A foundry worker places a 5.78 kg sheet of cobalt at a temperature of 11°C on top of a 16.6 kg sheet of lead at 63°C. Assuming no heat is lost to the surroundings, calculate the final temperature of the two sheets of metal.

Explanation:

You need the specif heat capacities of both cobalt and lead.

When the two sheets reach the thermal equilibrium their temperatures are equal.

You can use the equations for the thermal heat to find the equilibrium temperature:

Thermal heat released by the hot sheet, lead:

Thermal heat absorbed by the cold sheet, cobalt:

Equal the two equations to solve for T:

I remove the units for easier handling:

Round to 2 significant figures: 35ºC ← answer

the answer would be c

i believe the answer is a.