The silvering in thermo flask is done to avoid heat transfer by

Conservation of momentum in a collision between particles can be understood on the basis of

Two forces, one of 3 N and another of 4 N are applied on a standard 1 kg body, placed on a horizontal and frictionless surface, simultaneously along the X-axis and the Y-axis, respectively, as shown below.

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The magnitude of the resultant acceleration is

Magnetic meridian is an imaginary