How many years ago Mars was formed?
A. 4.5 billion years
B. 3 billion years
C. 4.5 million years
D. 4 billion years
Answer: A. 4.5 billion years
Physics & Space Science
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Protostars shine brightest in
A. radio waves. B. visible spectrum. C. X-ray. D. infrared spectrum.
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Stare at a red wall for a few minutes and then gaze at a white wall. Due to retina fatigue you see
A) more red. B) cyan. C) black.
Physics & Space Science
Assume you are a particle in a box called the universe. Estimate your minimum kinetic energy. (Assume the "edge" of the box is at a distance of 20. Giga Light Years.)
What will be an ideal response?
Physics & Space Science
A drive shaft resists torsional shear stress of 45 MPa and axial compressive stress of 100 MPa. The ratio of the magnitudes of the principal stresses (?1/?2) is approximately:
(A) 0.15
(B) 0.55
(C) 1.2
(D) 1.9
Physics & Space Science