4 m/s e. 42.0 m/s