The inner and outer surfaces of a 4-m × 7-m brick wall of thickness 30 cm and thermal conductivity 0.69 w/m-k are maintained at temperatures of 20 °c and 5 °c, respectively. determine the rate of heat transfer through the wall, in w.

Explanation:

As we know that the rate of heat transfer due to temperature difference is given by the formula

here we know that

A = 4 m x 7 m

thickness = 30 cm

temperature difference is given as

now we have

emily ruth's annual premium is $1058.50

step-by-step explanation:

emily ruth is a female of 27 years age purchasing 20 year endowment insurance with face value $25000.

from the given table,

for females, the age of a male 3 years younger should be used.

so, we have to check for 24 year male for 20 year endowment.

it is 42.34 for every $1000 face value.

for a face value of $25000,

it is 25 * 42.34 = $1058.50

∴ emily ruth's annual premium is $1058.50

your answer is, orbit around the nucleus