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A. The moment of inertia of a balloon about a diameter passing through its centre increases as the balloon is inflated.

B. The three axes associated with the principal moments of inertia of a body are orthogonal (i.e. mutually at right angles), or they can be chosen to be orthogonal.

C. Torque is equal to the rate of change of angular momentum.

D. Gyroscopes can be sued to stabilise spacecraft.

E. A prolate spheroid (a rugby ball) has three principal moments of inertia with different values.