We get a new and full moon every month. Why don't we get two eclipses every month?
What will be an ideal response?
The Moon's orbit is tilted 5.2 degrees to the Earth's orbit (the ecliptic), and the disks of the Sun and Moon are only about .5 degrees wide. Most months the new and full moon pass too far from the ecliptic for the Earth's and Moon's shadows to make eclipses occur.
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The order of evolutionary stages of a star like the Sun would be Main Sequence, giant, planetary nebula, and finally a(n) ________
Fill in the blank(s) with correct word
Two objects have masses m and 5m, respectively. They both are placed side by side on a frictionless inclined ramp and allowed to slide down from rest without any air resistance. Which one of the following statements about these objects is correct?
A) It takes the lighter object 5 times longer to reach the bottom of the ramp than the heavier. B) It takes the lighter object 10 times longer to reach the bottom of the ramp than the heavier. C) It takes the heavier object 5 times longer to reach the bottom of the ramp than the lighter. D) It takes the heavier object 10 times longer to reach the bottom of the ramp than the lighter. E) The two objects reach the bottom of the ramp at exactly the same time.
Identify a true statement about Sagittarius A*
A) It is a powerful source of gamma rays. B) It is the largest constellation in our sky. C) It is the smallest constellation in our sky. D) It is a supermassive black hole.
Identical point charges (+20 ?C) are placed at the corners of an equilateral triangle with sides of 2.0-m length. How much external energy is required to bring a charge of 45 ?C from infinity to the midpoint of one side of the triangle?
a. 26 J b. 16 J c. 23 J d. 21 J e. 12 J