How did the lens, cornea, and retina work together to make human vision possible?

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?

Consider a one meter long horizontal pipe with a constant 100 cm^2 cross sectional area. water flows rightward into the pipe at x = 0 with flow velocity 02m/sec at every point within the pipe intake area. at x=1, the rightward flow rate is 0.192 m/sec. assume the water is a conserved quantity in the pipe, so there must be a leak (a sink) somewhere in the pipe. 1. compute net volumetric flow of the source if the system to be in equilibrium. 2. now assume the pipe in the problem has no leaks. compute the net volumetric rate of change for the system.