A diesel engine draws in air at the inlet at 95kPa pressure, 300K temperature. The engine has a compression ratio of 20:1. The heat released during combustion is 1300 kJ/kg. Using the cold air standard assumptions, please calculate: a) The temperature after combustion.
b) The cycle efficiency
c) The mean effective pressure for the cycle
d) The cutoff ratio for the cycle

is there multiple choice answers?

beta decay is the answer

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.