If P represents radiation pressure, C represents the speed the speed of light and Q represents radiation striking unit area per second, then non non zero integers x, y&z such that [(P^x)(Q^y)(C^z)] is dimensionless are

A) X equal to 1, Y equal to 1, Z equal to -1

B) X equal to 1 ,Y equal to -1 ,Z equal to 1

C) X equal to -1, Y equal to 1, Z equal to 1

D) X=Y=Z=1

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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