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Answers
Answer:
Solution
Radius of the expanded bubble is 7 cm
Given
Initial Diameter (D) = 7 cm
Initial Radius (R) = 7/2 cm
Work Done (W) = 36960 Ergs
Surface Tension (S) = 40 Dyne/cm
To finD
New Radius of the Bubble
Let r be the new radius of the bubble
Using the Relation,
\boxed{\boxed{\sf Work \ Done = Surface \ Tension \times Increase \ In \ Surface \ Area }}
Work Done=Surface Tension×Increase In Surface Area
Substituting the values,
\begin{gathered} \tt \: 36960 = 40 \times \bigg(4\pi {r}^{2} - 4\pi( { \dfrac{7}{2}) }^{2} \bigg) \times 2 \\ \\ \longrightarrow \: \tt \: 462 = 4\pi( {r}^{2} - \dfrac{49}{4} ) \\ \\ \longrightarrow \: \tt \: {r}^{2} - \dfrac{49}{4} = \dfrac{21 \times 7}{4} \\ \\ \longrightarrow \: \tt \: { r }^{2} = 49 \\ \\ \\ \longrightarrow \: \boxed{ \boxed{ \tt \: r = 7 \: cm}}\end{gathered}
36960=40×(4πr
2
−4π(
2
7
)
2
)×2
⟶462=4π(r
2
−
4
49
)
⟶r
2
−
4
49
=
4
21×7
⟶r
2
=49
⟶
r=7cm
Answer:
Types of Orchids - Just To Hit You with Beautiful Blooms
Phalaenopsis Orchids. The Phalaenopsis Orchids are also known as Moth Orchids. ...
Cattleya Orchids. Cattleya Orchids are mostly used in corsages around the world. ...
Brassavola Orchids. ...
Cymbidium Orchid. ...
Epidendrum Orchids. ...
Dendrobium Orchids. ...
Catasetum Orchids. ...
Cycnoches Orchids.
Explanation: