Along, uninsulated steam line with a diameter of 100 mm and a surface emissivity of 0.8 transports steam at 150°c and is exposed to atmospheric air and large surroundings at an equivalent temperature of 20°c. (a) calculate the rate of heat loss per unit length for a calm day. (b) calculate the rate of heat loss on a breezy day when the wind speed is 8 m/s. (c) for the conditions of part (a), calculate the rate of heat loss with a 20-mm-thick layer of insulation (k = 0.08 w/m ⋅ k). would the heat loss change significantly with an appreciable wind speed?

hello, i am papaguy.

i have found an answer to your question but use it as information.

information: because weak acids/bases have low concentration of hydrogen ions, the addition of water has a large impact on the ph. 2. a difference in 1 unit is a 10x difference in concentration for example; a liquid with ph of 3 is 10x more acidic than a liquid with a ph of 4. therefore, a liquid with a ph of 3 is stronger.

best of luck!

option number c is the right answer.

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.