Air pressure decreases with
A) increasing height.
B) increasing humidity.
C) increasing temperature.
D) increasing density.
Answer: A
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According to what we now know from Newton's laws, which of the following best explains why Kepler's second law is true?
A) A planet's angular momentum must be conserved as it moves around its orbit. B) Orbits must be elliptical in shape. C) Gravity is an inverse cube law. D) This effect happens because of the influence of other planets on a particular planet's orbit.
A track star in the broad jump goes into the jump at 12 m/s and launches himself at 20° above the horizontal. How long is he in the air before returning to Earth?
Since the mass of an object is the same for all observers, it is a relativistically ____________ quantity
Fill in the blank(s) with correct word
How can astronomers currently determine the temperature of an extrasolar planet?
A) estimate the temperature based on the planet's distance from the star B) measure the drop in total infrared light when the planet passes behind the star from our perspective C) use spectroscopy of the planet to identify the wavelength at which its emission peaks D) A and B E) B and C