How much energy, in joules, is released when 17 kilograms of granite is cooled from 45°c to 21°c?

a. 327,992.8 j
b. 365,575.3 j
c. 901,980.3 j
d. 785,662.8 j

Energy or heat can be calculated in terms of the mass, temperature, and specific heat of a substance. This is given by the equation:

U = mCpΔT = mCp(Tf-Ti)

where:
m = mass
Cp = specific heat
ΔT = temperature difference

For this problem, you need to get the specific heat of granite which can be found in reliable chemistry/engineering books or websites. According to Engineering Toolbox website, the Cp of granite is 790 J/(kg-°C).

U = 17 kg (790 J/(kg-°C)) (21-45) = - 322,320 Joules

*Note: the sign is negative because energy was released

It's either -limiting factors or -scarce resources but i'd go with my first answer since the food and water are abundant they really aren't scarce

We are not able to see the stars. light prevents our seeing the stars. i hope it kinda : )