d
\(1 \mathrm{J}=2 \quad\) New system

\(\mathrm{n}_{2}=\mathrm{n}_{1}\left[\frac{\mathrm{M}_{1}}{\mathrm{M}_{2}}\right]\left[\frac{\mathrm{L}_{1}}{\mathrm{L}_{2}}\right]^{2}\left[\frac{\mathrm{T}_{1}}{\mathrm{T}_{2}}\right]^{-2}\)

\(\quad=1\left[\frac{\mathrm{kg}}{10 \mathrm{kg}}\right]\left[\frac{\mathrm{m}}{10 \mathrm{m}}\right]^{2}\left[\frac{10}{60}\right]^{-2}\)

\(\quad=\left(\frac{1}{10}\right)^{1} \times\left(\frac{1}{10}\right)^{2} \times(60)^{2}=36 \times 10^{-1}\)