(a) why do we call this system a self-pumping system? (b) suggest why the system needs a pump on cold nights.

Avehicle has an oil leak that is causing the entire oil pan to be wet, but inspection reveals no exact source after cleaning off the oil residue. technician a says to install a fluorescent dye in the crankcase and operate the engine, then re-inspect for leaks with a special light (black light). technician b says the oil leak may be coming from a source at the top of the engine, such as a valve cover gasket. who is correct?

Why don't you see your reflection in water with waves or repples

Individuals who live below the poverty line get seriously ill more often than those who do not what could be the hidden variable in this situation?