What force would be required to stretch a spring 1/2 of a meter if its spring constant is 180 n/m

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What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?

Panel bc in fig. p2.76 is semi-circular, with the 3 meter radius and horizontal straight edge through point b. compute (a) the hydrostatic force of the water on the panel, (b) its center of pressure, and (c) the moment of this force about point b. assume atmospheric pressure on the dry side of the panel