Find the volume and solve the applications.

A steel reinforcing rod is 12 ft. long and 1" thick in diameter. If a cubic foot of steel weighs 490 lb., how much does the rod weigh (to the nearest pound)?

____pounds

Question

Find the volume and solve the applications.

A steel reinforcing rod is 12 ft. long and 1" thick in diameter. If a cubic foot of steel weighs 490 lb., how much does the rod weigh (to the nearest pound)?

____pounds

anonymous · Answer

@JakeV8 Im not sure about this one

anonymous · Answer

clues:

given dimensions of a rod... perhaps could calculate something about the rod
weight of a cubic foot of steel:   "Cubic foot"... sounds like a volume question!

anonymous · Answer

r=0.5

anonymous · Answer

How much steel is in that rod?  Can you find its volume, which would be measured in cubic feet?

If you knew how many cubic feet of steel is in the rod, and you know how much a single cubic foot of steel weighs, then you can multiply and get the total weight.

anonymous · Answer

oops, it's 1 inch, not 1 foot like I marked it !!

anonymous · Answer

|dw:1349282433288:dw|

anonymous · Answer

it weight 490 pounds

anonymous · Answer

that's for 1 cubic foot, but you need to find out how much volume is in the rod... it could be more than or less than 1 cubic foot.

anonymous · Answer

volume of cylinder = (area of the circle that is the base & top) X height

But you have to use consistent units... can't mix inches and feet.  Need to convert radius to feet.