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

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

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Applied Mechanics and Graphic Statics
The phenomenon of collision of two elastic bodies takes place because bodies

All listed here
Tend to compress each other till they are compressed maximum possible
Immediately after collision come momentarily to rest
Attempt to regain its original shape due to their elasticities

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