True.
"Magnitude" is usually indicated for individual stars, not for an entire constellation like Eridanus. You could add the magnitude of the 100 or 1000 brightest stars or so, for any constellation (after converting from the magnitude scale, which is logarithmic, to a linear scale), but since this serves no real purpose, this is not something that you find published anywhere.
The two earthquakes occurred due to differing types of fault movement (thrust faulting in the Chilean quake vs strike slip faulting in the Haitian quake) and at two differing types of plate boundaries. In the case of the Chilean earthquake, this was at a convergent boundary where the Nazca oceanic plate is being subducted under the continental South American plate as opposed to the Haitian earthquake which occurred at a transform boundary between the Caribbean and North American plates which are both moving east but at differing speeds. The Haitian earthquake was also of lower magnitude (magnitude 7.0) than the Chilean earthquake (magnitude 8.8) however it caused more damage and led to a much larger number of injuries and fatalities due to the poor construction techniques used in Haiti. Please see the related questions for more information.
Magnitudes of stars start in the negative, so the brightest star from Earth is of course the Sun, so it has an apparent magnitude of -26.74 (Note negative), whereas Polaris (The North Star) has an apparent magnitude of +1.97 See related question for differences between apparent and absolute magnitude.
speed has magnitude. velocity has magnitude and direction.
The measure of energy released by an earthquake depends on its magnitude. If its a high magnitude earthquake, there is a lot of energy. If there is a low magnitude, then there is little energy.
Earthquake magnitude is measured using a number of differing scales including the Richter scale, the moment magnitude scale and the surface magnitude scale. Intensity is measured using he Modified Mercalli intensity scale.
-- When forces of unequal magnitude are added, the magnitude of the sum can be anything between the difference and sum of the individual magnitudes, depending on the angle between them. -- When forces of equal magnitude are added, the magnitude of the sum can be anything between zero and double the individual magnitudes, depending on the angle between them.
Constellations don't have an absolute magnitude. That is a property of individual stars.
We can't answer that without also knowing the magnitude of the individual vectors.
"Apparent magnitude" is the star's brightness after the effects of distance. "Absolute magnitude" is the star's brightness at a standard distance.
Absolute magnitude
No. The largest possible resultant magnitude is the sum of the individual magnitudes.The smallest possible resultant magnitude is the difference of the individual magnitudes.
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absolute magnitude
intrinsic magnitude
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The resultant vector IS the sum of the individual vectors. Its magnitudecan be the sum of their individual magnitudes or less, but not greater.