According to the Stefan–Boltzmann law, an object at room temperature that is sitting in a room (also at room temperature) must emit electromagnetic radiation. Since it is losing energy by emitting this radiation, why does its temperature remain constant?
A. It receives heat by conduction from the air and from what it is sitting on.
B. It receives heat by convection from the air.
C. It receives heat by radiation from objects in the room.
D. All of the above.
E. Its temperature actually does decrease.
F. It does not actually emit any radiation.
T. Some other explanation (specify)
T. Some other explanation (specify)
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An incompressible fluid is flowing through a vertical pipe with a constriction. The wide section is 2.00 cm in diameter and is at the top of the pipe. The pressure of the fluid in the wide section at the top is 200 kPa. The velocity of the fluid in the wide section is 4.00 m/s. The narrow section is located 2.00 m below the wide section. What is the diameter of the narrow section for the pressure of the fluid in the narrow section to equal the pressure in the wide section? (density of the fluid is 1,000 
A. 1.46 cm B. 1.20 cm C. 1.10 cm D. 0.90 cm E. 0.75 cm
What is the minimum uncertainty in determining the position of an electron if the speed of the electron is 6000 m/s within an accuracy of 0.004%?
A) 0.105 mm B) 0.153 mm C) 0.241 mm D) 0.335 mm E) 0.483 mm
Imagine you are plunging into the Sun, starting from Earth. Briefly describe what you will experience on your journey
What will be an ideal response?
The Milky Way is considered to be an intermediately wound, barred spiral, which would be type ________, according to Hubble
A) SBb B) B2S C) Sa D) E4 E) SBV