An 80 cm plate of 500 g mass is hinged along one side. If air is blown over the upper surface only. What speed must the air have to hold the plate horizontal?

The slope of a velocity time graph over any interval of time gives the during that interval

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.

How does the strength of the electrostatic force between an electron and a proton compare to the strength of the gravitational force between them?