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This will be the speed of the earth's surface (due to its spinning) at that location. The speed is calculated by multiplying the earth's angular speed of 1 rev. per day (you should convert that to rev. per second) times the distance from the 42 parallel line (circle) to the spin axis. You have to use trig to get that distance. Draw a radius from earth's center to any point on 42nd parallel. Then draw a perpendicular horizontal line from that point to the earth's spin axis. The spin axis, radius and horizontal line you drew form a right triangle. The angle between the radius you drew and the spin axis is 90 - 42 = 48 (because 42nd parallel is the angle of your radius measured up from the equator). Now you know one side of the triangle (the earth's radius which you can look up) and all the angles, 90, 48 & 42. Can you take it from there.

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16y ago

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