4. An aluminum sphere is heated to 300 °C and then placed in an air stream at 20°C and 1 atm pressure. Determine the time for the average sphere temperature to drop to 50°C for velocities of air of a) 0.1 m/s and b) 0.5 m/s. You can use information from class notes to solve this quickly, but you should justify use of any formulae used.
4. An aluminum sphere is heated to 300 °C and then placed in an air stream at 20°C and 1 atm pressure. Determine the time for the average sphere temperature to drop to 50°C for velocities of air of a) 0.1 m/s and b) 0.5 m/s. You can use information from class notes to solve this quickly, but you should justify use of any formulae used.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Parvinbhai
Transcribed Image Text:4. An aluminum sphere is heated to 300 °C and then placed in an air stream at 20°C
and 1 atm pressure. Determine the time for the average sphere temperature to
drop to 50°C for velocities of air of a) 0.1 m/s and b) 0.5 m/s. You can use
information from class notes to solve this quickly, but you should justify use of
any formulae used.
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