A small person with a surface area of about 1.0 m2 must (by the Stefan–Boltzmann law) radiate energy at a rate that would require eating 11,000 food calories a day if they are naked in a vacuum in deep space. Which do you think is the most important reason that someone sitting in a normal room requires less than 2000 calories a day?
A. Wearing clothes reduces the radiation loss.
B. Wearing clothes reduces heat loss due to convection.
C. A person has an emissivity ? much smaller than 1.
D. The person absorbs radiation from the room.
E. The surrounding air insulates the person.
F. Something else (specify).
D. The person absorbs radiation from the room.
You might also like to view...
A ball is thrown with an initial velocity of 20 m/s at an angle of 60° above the horizontal. If we can neglect air, what is the horizontal component of its instantaneous velocity at the exact top of its trajectory?
A) 10 m/s B) 17 m/s C) 20 m/s D) zero
A 30 feet high vertical wall is separated from a glass wall parallel to it, as shown. When the wall surface temperature is 85ºF and the glass temperature is 25ºF, estimate the heat transfer between the two surfaces.
The rotation curve method can be applied only to pairs of galaxies orbiting each other
Indicate whether the statement is true or false
Like our solar system, the whole Milky Way is about five billion years old
Indicate whether the statement is true or false