What are two similarities and two differences between the strong nuclear force and weak nuclear force?

What is hidden during a lunar eclipse? isn't the moon hidden?

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.