1 In the experiment shown in Figure 1,0.024 kg of water was collected in the beaker in 300 s with the heater turned off. The beaker was
then emptied and placed under the funnel again. With the heater
on for exactly 300 s, the joulemeter reading increased from zero to
15 000 J, and 0.068 kg of water was collected in the beaker.
a Calculate the mass of ice melted because of the
heater being on.
[1 mark]
b Use the data to calculate the specific latent heat of
fusion of water.
[2 marks]
2
ㄹ
4 Estimate how long a 3000 W electric kettle would take to