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Please solve quickly and show all your work, I will upvote immediately. Thank you An L...

Please solve quickly and show all your work, I will upvote immediately. Thank you

An L = 300-mm-long solid steel rod of diameter, D = 13 mm and having k = 13.4 W/m∙K is exposed to a convection coefficient of h=30 Wm^2*K. Find out whether the lumped capacitance approximation is valid?

Engineering   Mechanical-Engineering   
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