Which temperature scale must be used in the ideal gas formula?
If the pressure of a gas is held constant, the volume of the gas is directly proportional
to its absolute temperature, so the Kelvin temperature scale must be used.
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How did Harlow Shapley conclude that the Sun was not in the center of the Milky Way Galaxy?
A) by looking at the shape of the "milky band" across the sky B) by mapping the distribution of stars in the galaxy C) by mapping the distribution of globular clusters in the galaxy D) by mapping the distribution of gas clouds in the spiral arms E) by looking at other nearby spiral galaxies
A smooth distribution of radiation across a broad range of wavelengths is referred to as
A) an emission line spectrum B) an absorption line spectrum C) a continuous spectrum D) a broad spectrum
A soccer ball is kicked with a velocity of 25 m/s at an angle of 45° above the horizontal. What is the vertical component of its acceleration as it travels along its trajectory? (Neglect air friction.)
A) g sin(45°) upward B) g downward C) zero D) g cos(45°) downward E) g upward
In an observation made in 1919 demonstrating the deflection of starlight due to gravity, light rays moving near ________ bent to a slightly different angle.
A. a laser with the same frequency of light B. the Earth at its equator C. the Sun D. the Moon