Awatermelon initially at 35°C s to be cooled by dropping it into a lake at 15 °C. After 4 h and 40 min of cooling, the center temperature of watermelon is measured to be 20°C. Treating the watermelon as a 20-cm-diameter sphere and using the properties k= 0.618 W/m-K, a = 0.15 x 10-6 m2/s, p = 995 ka/m3, and cp= 4.18 kJ/kg'K, determine the average heat transfer coefficient and the surface temperature of watermelon at the end of the cooling period.
Awatermelon initially at 35°C s to be cooled by dropping it into a lake at 15 °C. After 4 h and 40 min of cooling, the center temperature of watermelon is measured to be 20°C. Treating the watermelon as a 20-cm-diameter sphere and using the properties k= 0.618 W/m-K, a = 0.15 x 10-6 m2/s, p = 995 ka/m3, and cp= 4.18 kJ/kg'K, determine the average heat transfer coefficient and the surface temperature of watermelon at the end of the cooling period.
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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Awatermelon initially at 35°C s to be cooled by dropping it into a lake at 15 °C. After 4 h and 40 min of cooling, the center temperature of watermelon is measured to be 20°C. Treating the watermelon as a 20-cm-diameter sphere and using the properties k= 0.618 W/m-K, a = 0.15 x 10-6 m2/s, p = 995 ka/m3, and cp= 4.18 kJ/kg'K, determine the average heat transfer coefficient and the surface temperature of watermelon at the end of the cooling period.
![A watermelon initially at 35°C is to be cooled by dropping it into a lake at 15 °C. After 4 h and 40 min
of cooling, the center temperature of watermelon is measured to be 20°C. Treating the watermelon
as a 20-cm-diameter sphere and using the properties k= 0.618 W/m-K, a = 0.15 x 10-6 m2/s, p= 995
kg/m3, and cp= 4.18 kJ/kg-K, determine the average heat transfer coefficient and the surface
temperature of watermelon at the end of the cooling period.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F35be22dc-c26d-45a3-89f7-dc6516ae2a85%2Ff5ec3c06-0da4-4363-b61d-9ab8ba622184%2Fqydnzd_processed.jpeg&w=3840&q=75)
Transcribed Image Text:A watermelon initially at 35°C is to be cooled by dropping it into a lake at 15 °C. After 4 h and 40 min
of cooling, the center temperature of watermelon is measured to be 20°C. Treating the watermelon
as a 20-cm-diameter sphere and using the properties k= 0.618 W/m-K, a = 0.15 x 10-6 m2/s, p= 995
kg/m3, and cp= 4.18 kJ/kg-K, determine the average heat transfer coefficient and the surface
temperature of watermelon at the end of the cooling period.
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