First slide

Physical quantities and units

Question

A suitable unit for gravitational constant is

Easy

A

$k g - m s^{- 1}$
B

$N m^{- 1} s$
C

$N m^{2} k g^{- 2}$
D

$k g m s^{- 1}$

Solution

$∵ F = G \frac{m_{1} m_{2}}{r^{2}}$
$G = \frac{F r^{2}}{m^{2}} \Rightarrow \frac{N m^{2}}{k g^{2}}$

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