Strength of Materials
The resultant of the following three couples 20 kg force, 0.5 m arm, + ve sense 30 kg force, 1 m arm, – ve sense 40 kg force, 0.25 m arm, + ve sense having arm of 0.5 m will be

10 kg, - ve sense
20 kg, - ve sense
20 kg, + ve sense
10 kg, + ve sense

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Strength of Materials
Coefficient of friction is the

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

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