The two connected cylindrical rods above have the following values for their dimensions: d1 = 48 mm d2 = 23 mm l1 = 1.7 m l2 = 0.9 m if, f1 = 122 kn f2 = 61 kn find the average normal stress (σ) for the mid-section of rod bc. include the correct sign for your answer. calculate your answer to one decimal place, and make sure that the absolute value is between 0 - 999, with the appropriate unit. (in other words, if you use the correct unit, your answer's absolute magnitude will be between 0 - 999.)

d is the answer i came up with

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the aurora is formed when charged particles emitted from the sun during a solar flare penetrate the earth's magnetic shield and collide with atoms and molecules in our atmosphere. these collisions result in countless little bursts of light, called photons, which make up the aurora.

auroras are generated by charged solar particles hitting molecules in earth's atmosphere. this usually happens in high latitudes, because our planet’s magnetic field tends to funnel these particles toward the poles. that’s why it can be experienced in northern ohio.