Why are emission nebulae ideal places to go hunting for brown dwarfs?
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These stellar nurseries give birth to a wide range of bodies of different masses, and those of less than 0.08 solar masses will heat up and glow red by gravitational contraction, but never get up to 10 million degrees to reach stage 7 and shine stably on the main sequence. In the Orion Nebula, several such submissive objects are noted.
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What are the Aten asteroids?
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A rectangular steel plate with dimensions of 40.0 cm × 30.0 cm is heated from 14.0°C to 164.0°C. What is its change in area? (Coefficient of linear expansion for steel is 11 × 10^?6/C°.)
a. 8.96 cm2 b. 29.7 cm2 c. 3.96 cm2 d. 1.32 cm2 e. 9.90 cm2
) A golf ball illuminate by only red light casts a colorless shadow. If instead it is also illuminated by a close-by green light source, the non-overlapping shadows will be
A) green and red. B) cyan and magenta. C) white. D) none of the above
Both rolling resistance and drag increase with increasing speed as the square of the speed
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