A laser beam with a constant optical power of 35 W is used to heat a sample of ethanol inside a quartz cell. The mass of the ethanol is 150 g. The laser is active for a duration of 6.0 minutes6.0\text{ minutes}6.0 minutes, during which the temperature of the ethanol increases from 15.0∘C15.0^\circ\text{C}15.0∘C to 42.0∘C42.0^\circ\text{C}42.0∘C.
Calculate the total thermal energy transferred from the ethanol to the quartz cell and the surroundings during this heating process.
(Specific heat capacity of ethanol = 2400 J kg-1 K-1)
56 exam-style questions on OCR A A Level Physics Thermal physics, covering Temperature, Solid, liquid and gas, Thermal properties of materials, and Ideal gases. Each one has a worked solution and a mark scheme showing where the marks go.