The Student Room Group

physics

the heater is now switched on the power of the eater is 200w the ass of the beaker is 500g it takes 10 minutes to incrase the temperature from 20to 60 degrees calculate the energy
The power is the quotient of energy per time: P = Q/t.

Energy in turn is Q = m * c * dT

m is the mass of the fluid in the beaker (500g), dT the difference of the temperatures (difference of 20 and 60 degrees) and c the specific heat capacity that is unknown and missing. By finding out c, you are able to calculate the energy. And and you can determine the specific heat capacity by using the equation for the energy and put this one in the quotient for the power. The steps to this aren't so hard.
(edited 10 months ago)

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