Give reason for the statement that " The rotating wheels of any vehicle throw out mud, if any tangentially".

Give scientific reasons for the following statements: Variation is necessary for the maintenance of existence of any species.

Give reason of camphor disappears without leaving any residue

A wheel of radius R has an axle of radius R//5 . A force F is applied tangentially to the wheel. To keep the system in a state of "rotational" rest, a force F' is applied tangentially to the axle. The value of F' is

A wheel of radius R has an axle of radius R//5 . A force F is applied tangentially to the wheel. To keep the system in a state of "rotational" rest, a force F' is applied tangentially to the axle. The value of F' is

Give reasons, (any 2) Bats can navigate in the dark.

Give reasons, (any 2) Methane is used as a domestics fuel.