Energy flows by radiation or convection inside stars but almost never by conduction
Indicate whether the statement is true or false
T
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Show that the rate of heat conduction per unit length through a long hollow cylinder of inner radius ri and outer radius ro, made of a material whose thermal conductivity varies linearly with temperature, is given by
GIVEN
• A long hollow cylinder
• The thermal conductivity varies linearly with temperature
• Inner radius = ri
• Outer radius = ro FIND
• Show that the rate of heat conduction per unit length is given by the above equation ASSUMPTIONS
• Conduction occurs in the radial direction only
• Steady state prevails
SKETCH
A car weighing 5000 N is traveling along a straight level road powered by a forward drive force of 500 N. The force of air resistance is 200 N, and rolling resistance is 100 N. The car's acceleration is
A) in the backward direction. B) in a direction that is sideways to the car. C) in the downward direction. D) zero. E) in the forward direction.
A slit of width 2.0 ?m is used in a single slit experiment with light of wavelength 650 nm. If the intensity at the central maximum is Io, what is the intensity 10° from the center?
A) 0.53 Io B) 0.03 Io C) 0.43 Io D) 0.50 Io E) 0.35 Io
The water flowing over Niagara Falls drops a distance of 50. m. Assuming that all the gravitational energy is converted to thermal energy, by what temperature does the water rise?
What will be an ideal response?