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CBSE Class 11-science Answered

Why do the hairs of a shaving brush cling together when taken out of water?
Asked by Topperlearning User | 01 Aug, 2014, 13:27: PM
answered-by-expert Expert Answer

When the brush is taken out of water, the hairs cling together due to surface tension. This happens because the free surface of water tries to acquire a minimum surface area.

Answered by | 01 Aug, 2014, 15:27: PM
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CBSE 11-science - Physics
Applications of Bernoulli's theorem can be seen in :  a. dynamic lift of airplane b. hydraulic press c. helicopter d. none of the above
Asked by vanshraaj.ind | 13 Dec, 2020, 18:06: PM
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CBSE 11-science - Physics
An ancient building has a fine of 5m radius and uniform but small thickness.The surface tension of its masonry structure is about 500Nm^-1.Treated as hemisphere,find the maximum load that dome can support.
Asked by Vidushi412 | 20 Dec, 2018, 12:23: PM
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CBSE 11-science - Physics
Define surface tension.  What is the cause of surface tension?  What is its measure?
Asked by Topperlearning User | 01 Aug, 2014, 13:26: PM
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CBSE 11-science - Physics
Why do the hairs of a shaving brush cling together when taken out of water?
Asked by Topperlearning User | 01 Aug, 2014, 13:27: PM
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CBSE 11-science - Physics
If we place a cotton thread loop on a soap film gently and prick the film within the loop then what shape will the thread loop acquire?
Asked by Topperlearning User | 01 Aug, 2014, 13:32: PM
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CBSE 11-science - Physics
When a sewing needle is gently placed on the surface of water, it floats. Why?
Asked by Topperlearning User | 01 Aug, 2014, 13:42: PM
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CBSE 11-science - Physics
Define surface energy and show that surface energy is equal to surface tension.
Asked by Topperlearning User | 01 Aug, 2014, 14:01: PM
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CBSE 11-science - Physics
n identical drops (each of radius r) of liquid of surface tension T and density coalesce to form single drop.  The energy released in the processes is converted into kinetic energy.  Find the speed of drop.
Asked by Topperlearning User | 01 Aug, 2014, 15:03: PM
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CBSE 11-science - Physics
Derive an expression for excess of pressure inside a soap bubble.
Asked by Topperlearning User | 01 Aug, 2014, 15:43: PM
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CBSE 11-science - Physics
What happens if the capillary tube is of insufficient height?
Asked by Topperlearning User | 01 Aug, 2014, 15:46: PM
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