For which of the following refrigeration systems/appliances would it be permissible to use a passive recovery device for refrigerant recovery? A. a centrifugal air conditioner
B. a reciprocating liquid chiller
C. a single compressor, large commercial walk-in freezer
D. a domestic refrigerator

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

a skateboard rolling across the street - apex

conservation of mass

mass before something happens = mass afterwards

365.25 earth days are in the year of a light year