I have two questions:-

1>A bit is at a distance L from one end of a long rod.Coefficient of friction between the rod and the bit is “meu”. The rod is moving with uniform accelaration ”alfa” about the vertical axis.The rod is always horizontal.After how long the bit will start sliding?There is no gravity.

2>A body is moving with constant velocity in a straight line parallel axis.Can he has any variable or constant angular momentum?Explain please!!!!

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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