Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app

JEE Main 20244 AprilMorning Shift

Exam: JEE Main
Year: 2024
Date: 4 April
Shift: Morning Shift
Subject: Physics
Chapter: Mechanical Properties of Fluids

JEE Main 2024 · 4 April · Morning Shift · Physics · Mechanical Properties of Fluids

A soap bubble is blown to a diameter of 7 ~cm .36960 erg of work is...

A soap bubble is blown to a diameter of

7 \mathrm{~cm} .36960 \mathrm{erg}

of work is done in blowing it further. If surface tension of soap solution is

40 \mathrm{dyne} / \mathrm{cm}

then the new radius is______

\mathrm{cm}

Take

\left(\pi=\frac{22}{7}\right)

Correct answer

0

Step-by-step solution

\begin{aligned} & \omega=\Delta \mathrm{U}=\mathrm{S} \Delta \mathrm{A} \\ & 36960 \mathrm{erg}=\frac{40 \text{ dyne }}{\mathrm{cm}} 8 \pi\left[(\mathrm{r})^2-\left(\frac{7}{2}\right)^2\right] \mathrm{cm}^2 \\ & \mathrm{r}=7 \mathrm{ cm}\end{aligned}

Practice Mechanical Properties of Fluids on Quantrex Academy →

More from Mechanical Properties of Fluids

Passage: A container of height 2 m, length 2 m and breadth 1 m is made of insulating… JEE Advanced 2026 A liquid of density 600 kg/m ^3 flowing steadily in a tube of varying cross-section. The… JEE Main 2026 A spherical liquid drop of radius R acquires the terminal velocity v_1 when falls through… JEE Main 2026 A cylindrical vessel of 40 cm radius is completely filled with water and its capacity is… JEE Main 2026 Eight mercury drops, each of radius r , coalesce to form a bigger drop. The surface… JEE Main 2026 A water spray gun is attached to a hose of cross sectional area 30 cm ^2 . The gun… JEE Main 2026 The surface tension of a soap solution is 3.5 × 10^ -2 N/m. The work required to increase… JEE Main 2026 The surface tension of a soap bubble is 0.03 N/m. The work done in increasing the… JEE Main 2026 Full Mechanical Properties of Fluids list All JEE Main PYQs