#1. what is the volume in cm^3 o a regular cylinder measuring 5.78 cm tall and 9.2 mm in diameter?
#2.what is the mass of the object above(#1) if it is pure gold?
2007-09-18 10:14:38 · 2 answers · asked by Koala J 1 in Science & Mathematics ➔ Mathematics
Convert the diameter to cm; divide by 2 to find the radius. Volume of a cylinder = pi * r^2 * h.
Multiply that volume * the density of gold (find it in your book or from a periodic table) to find the mass.
2007-09-18 10:33:00 · answer #1 · answered by Mathsorcerer 7 · 0⤊ 0⤋
Volume of a cylinder is given by:
V = pi r^2 h.
Be careful with the units, it`s to be in cm^3, so you have to change 9.2mm into cm, which is 0.92 cm, so the radius is half of that, 0.46 cm, so
V = 3.14 x 0.46 x 0.46 x 5.78 cm^3
I`ll leave you to calculate that.
I can`t do (2) since you haven`t given the density of gold, and I don`t know it ! Just multiply the volume by the density.
Hope this helps, Twiggy.
2007-09-18 10:39:06 · answer #2 · answered by Twiggy 7 · 0⤊ 0⤋