A hollow steel ball of diameter 3.0 m barely floats in water. What is the thickness of the wall of the ball? The density of iron is 7.87 g/cm³ and that of water is 1000 kg/m³. A) 6.6 cm B) 37 cm C) 131 cm D) 79 cm

Question

Quizplus · Accepted Answer

The volume of water displaced by the ball equals the volume of the ball's outer sphere. The weight of the displaced water equals the weight of the steel. By equating these and solving for the thickness, we find it to be approximately 6.6 cm.

A Hollow Steel Ball of Diameter 3