$A$ regular polygon of $n$ sides has $170$ diagonals,then $n$ is equal to

$A$ uniform rod $AB$ of mass $m$ and length $l$ is at rest on a smooth horizontal surface. An impulse $P$ is applied to the end $B$. The time taken by the rod to turn through a right angle is

$\int_{-2}^2 |[x]| \, dx$ is equal to

The most popularly known blood grouping is the $ABO$ grouping. It is named $ABO$ and not $ABC$,because '$O$' in it refers to having

Which one of the following is not considered as part of the endomembrane system?

Vitamin $K$ is required for: