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12)----) a quantity expressing a body's tendency to resist angular acceleration, which is the sum of the products of the mass of each particle in the body with the square of its distance from the axis of rotation.
13 I don't know sorry
14)----) Let v be the maximum speed of the car which is moving around a curve of radius 40 m and it is moving with this velocity without slipping. So, frictional force = centripetal force
μmg=Rmv2
v2=μgR
v2=0.5×40×9.8
v2=196m/s
v=14m/s
μ is coefficient of friction between car and tyre.
R is the radius of curve
v is the velocity of a car
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