3. The diameter of a metallic ball is 4.2 cm. What is the mass of the ball if the density
the metal is 8.9 g per cm?
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16
Answer:
345.32 g
Step-by-step explanation:
Diameter = 4.2
Radius = Diameter / 2 = 4.2 cm / 2 = 2.1 cm
Volume of ball = (4/3)πr³
= 4/3 × 22/7 × (2.1 cm)³
= 38.8 cm³
Mass = Volume × Density
= 38.8 cm³ × 8.9 g/cm³
= 345.32 g
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