Question

_______10 POINTS_______
Heat Transfer Topic
Solve this question

​

Answer 1

Newton's law of cooling⇒dT/dt=-k(T-Ts)

⇒-1/k ∫dT/(T-Ts)[limit fromT1 to T2]=∫dt

⇒-1/kln(T2-Ts)/(T1-Ts)=Δt

⇒Δt=1/k ln(T1-Ts)/(T2-Ts)

⇒5s=1/k㏑(50°- Ts)/(45°-Ts) ⇔eq.1,

again 5s=1/k㏑(45°-Ts)/(41.5°-Ts)⇔eq.2

deviding eq.1 by eq.2 and solving you can get

⇒(45-Ts)²=(50°-Ts)(41.5°-Ts)

⇒Ts=33.3°

⇒

Answer 2

Answer:

r u studying in class 11