A uniform rod of mass M and length L lies along the x axis with its center

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A uniform rod of mass M and length L lies along the x axis with its center at the origin. Consider an element of length dx at a distance x from the origin.

(a) Show that this element produces a gravitational field at a point x0 on the x axis (x0 > ½L) given by

GM dx dg, L(xo – x)²'

(b) Integrate this result over the length of the rod to find the total gravitational field at the point x0 due to the rod.

(c) What is the force on an object of mass m0 at x0?

(d) Show that for x0 >> L, the field is approximately equal to that of a point mass M.

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