What is the mechanical advantages of the screw shown below

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The upward force acting on the wing of a airplane in flight is known as the "lift" force. (d)

Year  1936,  lehman predicted that the earths 'inner core' is solid. she observed that the seismic signals during her study were bent and did not pass through instead bouncing back. later it was confirmed that the earth's inner core was solid made up of nickel-iron and had a molten outer core.