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Q.8 A metal ball of radius 0.1 m at a uniform temperature of 90 °C is left in air at 30 °C. The density and the specific heat of the metal are 3000 kg/m³ and 0.4 kJ/kg-K, respectively. The heat transfer coefficient is 50 W/m²-K. Neglecting the temperature gradient inside the ball, The time taken (in hour) for the ball to cool to 60°C is (A) 555 (C) 0.55 (B) 55.5 (D) 0.15

Q.8 A metal ball of radius 0.1 m at a uniform temperature of 90 °C is left in air at 30 °C. The density and the specific heat of the metal are 3000 kg/m³ and 0.4 kJ/kg-K, respectively. The heat transfer coefficient is 50 W/m²-K. Neglecting the temperature gradient inside the ball, The time taken (in hour) for the ball to cool to 60°C is (A) 555 (C) 0.55 (B) 55.5 (D) 0.15

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
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Q.8 A metal ball of radius 0.1 m at a uniform temperature of 90 °C is left in air at 30 °C. The density and the specific heat of the metal are 3000 kg/m³ and 0.4 kJ/kg-K, respectively. The heat transfer coefficient is 50 W/m²-K. Neglecting the temperature gradient inside the ball, The time taken (in hour) for the ball to cool to 60°C is (A) 555 (C) 0.55 (B) 55.5 (D) 0.15
Transcribed Image Text:Q.8 A metal ball of radius 0.1 m at a uniform temperature of 90 °C is left in air at 30 °C. The density and the specific heat of the metal are 3000 kg/m³ and 0.4 kJ/kg-K, respectively. The heat transfer coefficient is 50 W/m²-K. Neglecting the temperature gradient inside the ball, The time taken (in hour) for the ball to cool to 60°C is (A) 555 (C) 0.55 (B) 55.5 (D) 0.15
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