If the moment of inertia of a section about its axis is I and its effective sectional area is A, its radius of gyration r about the axis, isa.r=I^2/Ab.r=(I/A)^2c.r=I/Ad.r=(I/A)^0.5Clear my choice

A composite object is made of two disc-shaped sections A and B, as shown in the figure, and is rotating about an axis through the center of disc A. The masses and the radii of discs A and B are respectively 2 kg and 0.2 kg, and 25 cm and 2.5 cm. What is the moment of inertia of the composite object?

The moment of inertia of a uniform cylinder of length l and radius R about its perpendicular bisector is I. What is the ratio l/R such that the moment of inertia is minimum ?

What will be the moment of inertia of the disk of radius 0.5m and mass 1kg?a.125kgm2b.0.125kgm2c.12.5kgm2d.1.25kgm2

A majorette takes two batons and fastens them together in the middle at right angles to make an "x" shape. Each baton was 0.90 m long and each ball on the end is 0.20 kg. (Ignore the mass of the rods.) What is the moment of inertia if the arrangement is spun around an axis through the center perpendicular to both rods?Select one:a.0.075 kg·m2b.0.096 kg·m2c.0.064 kg·m2d.0.16 kg·m2

Mass per unit area of a circular disc of radius a depends on the distance r from its centre as σ(r) = A + BrThe moment of inertia of the disc about the the axis, perpendicular to the plane and passing through its centre is :