Question

Gravity meters measures in units of mGal where 1 Gal (or 1 galileo) is the C.G.S unit of acceleration due to gravity. A gravity meter shows a reading of +300 mGal at a place where the normal 'g' is 9.78 $m{s}^{-2}$. The correct 'g' at that place where the reading was taken is _____ $m{s}^{-2}$.

• A. 9.777
• B. 9.783
• C. 9.75
• D. 9.81

Answer 1

The correct option is B 9.783

A body has weight due to the fall under the action of gravity. The unit of gravity is gal in C.G.S (named after Galileo). $1Gal=\frac{1cm}{se{c}^2}$.

$+300mGal=0.3\times {10}^{-2}m{s}^{-2}=0.003m{s}^{-2}$

$\therefore g=9.78+0.003=9.783m{s}^{-2}$