[填空题]
A bronze sphere has a n/nkr 8rxqfm/b0k.6gx 6r nyzd5 r1+j radius ofvc8aqe2gmz, + 10.5 $\mathrm{~cm}$ .
1. Find the volume of the sphere, expressing your answer in the form a $\times 10^{k}$, $1 \leq a<10 $ and $k \in \mathbb{Z}^{+}$ .
The sphere is to be melted down and remoulded into the shape of a cone with a height of 11.9 $\mathrm{~cm}$ .≈ $\times 10^3$cm
2. Find the radius of the base of the cone, giving your answer correct to 3 significant figures.≈ cm
