Which releases more energy, 100 grams of 100c water cooling to 50c, or 100 grams of iron at 100c cooling to 50c

Lets say that an object of a certain volume has a certin mass. what happens to its mass when you double its volume?

Unpolarized light of intensity i_0=750w/m^2 is incident upon two polarizers. after passing through both polarizers the intensity is i_2=280w/m^2. (a) what is the intensity of the light after it passes through the first polarizer in w/m^2? (b) write an equation for the angle between the polarizers in terms of the initial (i_0) and final (i_2) intensities. (c) find the angle between the polarizers in degrees.

What is a possible result of higher air temperature caused by global warming