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

Physics & Space Science

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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

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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

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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?

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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

Physics & Space Science