Applied Mechanics and Graphic Statics
To double the period of oscillation of a simple pendulum

Its length should be quadrupled
Its length should be doubled
The mass of its bob should be doubled
The mass of its bob should be quadrupled

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Applied Mechanics and Graphic Statics
The angle of friction is:

The angle between the normal reaction and the resultant of normal reaction and limiting friction
The ratio of the friction and the normal reaction
The force of friction when the body is in motion
The force of friction at which the body is just about to move

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