Using vernier callipers, the diameter of a brass metal bob the bob is determined as 1.96 cm and the mass is 29.95 g. find the density to correct significant figures .

Density = Mass / Volume.

Mass = 29.95 g.

Volume,  diameter = 1.96 cm , radius = 1.96/2 = 0.98 cm.

The metal bob is a sphere

Volume of sphere = (4/3)πr³= (4/3)*π*0.96³ ≈ 3.9425 cm³

Density = 29.95g / 3.9425 cm³ ≈ 7.597 g/cm³

Recall 1 g/cm³ = 1000 kg/m³

Density ≈ 7.597 g/cm³ or 759.7 kg/m³

The objects do not reach terminal velocity         there is not enough time from the time the object falls from when it hits the ground to achieve terminal velocity. an object must be placed higher to achieve terminal velocity in order to be in free fall.

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