Explain interferometry and provide an example of an observatory that uses this technique
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Astronomers have been able to achieve very high resolution by connecting multiple telescopes together to work, in a sense, as if they comprised a single, very large telescope. This method of synthesizing a large "virtual" telescope from two or more smaller telescopes is known as interferometry. The images from such an interferometric telescope are not limited by the diffraction fringes of the individual small telescopes but rather by the diffraction fringes of the much larger virtual telescope.
In an interferometer, light from the separate telescopes must be brought together and combined carefully. The path that each light beam travels must be controlled so that it is known to a precision of a small fraction of the light's wavelength.
Some examples include the Very Large Array in New Mexico, Atacama Large Millimeter/submillimeter Array in northern Chile, the European Very Large Telescope in Chile, and the Large Binocular Telescope in Arizona.
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State the reciprocity law.
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A cylindrical tank is assembled by welding steel sections in a helical pattern with angle ? 5 50°. Tank diameter is 1.6 m, thickness is 20 mm, and internal pressure is 2.75 MPa. Modulus E 5 210 GPa and Poisson’s ratio ? 5 0.28. The normal stress acting perpendicular to the weld is approximately:
(A) 39 MPa
(B) 48 MPa
(C) 78 MPa
(D) 84 MPa
Based on the idea of "spaceship Earth," write one or two paragraphs explaining why it is not the case that we are "just sitting here."
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A 5.0-g particle moving 60 m/s collides with a 2.0-g particle initially at rest. After the collision each of the particles has a velocity that is directed 30° from the original direction of motion of the 5.0-g particle. What is the speed of the 2.0-g particle after the collision?
A. 72 m/s B. 87 m/s C. 79 m/s D. 94 m/s E. 67 m/s