Question

Object A at 40ºC and object B at 80ºC are placed in contact with each other. Which statement describes the heat flow between the objects?

A) Heat flows from object A to object B.

B) Heat flows from object  B  to object A. C)Heat flows in both directions between the objects. D) No heat flow occurs between the objects.

Answer 1

Option B is right that is Heat flows from object B to object because if 2 bodies have different temperature so heat always transfer from higher to lower ,from hot to cold .

Answer 2

By the second law of thermodynamics:
Heat can not spontaneously flow from cold regions to hot regions without external work being performed on a system.
Heat transfer is the passage of thermal energy from a hot ( t B = 80° C ) to a colder body ( t A = 40° C ).
Answer: B ) Heat flows from object B to object A.