Near the surface of the planet, the Earth's magnetic field is about 0.50 × 10^?4 T. How much energy is stored in 1.0 m3 of the atmosphere because of this field?


9.9 × 10^?4 J

Physics & Space Science

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O and B associations are poor spiral tracers

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It is important for the continued existence of all life that not all the copies of deoxyribonucleic acid (DNA) be exact duplicates

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A prismatic bar (diameter d0 5 18 mm) is loaded by force P1. A stepped bar (diameters d1 5 20 mm and d2 5 25 mm with radius of fillets R 5 2 mm) is loaded by force P2. The allowable axial stress in the material is 75 MPa. The ratio P1/P2 of the maximum permissible loads that can be applied to the bars, considering stress concentration effects in the stepped bar, is:

(A) 0.9
(B) 1.2
(C) 1.4
(D) 2.1

Physics & Space Science

Even if Martian meteorites contained life, the life could not possibly have survived the journey from Mars to Earth

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Physics & Space Science