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
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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?
A. the protons attain twice the speed of the helium nuclei B. the protons attain 1.4 times the speed of the helium nuclei C. the helium nuclei attain twice the speed of the protons D. the helium nuclei attain 1.4 times the speed of the protons E. they both attain the same speed
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?
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.
The fluid to which Bernoulli's equation is applied is based on what being conserved for the fluid?
a. its momentum c. its kinetic energy b. its potential energy d. its total mechanical energy