Answer to Question #286713 in Classical Mechanics for elle

Question

your grandmother gave you a gold ring as a gift. the gold ring is 5mm thick and has an outside diameter of 12mm and an inside diameter of 11mm. the density of gold is 1.93 x 10^4 kg m^3. what is the volume of the ring in cubic millimeter? what is the mass of the ring in grams? what is the market value of the ring if the price of gold is P1836.15 per gram? what is the volume of the ring in m^3? what is the mass of the ring in kg?

Answer 1

Volume:

$$V=\pi(R^2-r^2)h=361\text{ mm}^3\equiv361·10^{-9}\text{ m}^3.$$

Mass of the ring:

$$m=\rho V=6.98\text{ g}\equiv6.93·10^{-3}\text{ kg}.$$

Market value:

$$C=pm=\text P12816.$$