The unit of pressure is derived unit, why?

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?

Which are advantages of renewable resources? check all that apply. renewable energy supplies are completely reliable everywhere. some renewable resources will never be used up. little or no waste is produced by renewable resource plants. electricity can be generated in large quantities. many renewable energy facilities have lower operating costs.

How many neutrons does plutonium -196 with an atomic number of 78.