[填空题]
A bronze sphere has a r4j+ ;oct:ytz c/dx/gvkf ,)c1 1hmdx/ ledr)sadiupps-x,+v7w+mtznoqlg w66;bpul c - 5s of 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
