Look up the specific heat of sand. Call it C.
http://apollo.lsc.vsc.edu/classes/met130/notes/chapter2/spec_heats.html
has some values
The thermal energy increase is
deltaU = Q = M*C*(deltaT)
where deltaT = 80 C
calculate the change in thermal energy when 120kg of sand warms from 10 degrees celcius to 90 degrees celcius
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