Two stars both lie on the main sequence. Star X is spectral type A, while Star Y is spectral type G. Star X must be more massive than Star Y
Indicate whether the statement is true or false
TRUE
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Aluminum alloys such as 2024 and 7050 _________ recommended for welding.
Fill in the blank(s) with the appropriate word(s).
Magnifying Glass With the Image at the Near Point of the Eye: A person with a near point of 25 cm uses a magnifying lens having a focal length of 10 cm. What is the angular magnification of this lens if the person's eyes are focused at his near point?
A. 1.5 B. 2.5 C. 3.5 D. 4.5
Why are lunar eclipses more commonly seen than solar eclipses?
A. Lunar eclipses occur at night and are easier to see. B. The Moon goes around the Earth faster than the Earth goes around the Sun. C. The tilt of the Moon's axis is smaller than the Earth's. D. The Earth casts a bigger shadow than the Moon.
Gravitational lensing is the process by which
A) a massive object magnifies and distorts the light from an object behind it B) the wavelengths of light from a star are shifted as it moves about its center of mass C) a planet passes in front of its parent star and blocks part of its light D) a massive object accelerates another object that passes close to it