I took a physics class as an undergrad, one of the tests a question was simply: “Calculate the weight of the moon”
Zero.
The mass, however, is another story.
Are you sure your physics question really wasn’t “Calculate the *mass* of the Moon?”
Trying to fathom this real quick.
I’m assuming first that “weight” of the moon actually was “mass” of the moon.
Known mass of the earth.
Known period of orbit of the moon.
Might be able to get it from there...
Might need distance from the earth to the moon...
The moon has no specific weight. Mass and density, yes, but weight is dependent on where you put the moon while you weigh it.
Mass vs. Weight has been pointed out already by many. In a biology class I was once asked to list the causes of old age. I wrote,
“1) Being born early
2) Not dying yet.”
Professor Roos marked me wrong but I argued my way to getting it marked correct. He meant “causes” but I pointed out that a man of science should never confuse cause and effect. He agreed, grudgingly.