Some aerodynamic exercises. I am in 3rd year of Aerospacial Engineering.
Can anyone help me? I am studying from home and I have been struggling with this. Thanks!
Son ejercicios de aerodinámica del 3 año de Ingeniería aeroespacial.
Puede alguien ayudarme? Con esta situación me cuesta estudiar y entender el temario. Gracias!

Apipe with an outside diameter of 15 cm is exposed to an ambient air and surrounding temperature of -20°c. the pipe has an outer surface temperature of 65°c and an emissivity of 0.85. if the rate of heat loss from the pipe surface is 0.95 kw per meter of length, the external convective heat transfer coefficient (h) is: (a) 12.5 w/m"k (b) 18.6 w/mk (c) 23.7 w/mk (d) 27.9 w/mk (e) 33.5 w/mk

Water at 55c flows across a flat plate whose surface temperature is held constant at 95c. if the temperature gradient at the plate's surface for a given value of x is 18 c/mm, find a) local heat transfer coefficient. b) heat flux

For a gate width of 2 m into the paper, determine the force required to hold the gate abc at its location.