Steel has a density of 8030kg/m^3. Show that a steel ball with a diameter of 5cm weighs approximately 5N

Using Weight = mass*gravitational strength

Using: Mass = density * volume

Using Volume = (4/3)pir³

Radius = 2.5cm = 0.025m

Volume = (4/3)pi0.025³ = 0.00006544 m³ (to 4 siginificant figures)

Mass = 8030 * 0.00006544 = 0.5256 kg (to 4 significant figures)

Weight = 0.5256 * 9.81 = 5.155 N (to 4 signigicant figures)

5.155 is approximately 5, therefore weight of the steel ball is approximately 5N