What is some of the evidence that Cygnus X-1 is a black hole?
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The mass of the invisible object, based on Kepler's Laws, is about 10 solar masses, well over the 3 solar mass limit on a neutron star. The electromagnetic radiation varies over milliseconds, indicating that the area emitting the radiation is comparable in size to a football field. The temperature indicated by the x-ray emission indicates millions of kelvins, consistent with an accretion disk around a black hole.
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State the underlying physical principle of Gauss's Law
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A star remains on the main sequence for a time span equal to _____ of its total existence as an energy-generating star
A) 90 percent B) 40 percent C) 15 percent D) 55 percent
In a single-slit diffraction experiment, a beam of monochromatic light passes through a slit of width 11.0 ?m
If the first order dark fringe of the resulting diffraction pattern is at an angle of 4.31°, what is the wavelength of light? A) 827 nm B) 301 nm C) 602 nm D) 402 nm E) 201 nm
An object with mass m and moment of inertia I is spinning with an angular momentum L. Its kinetic energy is:
a. 0.5I2/L. b. 0.5L2/I. c. 0.5L2/m. d. 0.5I2/m.