Question

question 2.
what will happen to the temperatures of objects a and b over time?
a. object a will stay at 80°c and object b will stay at 20°c.
b. object a will cool down to 20°c and object b will remain unchanged.
c. object a will heat up to 100°c and object b will cool down to 0°c.
d. objects a and b will reach the same temperature, which will be between 20°c and 80°c.

Explanation:

When two objects are in contact, heat transfer occurs from the hotter object (Object A at \(80^{\circ}C\)) to the cooler object (Object B at \(20^{\circ}C\)) until thermal equilibrium is reached. Thermal equilibrium means they have the same temperature. Heat transfer will not stop when one object's temperature remains unchanged (eliminating A and B). Also, without an external heat source or sink, Object A won't heat up to \(100^{\circ}C\) and Object B won't cool to \(0^{\circ}C\) (eliminating C).

Answer:

D. Objects A and B will reach the same temperature, which will be between \(20^{\circ}C\) and \(80^{\circ}C\).