To find mass of the cube first find volume of cube material
edge of cube = 10 cm edge of inner cube (hollow space) = 10 - (2.5+2.5) = 5 cm
total volume of cube = 10^3 = 1000 total volume empty space = 5^3 = 125 Volume of cube material = 1000 - 125 = 875 cm^3
Mass of cube = density x volume = 7.9x10 x 875 = 69125 g <span>= 69.125 kg
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Put the given information into the formula and solve for the variable of interest. .. V = π*r^2*h .. 24 = π*(h/3)^2*h .. 24 = π/9*h^3 .. 9*24/π = h^3 .. ∛(216/π) = h .. h = (6/π)√(π^2) ≈ 4.097 . . . . units
