A boy has three buckets as shown below. He puts his right hand in bucket A and left hand in bucket B. He then puts both of his hands in normal water. His right hand feels that the water here is hotter, while his left hand feels that the water here is colder. Based on the above observation, compare the temperatures of water in buckets A and B. $[5 marks]$

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Solution

We know that heat flows from a hot body to a cold body.
$[1 mark]$
Boy's right hand felt hotter after dipping in normal water. This means that the water in the normal bucket is at a temperature that is higher than that of bucket A.
$[1 mark]$
Similarly, we can conclude that the water in the normal bucket is at a temperature lower than that of water in bucket B because his left hand felt colder here.
$[1 mark]$
The temperature of the buckets in the increasing order is:
Bucket A < Normal bucket < Bucket B.
Therefore, bucket A has cold water, whereas bucket B has hot water compared to the water in the normal bucket.
$[2 marks]$

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