Give reasons for the following:

Water does not run out of a dropper unless its rubber bulb is pressed.

Give reasons for the following:

Two holes are made in a sealed oil tin to take out oil from it.

Find the moment of force of 20 N about an axis of rotation at a distance of 0.5 m from the force.

The moment of a force of 25 N about a point is 2.5 N m. Find the perpendicular distance of force from that point.