00:01
In this problem, you immerse a heating unit with a power of 65 watt in 0 .78 kilogram of some unknown material, of some material of a material of unknown heat capacity, and you want to find the heat capacity of this material.
00:20
So after you, so after 120 seconds of heating, then the temperature of the material raises from, 18 .55 to 22 .5, 4 degrees celsius.
00:36
And so we can, from the power and the time and the amount of time that the material is heated up, then we can find the amount of heat transfer to the material.
00:50
So heat transfer to the material is power times time.
00:56
And this is equal to 65 fuel per second times 120 seconds and this is equal to 80 hundred fuels.
01:12
So assuming that there's no heat transfer to the to the container then all of this heat will go to heat up the material of interest.
01:22
So we can use q equals to n times c times delta t and this is equal to m the mass is 0 .78 kilograms times dlt which is equal to 3 .99 gv celsius times the heat capacity and this should be equal to the amount of heat that we just calculated here 700 joules.
01:52
We divide both sides by this number...