Two systems have the following equations of state, where R is the gas constant per mole. The mole numbers are N1 = 3 and N2 = 5. The initial temperatures are T1 = 175 K and T2 = 400 K. What is the temperature once equilibrium is reached (in Kelvin)?

what do you mean?

most untrained people can comfortably hold their breath for 25 to 30 seconds before gasping underwater but people in good health can hold their breath for approximately one to two minutes.

explanation:

nobody pulgs their while going under water unless there pisoion in water idk were do u need to plug ur nose underwater