An object of irregular shape has a characteristic length of 1 m and is maintained at a uniform surface temperature of 375 k. when placed in atmospheric air at a temperature of [infinity] 300 k and moving with a velocity of 100 m/s, the average heat flux from the surface to the air is 20,000 w/m2. if a second object of the same shape, but with a characteristic length of 5 m, is maintained at a surface temperature of 375 k and is placed in atmospheric air at [infinity] 300 k, what will the value of the average convection coefficient be if the air velocity is 20 m/s?