For a galaxy to be active, the supermassive black hole needs to have matter flow into it
a. True
b. False
Indicate whether the statement is true or false
True
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What is the net power that a person loses through radiation if her surface area is 1.20 m2, if her emissivity is 0.895, if her skin temperature is 300 K, and if she is in a room that is at a temperature of 17°C?
The Stefan-Boltzmann constant is 5.670 × 10-8 W/m2 · K4. A) 60.3 W B) 62.6 W C) 65.7 W D) 68.4 W E) 64.8 W
A boy scout will be burned more severely by
A) 100 g of water at 100°C. B) 100 g of steam at 100°C. C) both about equally D) neither of these
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?
In order to have a global magnetic field, a planet must have
A) an electrically conducting fluid in its interior which is undergoing convection and a reasonably rapid rotation B) magnetic rocks in its interior C) magnetic rocks on its surface D) a large core of solid magnetized iron