If you are driving down a highway at 65 mph with your headlights on, the speed of the light emitted from your headlights as seen by a person standing on the side of the road is
a. c.
b. c + 65 mph.
c. slightly greater than c.
d. none of the above.
a
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If one of the intrinsically brightest stars in our sky were 10pc away from Earth, it would appear:
A) more than 10 times as bright as Earth at its brightest. B) more than 25 times as bright as Venus at its brightest. C) more than 10 times as bright as Venus at its brightest. D) more than 25 times as bright as Earth at its brightest.
Mercury's magnetic field is thought to be due to:
A) dynamo action, like the Earth's magnetic field. B) a mechanism entirely unique to Mercury. C) being close to the Sun. D) being a fossil remnant dating back to the distant past when the core was more liquid.
All of the following are scalars, except
A) mass. B) force. C) temperature. D) distance. E) time.
Of all the stars in the Orion Nebula, only three are hot enough to ionize hydrogen
Indicate whether the statement is true or false