Ametal ball-bearing with a circumference of 45.1 mm weighs 11.6 g. what is the density of the metal in g/cm3 (v of a sphere = (4/3)ïr3; circumference of a circle = 2ïr)?

1) First of all, let's calculate the radius r of the ball-bearing. We know the value of the circumference:

From this, we can find the radius:


2) Now, let's find the volume:


3) Finally, we can calculate the density. We know the mass, , therefore we have

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