How do you find mass of an object?

Question

How do you find the mass of an object when you only have it's density and length? I know that density is mass/volume. But' I can't figure out a way to get the volume with only the length. Please help! The question is a piece of rope has a density of 6.1g/cm. What is the mass of 10.7 cm of the wire? Answer needs to be in grams.

Answer 1

This is actually a lot simpler than you realize. To get the answer you just multiply 6.1 x 10.7, which equals 65.27.

Why is this? because 6.1g/cm isn't actually the density of the rope, it's just telling you what the total mass is for every cm of rope you have. The rope could be very thin, in which case it's dense, or it could be very thick, in which case it's not dense. You don't know, and you don't need to know. You just know that every cm of this rope weighs 6.1 grams, and you have 10.7 of those, so all you need to do is multiply those two numbers.

Answer 2

i admire Eugene and divas' solutions. Newton says stuff with mass will shop transferring in a at as quickly as line if no different stress acts on it. Einstein says sure, it truly is positive, yet at as quickly as traces are no longer at as quickly as in curved area. Mass (gravity) curves area, and intensely heavy issues like black holes curve it good right into a element. So mild follows "at as quickly as" traces, which lead into the black hollow. additionally, mild purely has 0 mass whilst it incredibly is at relax. considering mild is not at all at relax, yet is often charging approximately, it not at all has 0 mass. The mass it has whilst it incredibly is in action is "relativistic mass". between the methods of measuring the intensity of a laser beam is to adhere a plate in the way of the beam and diploma the stress you get from all those heavy photons whacking into it. Sorry, it became uninteresting. yet you're nonetheless the doppest...

Answer 3

It looks like they're negating the cross-sectional area, so 10.7 g/cm x 6.1 cm = ? g