Why are eclipses visible from planet Earth?
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From planet Earth, you can see a phenomenon that is not visible from most planets. It happens that the Sun is 400 times larger than our Moon and, on the average, 390 times farther away, so the Sun and Moon have nearly equal apparent diameters. Thus, the Moon is just about the right size to cover the bright disk of the Sun and cause a solar eclipse. In a solar eclipse, it is the Sun that is being hidden (eclipsed) and the Moon that is "in the way."
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When a switch is closed, completing an LR series circuit, the time needed for the current to reach three-quarters its maximum value is ____ time constants
a. 0.500 b. 0.693 c. 0.725 d. 1.33 e. 1.39
A uniform meter stick is pivoted to rotate about a horizontal axis through the 25-cm mark on the stick. The stick is released from rest in a horizontal position. The moment of inertia of a uniform rod about an axis perpendicular to the rod and through the center of mass of the rod is given by (1/12)ML2 . Determine the magnitude of the initial angular acceleration of the stick
a. 17 rad/s2 b. 13 rad/s2 c. 15 rad/s2 d. 19 rad/s2 e. 23 rad/s2
When a one-megaton nuclear bomb is exploded, approximately 4.0 × 10^15 J of energy is released. How much mass would this represent in a mass-to-energy conversion? (c = 3.00 × 10^8 m/s)
a. 1.333 × 10^6 kg b. 0.044 kg c. 0.444 kg d. 3.600 kg e. 4.0 × 10^3 kg
Web designers sometimes measure type size in pixels, where 24 pixels equal a 10-point font.
Answer the following statement true (T) or false (F)