Question

what happen when cold object is put in calirometer​

Answer 1

Answer:

When a hot object (TH) is placed in thermal contact with a cold object (TC) energy is transferred between the two, but the rate of heat transfer from the hot to the cold is greater, so it cools down while the cold object heats up, until they reach the same temperature (TF).

Answer 2

Answer:

When two bodies at different temperature are kept in contact with each other, then both the bodies finally acquire an equivalent temperature via heat flow.

Also heat flows from hotter body to cooler body and gravity has no effect on the heat flow.