Calculate the potential energy stored in an object of mass 50 kg at a height of 20 m from the ground.
(g=10 m/s2)
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Oxygen undergoes an isentropic expansion from 120 degree c and 280 kpa absolute to 140 kpa absolute. determine the final temperature of the oxygen and the amount of work per kg of o_2 produced in the process if it is adiabatic.

Which notation is used to represent an alpha particle? a. b. c. d.

The energy released by a nuclear fusion reaction is produced when