The temperature of a flowing gas is to be measured with a thermocouple junction and wire stretched between two legs of a sting, a wind tunnel test fixture. the junction is formed by butt-welding two wires of different material, as shown in the schematic. for wires of diameter 525 μm and a convection coefficient of 700 w/m2·k, determine the minimum separation distance between the two legs of the sting, , to ensure that the sting temperature does not influence the junction temperature and, in turn, invalidate the gas temperature measurement. consider two different types of thermocouple junctions consisting of (a) copper and constantan wires and (b) chromel and alumel wires. evaluate the thermal conductivity of copper and constantan at 300 k. use 19 w/m·k and 29 w/m·k for the thermal conductivities of the chromel and alumel wires, respectively.

do you have a formula possibly

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.

distance = 150m

displ = root (50 ^2 + 100^2)

root(2500+10000)

root 125000

electrical potential energy =0.072 j

explanation:

electrical potential energy is given by

u= q δv

q= charge=6 c

δv= potential difference and is given by

δv= e d

e= electric field

d= distance=5 mm=0.005 m

δv=2.4 (0.005)=0.012 v

now electric potential energy= u= q δv

u=6 (0.012)

u=0.072 j