b) Two different capillary tubes of radius 0.5 mm are dipped into soapy water of density 900 kg/m³. The soapy water rises up in straw 1 but drops below the surface in straw 2 as shown in the diagram. If the difference in the two levels is 1.85 cm. The surface tension of the soapy water is 25 mN/m and the angle of contact for straw 1 is 30°. Calculate the angle of contact for straw 2 in degree. [Answer in 2 significant figures]

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Chapter1: Units, Trigonometry. And Vectors
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b)
Two different capillary tubes of radius 0.5 mm are dipped into soapy water of density 900
kg/m³. The soapy water rises up in straw 1 but drops below the surface in straw 2 as shown in the
diagram. If the difference in the two levels is 1.85 cm. The surface tension of the soapy water is 25
mN/m and the angle of contact for straw 1 is 30°. Calculate the angle of contact for straw 2 in
degree. [Answer in 2 significant figures]
#1
#2
1.85 cm
Transcribed Image Text:b) Two different capillary tubes of radius 0.5 mm are dipped into soapy water of density 900 kg/m³. The soapy water rises up in straw 1 but drops below the surface in straw 2 as shown in the diagram. If the difference in the two levels is 1.85 cm. The surface tension of the soapy water is 25 mN/m and the angle of contact for straw 1 is 30°. Calculate the angle of contact for straw 2 in degree. [Answer in 2 significant figures] #1 #2 1.85 cm
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