Derive the general energy equation for conduction heat transfer through a homogeneous, isotropic media in cylindrical coordinates, Equation 2-19.


Referring to the cylindrical element sketch, you can apply an energy balance, Energy in –

Energy Out = Energy Accumulated in the Element. Then, accounting the energies in and

out as conduction heat transfer we can write





Physics & Space Science

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If helium nuclei and protons are each accelerated from rest through the same potential difference, how do the resulting speeds compare?

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Each diagram shows five star circles. Look at the first circle to the north of the celestial equator on each diagram. Can you characterize the declination of stars on this circle? If so, what is it? Can you characterize the right ascension of stars on this circle? If so, what is it?

What will be an ideal response?

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The presently accepted value of the Hubble constant gives an age of:

A) 4.5 billion years. B) 8-9 billion years. C) 14 billion years. D) 18 billion years. E) 22 billion years.

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The fluid to which Bernoulli's equation is applied is based on what being conserved for the fluid?

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Physics & Space Science