Citrus fruits are very susceptible to cold weather, and extended ex posure to subfreezing temperatures can destroy them. Consider an 8-cm- diameter orange that is initially at 158C. A cold front moves in one night, and the ambient temperature suddenly drops to 268C, with a heat transfer coefficient of 15 W/m²·K. Using the properties of water for the orange and assuming the ambient conditions to remain constant for 4 h before the cold front moves out, determine if any part of the orange will freeze that night. Solve this problem using analytical one-term approximation method (not the Heisler charts).