Consider the stagnant air at the front edge of a wind and the air rushing over the wing surface at a speed v. Assume pressure at the leading edge to be approximately atmospheric and find the greatest value possible for v in streamline flow; assume that air is incompressible and use Bernoulli’s equation. Take the density of air to be 1.2 kg/m³. How does this compare with the speed of sound under these conditions (340 m/s)? Can you explain the difference? Why should there be any connection between these quantities?

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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