2021 May TZ1 P1 Q2

The diameter of a spherical planet is \(6 \times 10^4\) km.

1. Write down the radius of the planet.

   [1]

The volume of the planet can be expressed in the form \(\pi(a \times 10^k)\) km\(^3\) where \(1 \leq a < 10\) and \(k \in \mathbb{Z}\).

2. Find the value of \(a\) and the value of \(k\).

   [3]