Two-Rod Stasis

Rod 1 1 is 1 m 1 \, \text{m} long and has mass M 1 = 1 kg M_1 = 1 \, \text{kg} . One end of Rod 1 1 is attached to a wall with a hinged support, and the other end is free.

Rod 2 2 is 1 m 1 \, \text{m} long and has mass M 2 M_2 . One end of Rod 2 2 is attached to the wall with a fixed (rigid) support, and the other end is free. Rod 2 2 is 1 m 1 \, \text{m} above Rod 1 1 .

Ambient Earth gravity is 10 m/s 2 10 \, \text{m/s}^2 downward. If the two rods are in stasis, and M 2 = σ × 1 0 11 kg M_2 = \sigma \times 10^{11} \, \text{kg} , what is the value of σ \sigma ?

Details and Assumptions:
- The universal gravitational constant is required, in addition to Earth gravity. G = 6.67 × 1 0 11 G = 6.67 \times 10^{-11}
- The hinged support for Rod 1 1 can supply horizontal and vertical forces, but it cannot supply moments
- Both rods are rigid and uniform


The answer is 1.809.

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