Two spheres are cut from a certain uniform rock, one has radius 4.85 cm. the mass of the other is three times greater. find its radius.

6.99 cm

Explanation:

Mass of any sphere is defined by the formula,

Here, V is thew volume of sphere whose value is , m is the mass, is the density.

So according to the question two spheres are cut from same material means they have same density.

And mass of other sphere is 3 times mass of one and the radius of sphere 1 is 4.85 cm.

Now mass of sphere 1.

Now mass of sphere 2

Now according to question.

Put the values

Therefore, radius of other sphere is 6.99 cm.

the answer is 12 as i may remember

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