Question

The mass of a disc cut out of an iron
plate is proportional to the square of the
radius of the disc. If a disc with a radius
equal to 15 cm has a mass of 1.80kg,
what will the radius of a disc with a mass
of 0.20 kg?
​

Answer 1

Answer:

1.67

1.8/15 = 0.2/x

therefore when we calculate

answer is 1.67 cm