What are the assumptions on which the cosmological principle is based?

Aplane flies directly between two cities, a and b, which are separated by . from a to b, the plane flies into a headwind. on the return trip from b to a, the wind velocity is unchanged. the trip from b to a takes less than the trip from a to b. what is the airspeed of the plane, assuming it is the same in both directions

Why there is no inductive reactance in dc circuits

Arrange the images in order to show how lake-effect snow occurs.