A new system of unit is devised in which unit length is 1 metre but the unit of mass and time are so chosen that c and G are of magnitude Unity ? What is the new unit of mass in kg

c - speed of light

G - universal gravitational constant

source :- Problem for physics students

author :- KF Riley

moment of inertia of a equilateral triangle about an axis passing through centre and perppendicular to the plane

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