Helium flows through a 0.30 m diameter horizontal pipe with a temperature of 20°C and a pressure of 200 kPa (abs) at a rate of 0.30 kg/s. If the pipe reduces to 0.25 m diameter, determine the pressure difference between these two sections. Assume incompressible, inviscid flow.

What is the rate of 12 liters of water moving through a water hose in 4.0 minutes?

Ahorizontal force of 400.0 n is required to pull a 1760 n truck across the floor at a constant speed. find the coefficient of sliding friction.

The largest observatory complex in the world is on mauna kea, the tallest mountain on earth. what are some factors astronomers consider when selecting an observatory site? don’t forget practical ones. should astronomers, for example, consider building an observatory on denali (mount mckinley) or mount everest?