MediumPhysicsHigh School (11–12)Heat & Thermodynamics › Calorimetry and Change of StateNumericalBoard Exam AP A-Level IB

A 150 W heater is put in 0.60 kg of oil…

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A $150\ \text{W}$ heater is put in $0.60\ \text{kg}$ of oil. In $300\ \text{s}$ the oil warms from $20\ ^\circ\text{C}$ to $45\ ^\circ\text{C}$ . Assuming no heat is lost, find the specific heat of the oil.

Need a reminder? The key ideaShow

Heat to warm a body: $Q = mc\,\Delta T$ . Water $4186\ \text{J kg}^{-1}\text{K}^{-1}$ , ice $2100\ \text{J kg}^{-1}\text{K}^{-1}$ , aluminium $900\ \text{J kg}^{-1}\text{K}^{-1}$ , iron $450\ \text{J kg}^{-1}\text{K}^{-1}$ , copper $385\ \text{J kg}^{-1}\text{K}^{-1}$ . Heat capacity of a body $= mc$ .

The worked solution

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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.

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