Heat and temperature

1. How much heat is required to raise the temperature by 10 degrees Celsius of one kg of water and iron?

2. Two identical objects (the same mass, material) at temperatures T1 = 20 degrees and T2 = 30 degrees are in contact. What is the final temperature of these objects after they reach thermal equilibrium?

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... Celsius
specific heat capacity of iron = 0.108 calorie/ gm / deg Celsius= 0.45 Joules/ gm/ deg Celsius

One kg= 1000 gm

Heat required for water= 1000 X 4.2 X 10= 42,000 Joules= 42 k J
Heat required for iron= 1000 X 0.45 X 10= 4,500 Joules= ...