The Sun is gradually increasing in luminosity as it ages. It is about 30% more luminous than it was when it was born. Why isn't this increase considered to be an explanation for global warming?
A) The Sun is increasing in luminosity way too slowly, over many millions of years.
B) What the Sun was doing millions of years ago is what determines Earth's temperature, since the Earth doesn't respond directly to what the Sun is doing today.
C) The amount of energy the Earth receives from the Sun remains constant regardless of what the Sun does.
D) The scientists are covering up this potentially valid explanation.
A) The Sun is increasing in luminosity way too slowly, over many millions of years.
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How does the strength of Jupiter's magnetic field compare to that of Earth's magnetic field?
A) Jupiter's magnetic field strength is about the same as Earth's. B) Jupiter's magnetic field is about twice as strong as Earth's. C) Jupiter's magnetic field is about 20,000 times as strong as Earth's. D) Jupiter's magnetic field is much weaker than Earth's.
A car moving at a steady 10 m/s on a level highway encounters a bump that has a circular cross-section with a radius of 30 m
The car maintains its speed over the bump. What is the force exerted by the seat of the car on a 60.0-kg passenger when the car is at the top of the bump? A) 200 N B) 390 N C) 790 N D) 490 N E) 590 N
What prevents satellites such as the ISS from falling?
A) gravity B) centripetal force C) centrifugal force D) the absence of air drag E) nothing
Most radio galaxies belong to Hubble's class ________
Fill in the blank(s) with correct word