What magnitude of (constant) force applied horizontally

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In the figure, what magnitude of (constant) force F applied horizontally at the axle of the wheel is necessary to raise the wheel over an obstacle of height h = 3.00 cm? The wheel's radius is 6.00 cm, and its mass is m = 0.800 kg.
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I'm sorry I couldn't grasp it at all; if the moment arm is the distance from the pivot to the place where the force is acting, then the moment arm is the radius. Please walk me through!

andrewjustin
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you are an absolute life saver. God's gift to this earth you are, WNY.

johnmeehan
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very clear diagram and explanation, thanks.
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robertberman