4. A certain area has the following properties: Ix = 28 in4; ly = 66 in4; Pxy = 36 in4, determine the maximum and minimum moments of inertia and the angle that the axis of maximum inertia makes with the x-axis. Illustrate the diagram.

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A: Molten rock:

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A: Metamorphic:

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Electric Circuit and Components

An electrical circuit or electrical network is a pre-determined pathway to make the electrons flow in the desired direction. The flow of electrons will set up a current flow in the circuit. Normally, the flow of electrical current is opposite to the flow of electrons. An electron is a fundamental sub-atomic particle of an atom possessing a negative charge. To initiate the flow of current and achieve the desired output, the electrical circuit should necessarily be composed of closed pathways. The pathways are made-up of good conductors of electricity such as aluminium and copper.