1 Steel shingle metal roof: Installation can cost at least $600 per square foot for the shingles. 2  Or run $750 per square foot for a standing seam steel roof. 3  Aluminum metal roof: Can cost anywhere between $700 and $1,200 per square foot.
Mass is the amount matter in an object. Mass is usually expressed in grams/pounds. For example, if you had a mass of 100 pounds and you went to the moon, you would still have â¦ a mass of 100 pounds, because there is 100 pounds of matter in you. However, your weight, or the gravitational pull on you, would change.
Mass is simply how much stuff there is in the object. Weight depends on the strength of the gravitational field the object is in. Lets say you have a brick with a mass of 60 kilograms. On Earth it would weigh 60 kilograms. On the moon, with one sixth the gravity it would weigh only 10 kilograms. But its mass is still the same at 60 kg. Its unfortunate that the units of mass and weight are the same (for metric countries). But it does simplify things when referring to masses in Earth's gravity (mass and weight are the same value on Earth).