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Concepts Of Physics MCQ Edition [Volume 1]
Exam
Concepts Of Physics MCQ Edition [Volume 1]
Subject
Physics
Chapter
Some Mechanical Properties of Matter

Concepts Of Physics MCQ Edition [Volume 1] · Physics · Some Mechanical Properties of Matter

Consider an ice cube of edge 1.0 cm placed in a gravity-free hall....

Consider an ice cube of edge 1.0 cm1.0 \text{ cm} placed in a gravity-free hall. Determine the surface area of the water after the ice melts. Ignore the difference in densities between ice and water.

Options

  1. A(36π)1/3 cm2(36\pi)^{1/3} \text{ cm}^2
  2. B361/3 cm236^{1/3} \text{ cm}^2
  3. C(4π)1/3 cm2(4\pi)^{1/3} \text{ cm}^2
  4. D6.0 cm26.0 \text{ cm}^2

Correct answer

A. (36π)1/3 cm2(36\pi)^{1/3} \text{ cm}^2

Step-by-step solution

Volume of the ice cube is V=a3=(1.0)3=1.0 cm3V = a^3 = (1.0)^3 = 1.0 \text{ cm}^3.

Since the difference in densities is ignored, the volume of water formed is also V=1.0 cm3V = 1.0 \text{ cm}^3.

In a gravity-free space, the liquid takes a spherical shape to minimize its surface area due to surface tension.

Let the radius of the spherical water drop be RR. Equating the volumes:

43πR3=1\dfrac{4}{3}\pi R^3 = 1

R=(34π)1/3R = \left(\dfrac{3}{4\pi}\right)^{1/3}

The surface area of the spherical drop is given by A=4πR2A = 4\pi R^2.

A=4π(34π)2/3A = 4\pi \left(\dfrac{3}{4\pi}\right)^{2/3}

A=(4π)1−2/3(32)1/3A = (4\pi)^{1 - 2/3} (3^2)^{1/3}

A=(4π)1/3(9)1/3=(36π)1/3 cm2A = (4\pi)^{1/3} (9)^{1/3} = (36\pi)^{1/3} \text{ cm}^2
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