Process of Science: Why do scientists believe that black holes can't last forever, and do they have any observational evidence to support this idea?
What will be an ideal response?
Scientists surmise that if a particle-antiparticle pair came into existence near an event horizon and one particle crossed the horizon before they could annihilate, the source of energy for the surviving particle would be the black hole itself. This is called Hawking radiation. The theoretical grounding of this idea is strong, but it has not yet been observed.
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Because we know that the half-lives of many radioactive isotopes are millions of years, we can deduce that
a. the longer it exists the more radioactive nuclei Earth produces. b. the sun is the source of all the radioactive nuclei on Earth. c. there must have been many more radioactive nuclei on Earth when life began. d. there must have been far fewer radioactive nuclei on Earth before life began. e. the natural radioactivity of minerals on the Earth was created by the Earth's internal temperature.
The Shroud of Turin, the Iceman, and the Dead Sea Scrolls were dated by use of
a. Rubidium-87. b. Potassium-40. c. Carbon-14. d. Uranium-238.
Which is the latest stage of a star?
A) Helium collects within the core. B) Carbon collects within the core. C) The surface of the star expands into a red giant. D) The star contracts into a blue giant.
1.0 kg is at (-2.0, 2.0); 2.0 kg is at (2.0, -4.0); and 3.0 kg is at (2.0, 0.0)
(a) What is the x coordinate of the center of mass? (b) What is the y coordinate of the center of mass?