How much heat will be absorbed by a 63.1 g piece of aluminum (specific heat = 0.930 J/g･°C) as it changes temperature from 23.0°C to 67.0°C?

Explanation:

Hello,

In this case, for us to compute the absorbed heat, we apply the following equation:

Whereas we use the mass, specific heat and temperature change for the piece of aluminium, thus, we obtain:

It is positive as the heat is entering, therefore the temperature raises.

Best regards.

d: the voltage of the secondary coil is less than that of the primary coil.

im not suree sorry if wrong

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)