Find the mass of each metal ball described. Round your answers to the nearest tenth.

Question

1. a copper ball 1.2 cm in diameter

2. a gold ball 0.6 cm in diameter

3. an aluminum ball with radius 3 cm

4. a platinum ball with radius 0.7 cm

Answer 1

Volume of a sphere: V = (4/3)(pi)(r^3), where r = radius = 1/2(diameter)

For all of these questions, use this formula to calculate the volume of the ball, which is in the shape of a sphere.

Density = mass/volume, so mass=density*volume.

If you know the density of the metal, you can it into the formula above to solve for mass.