The Cavendish balance shown in the figure below has two large lead balls, each of mass M = 1.5 kg, and two smaller lead balls, each of mass m = 0.8 kg. The lengths of the suspended rod to which the two smaller balls are attached and the fixed rod to which the larger balls are attached are both 40 cm as measured from the center of each lead ball. If the angle between the centers of the large and small balls is =22 with respect to the rotational axis established by the quartz fiber, find the force of gravitational attraction between each pair of large and small balls.
Optional question: What is the minimum angle, between the centers of the large and small balls with respect to the quartz fiber?
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