A laboratory centrifuge on earth makes n rpm rev/min and produces an acceleratio

A laboratory centrifuge on earth makes n rpm rev/min and produces an acceleration of 6.90g at its outer end.What is the acceleration (in g’s, i.e., acceleration divided by g) at a point halfway out to the end?a=?gThis centrifuge is now used in a space capsule on the planet Mercury, where g Mercury is 0.378 what it is on earth. How many rpm (in terms of n) should it make to produce 4 gMercury at its outer end?