Which of these is the subject of study in thermodynamics A. energy changes
B. only physical changes
C. only chemical changes
D. structure of atoms and molecules

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explanation:

14 days is the half-life of phosphorus-32

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.

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