Applied Mechanics and Graphic Statics
A Second's pendulum gains 2 minutes a day. To make it to keep correct time its length

Is not changed but weight of the bob is decreased
Must be decreased
Must be increased
Is not changed but weight of the bob is increased

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Applied Mechanics and Graphic Statics
Kinetic friction may be defined as

Angle between normal reaction and resultant of normal reaction and limiting friction
Friction force acting when the body is in motion
Friction force acting when the body is just about to move
Ratio of limiting friction and normal reaction

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