The expression for the cube root of 5 can be expressed using a rational exponent. The cube root of a number \( x \) can be represented as \( x^{1/3} \).
Therefore, the cube root of 5 is:
\[ \sqrt[3]{5} = 5^{1/3} \]
So, the equivalent expression using a rational exponent for \( \sqrt[3]{5} \) is \( 5^{1/3} \).