# physics test

Jun 17th, 2015
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1. A student conducts an experiment to investigate the relationship between the mass of a certain liquid that is boiled and the amount of heat used. The student uses a stopwatch to measure the time taken, t. The result of the experiment is shown in the graph of m against t shown in Diagram below.

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1.A student conducts an experiment to investigate the relationship between the mass of a certain liquid that isboiled and the amount of heat used. The student uses a stopwatch to measure the time taken, t. The result ofthe experiment is shown in the graph of m against t shown in Diagram below.Diagram (a)The initial mass, m0of the liquid can be determined from the m-axis. Show on the graph how you woulddetermine m0and state its value.m0__________________________________[2 marks/markah](b)State the relationship betweenmandt...[1 mark/markah](c)The specific latent heat of vaporisation, L, of the liquid is given by the equation:where k is the gradient of the graph..(i)Calculate the gradient of the graph of m against t. Show on the graph how you would determine thegradient.[3 marks/markah](ii)Calculate the specific latent heat of vaporization, L, of the liquid.[2 marks/markah](d)Determine the mass, m, of the liquid that is lost if the time taken for heating is 20 minutes. Show on thegraph how you would determine the value of m.[3 marks/markah](e)Stateoneprecaution that should be taken when the experiment is carried out.[1 mark/

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