Consider a refrigerator that consumes 320 W of electric power when it is running. If the refrigerator runs only one quarterof the time and the unit cost of electricity is $0.09/kWh, the electricity cost of this refrigerator per month (30 days) is(a) $3.56 (b) 55.18 (a 53.54 {0159.26 [6) $20.74

Air flows over a heated plate àt a velocity of 50m/s. the local skin factor coefficient at a point on a plate is 0.004. estimate the local heat transfer coefficient at this point.the following property data for air are given: density = 0.88kg/m3 , viscosity 2.286 x 10 ^-5 kgm/s , k = 0.035w/mk ,cp = 1.001kj/kgk. use colburn reynolds analogy.