Nitrogen is expanded isentropically. Its temperature changes from 620 deg F to 60 deg F·The volumetric ratio is (V2 /V1) = 6.22 and the value of R for Nitrogen is 0.0787 Btu/lbm°R.Wnat is the work done by the gas?

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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