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CBSE Class 11-science Answered

When a sewing needle is gently placed on the surface of water, it floats. Why?
Asked by Topperlearning User | 01 Aug, 2014, 01:42: PM
answered-by-expert Expert Answer

When the needle is gently placed on the surface of water, it gets slightly depressed. The force due to surface tension on depressed curved surface is inclined upwards, whose resultant is vertically upwards. This resultant balances the weight of the needle. Hence, the needle floats on the surface.

Answered by | 01 Aug, 2014, 03:42: PM
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