Question
Where is the centre of gravity of a uniform ring situated?
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Infrasonic waves
Ultrasonic waves
Electromagnetic waves
Radio waves
$\ce {^a_x P -> Q + ^0_-1 β}$
$\ce {^A_Z X \text ->[α] X_1 \text ->[γ] X_2 \text ->[2β] X_3}$
$\ce {^3_2He + ^2_1H -> _2He + _1H + energy}$
