Arod of diameter d=25mm and thermal conductivity k=60w/(m*k) protrudes normally from a furnace wall that is at tw=200°c and is covered by insulation of thickness lins=200mm. the rod is welded to the furnace wall and is used as a hanger to support instrumentation cables. to avoid damaging the cables, the temperature of the rod at its exposed surface, to, must be maintained below a specified operating limit of tmax=100°c. the ambient air temperature is 30°c, and the convection coefficient is 17.0 w/(m2*k). a) derive an expression for the exposed surface

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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  the unit of the measure =

explanation:

  the property that is quantified by the energy needed per of material to raise the temperature by one.

  si unit of energy = joule (j)

  si unit of temperature = kelvin (k)

  si unit of mass of material = kilogram (kg)

the property that is quantified by the energy needed per of material to raise the temperature by one is called specific heat.

the unit of specific heat is

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.