A 4 pole, 460v motor is supplying its rated power to a centrifugal load at a 60hz frequency. Its rated speed is 1746rpm. calculate its speed, slip frequency and slip when it's supplied by 230V,30hz source​

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.