Question

5) A student is given a metal sphere about the size of a softball and asked to identify what type of

metal is it made of. It has a radius of 5 cm and a mass of 5.915 kg. Is it Aluminum, Zinc, Iron,
Silver, Lead, or Platinum?

Answer 1

Answer: Radius of a solid aluminium sphere is 3.67 cm.

Explanation:

4/3 · 2.57³ π · 7,860 = 4/3 · r³ π · 2,700 / : 4/3 π

2.57³ · 7860 = r³ · 2,700

r³ = 2.57³ · ( 7,860 : 2.700 ) = 2.57³ · 2.911111... /∛

r ≈ 2.57 · 1.428 = 3.67 cm