The Moon's angular diameter in the sky is measured to be 0.5°. From this measurement, one can find the
A) bulk density of the Moon (the average number of kilograms per cubic meter of Moon material) if one knows its distance from Earth.
B) diameter of the Moon in kilometers if one knows the Moon's distance.
C) diameter of the Moon in kilometers even if one has no other information about the Moon.
D) distance to the Moon even if one has no other information about the Moon.

Question

Quizplus · Accepted Answer

The angular diameter and the actual distance to the Moon can be used together to calculate the Moon's physical diameter in kilometers using simple trigonometry. Without knowing the distance, the bulk density cannot be directly determined, nor can the Moon's diameter or distance be accurately calculated without additional information.

The Moon's Angular Diameter in the Sky Is Measured to Be