Question

The energy equation, the total energy is equal to the sum of _______

(a) Kinetic energy + potential energy

(b) Kinetic energy + pressure energy

(c) Kinetic energy + potential energy + pressure energy

(d) Pressure energy + potential energy

This question was addressed to me in an international level competition.

The query is from Energy Equation topic in section Aerodynamics – Fundamental Principles and Equations of Aerodynamics

Answer 1

Correct option is (c) Kinetic energy + potential energy + pressure energy

Easiest explanation: The total energy is the sum of kinetic energy plus potential energy plus internal energy. Where kinetic energy is given by 0.5 m*v^2 where m is the mass and v is the velocity. Potential energy is given by PE=mgh where, m is the mass, g is the acceleration due to gravity and h is the height. The internal energy is denoted by ‘I’.