Which of the following is unitless and dimensionless ?

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00:00question says which of the following is unit less and dimensionless a velocity B

00:14force C weight D coefficient of friction is the unit of velocity is meter per

00:26second and its dimensions are LT inverse the unit of force is Newton which is

00:35equal to kilogram into meter per second square so its dimensions are MLT power

00:44minus 2 and the unit of weight is also Newton which is equal to kilogram into

00:52meter per second square so its dimensions are MLT power minus 2

01:01coefficient of friction is the ratio of force of friction and normal reaction so

01:11it is ratio between two same physical quantities the unit of force of friction

01:17is Newton and also the unit of normal reaction is Newton so Newton will be get

01:23cancelled with Newton so coefficient of friction will be unit less and

01:31dimensionless so the correct option will be D coefficient of friction