A rod of mass m, length l, area of cross section a and modulus Y is rotating about an axis passing through one of its end perpendicular to its length with angular velocity ω. Find the strain at the center of the rod.

1) (mω²L)/(4AY)

2) (3mω²L)/(4AY)

3) (mω²L)/(8AY)

4) (3mω²L)/(8AY)

Three identical balls are placed on a frictionless horizontal surface touching each other. They stick to each other because of adhesive. Another ball of same radius and mass m is placed over the void created by the three balls. Find the forces applied by the balls kept on the floor to each other if the system remains in equilibrium.

A car loaded with water having total mass 1000 kg moves on a straight horizontal Road starting from rest under the action of a force of 100 Newton. The water spills throw a small hole in the bottom at a rate of 0.1 KG per second the velocity of cart after 300 seconds is nearly.

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