i need the answers with explanation 11. Given that the density of Al is 2.70 g/c

Question

i need the answers with explanation

11. Given that the density of Al is 2.70 g/cm3, determine the thickness of a rectangular sheet of Al that measures 18.76 cm x 35 cm and weighs 120.230 g. 12. Nichrome is an alloy that typically consists of 80% Ni and 20% Cr. What is the length (in cm) of a piece of 18-gauge nichrome wire if its mass is 0.379 g and its density is known to be 8400 kg/m3? and its density is known to be 8400 kg/m? 13. The cobalt-chromium chunk of metal that is used as a femoral head has a density of 6.27 g/cm'and a mass of 207 g If it were a perfect sphere, what would its diameter be (in cm)?

Explanation / Answer

11) Density = Mass/Volume

Volume = Mass/Density = 120.230g/(2.7 g/cm^3) = 44.040 cm^3

thickness * 18.76cm * 35cm = 44.040 cm^3

thickness = 0.067cm

13)

Density = Mass/Volume

Volume = 207/6.27 cm^3 = 33.014 cm^3

4/3 * pi * r^3 = 33.014

r^3 = 7.8855

r = 1.99042

D = 2 * r = 3.9808 cm

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