PHYS1110 Investigation 1.pdf

PHYS1110 Investigation 1.pdf - Z5163338 Harsson Vasanthan...

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Z5163338 Harsson Vasanthan 1 PHYS1110 Investigation 1: Using a kettle to measure the specific heat of water Aim The aim of the investigation is to determine the specific heat capacity of water, Cw, by measuring the time taken for the kettle to boil at differing volumes of water Risk Assessment Statement I have read, understood and followed the risk controls recommended for the investigation. Equipment The photograph above showcases the equipment I will be using to conduct the investigation. The three- equipment used in the investigation are: a measuring jug, a smartphone that acts as a stopwatch and an electric kettle that has the power of 2200 Watts. Since I do not have access to a thermometer, I have taken the initial temperature of water to be 25°C which is considered as thermal equilibrium
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Z5163338 Harsson Vasanthan 2 Results Initial temperature of water is assumed as 25°C Volume (L) Mass (kg) Time 1 (s) Time 2 (s) Time 3(s) Average time (s) 0.50 80 82 85 82.3 0.75 114 115 117 115.3 1.00 150 152 155 152.3 1.25 193 198 201 197.3 1.50 251 246 248 248.3 Power of the kettle is 2300 Watts Analysis of Results 1) The uncertainty in the average time is provided below: Uncertainty(s) = ½ * (longest time shortest time) For 0.50L of water, Uncertainty = ½ *(85-80) = 2.5s For 0.75L of water, Uncertainty = ½* (117-114) = 1.5s For 1.00L of water, Uncertainty = ½* (155-150) = 2.5s For 1.25L of water, Uncertainty = ½* (201-193) = 4.0s For 1.50L of water, Uncertainty = ½* (251-248) = 1.5s The increment on the measuring jug was 0.25L therefore uncertainty
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