hello.sir..plzz reply as soon as possible..i have an test on sunday 8 aug...

..there is an arc OAB of radius 100m.with centre O.. which substend angle of 90 degree at the centre .a car of wieght 100 kg moves on arc.

what will be the friction force at point A and mid piont of arc.??

speed of vehicle is 5 m per s.

thankxxx

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.

11

21

31

41