A train of 150 m length is going towards north direction at a speed of 10 ms-1 A parrot flies at a speed of 5 ms-1 towards south direction parallel to the railway track,The time taken by the parrot to cross the train is equal to
The percentage errors in the measurements of mass and speed are 2% and 3% respectively. How much estimate of the kinetic energy obtained by measuring mass and speed
Two points charges A and B separated by a distance R attract each other with a force of 12 x 10-3 N. The force between A and B when the charges on them are doubled and distance is halved
When a hydrogen atom is bombarded, the atom is excited to the n = 4 state of hydrogen atom. The energy released when the atom falls from n = 4 state to the ground state is