\textbf{166.} A car with a mass of 3 tons moves on a horizontal surface along a circular path at a constant speed. If the maximum force from the ground on the car is $10^4 \times \sqrt{10}\,\text{N}$ and $g = 10^4$, the centripetal force exerted on the car is how many newtons? $\left(g = 10\,\dfrac{\text{m}}{\text{s}^2}\right)$
(1) $10^3$ \qquad (2) $10^4$ \qquad (3) $3\times10^3$ \qquad (4) $3\times10^4$