Engineering Mechanics
A trolley wire weighs 1.2 kg per meter length. The ends of the wire are attached to two poles 20 meters apart. If the horizontal tension is 1500 kg find the dip in the middle of the span

4.0 cm
2.5 cm
5.0 cm
3.0 cm

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Engineering Mechanics
The static friction

All of these
Is independent of the area of contact, between the two surfaces
Bears a constant ratio to the normal reaction between the two surfaces
Always acts in a direction, opposite to that in which the body tends to move

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