Question

Calculate the density of a coin with a mass of 11.34 grams, a diameter of 30.61 mm and a thickness of 2.15 mm. Express the answer in grams/cubic centimeters using 3 significant numbers

Answer 1

Density= mass/volume

Here mass = 11.34 gm

Volume= (pi) r^2*h

r= radius= 15.31 mm= 1.53 cm , h= 0.21 cm

Plugging the values of r and h , volume = 1.54 m^3

Density= 11.34/1.54 gm/cm^3= 7.36 gm/cm^3