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Mechanical Properties of Fluids

Surface tension

A disc of paper of radius R has a hole of radius r. It is floa

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A disc of paper of radius $R$ has a hole of radius $r$ . It is floating on the surface of a liquid of surface tension $^{'} T^{'}$ . Then force of surface tension on the disc is:

Name: Video solution 1: A disc of paper of radius R has a hole of radius r. It is floating on the surface of a liquid of surface tension ′T′. Then force of surface tension on the disc is:
Uploaded: 2023-10-18T14:02:13.000Z
Duration: 4 min
Description: Video solution 1: A disc of paper of radius R has a hole of radius r. It is floating on the surface of a liquid of surface tension ′T′. Then force of surface tension on the disc is:

T .2 π R

T .2 π (R - r)

T .2 π (R + r)

T .4 π (R + r)

Views: 5,422 students

Updated on: Oct 18, 2023

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Michael Discussed

A disc of paper of radius

R

has a hole of radius

r

. It is floating on the surface of a liquid of surface tension

^{'} T^{'}

. Then force of surface tension on the disc is:

8 mins ago

Discuss this question LIVE

8 mins ago

Text solutionVerified

Inward force

= - T 2 π r

(consider outward direction of force as positive) outward force

= T 2 π R

Net Force

= - T (2 π r) + T (2 π R)

= 2 π T (R - r)

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Question Text	A disc of paper of radius $R$ has a hole of radius $r$ . It is floating on the surface of a liquid of surface tension $^{'} T^{'}$ . Then force of surface tension on the disc is:
Updated On	Oct 18, 2023
Topic	Mechanical Properties of Fluids
Subject	Physics
Class	Class 11
Answer Type	Text solution:1 Video solution: 2
Upvotes	406
Avg. Video Duration	3 min

A disc of paper of radius $R$ has a hole of radius $r$ . It is floating on the surface of a liquid of surface tension $^{'} T^{'}$ . Then force of surface tension on the disc is:

Text solutionVerified

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A disc of paper of radius R has a hole of radius r. It is floating on the surface of a liquid of surface tension ′T′. Then force of surface tension on the disc is:

Text solutionVerified

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A disc of paper of radius $R$ has a hole of radius $r$ . It is floating on the surface of a liquid of surface tension $^{'} T^{'}$ . Then force of surface tension on the disc is: