Why are sunsets and sunrises red?
A) The Sun emits more red light when it's near the horizon.
B) Sunlight must pass through more atmosphere to reach our eyes at those times, so more blue light is scattered away.
C) Sunlight must pass through more atmosphere to reach our eyes at those times, which means it passes through a larger volume of red air molecules.
D) The lower temperatures of morning and evening (compared to midday) make the sky redder in color.
B) Sunlight must pass through more atmosphere to reach our eyes at those times, so more blue light is scattered away.
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The difference between a meteoroid and an asteroid is the object's:
A) size. B) shape. C) composition. D) orbital period. E) location in the solar system.
In addition to revolving around the Sun counterclockwise, most planets also rotate on their axis counterclockwise
Indicate whether the statement is true or false
A charged particle moving perpendicular to a magnetic field has a magnet force on it. But when an observer moves with the particle, so that the particle has a relative velocity of zero with respect to the observer, one would expect there would be no magnetic force. Yet there is still a force. If it is not a magnetic force, then what is the source of this force?
a. It is an electrical force. b. It is due to the ether. c. It is a gravitational force. d. It is something other than any of the above.
A 1.7 kg model airplane is flying north at 12.5 m/s initially - and 25 seconds later is observed heading 30 degrees west of north at 25 m/s. What is the magnitude of the average net force on the airplane during this time interval?
A. 0.85 N B. 0.63 N C. 1.1 N D. 1.5 N