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

A straight piece of thread, 5.0 cm in length, is placed on the...

A straight piece of thread,

5.0 \text{ cm}

in length, is placed on the surface of water. Determine the force with which the surface on one side of the thread pulls it. The surface tension of water is given as

0.076 \text{ N/m}

Options

A $0.38 \text{ N}$
B $1.52 \text{ N}$
C $0.0076 \text{ N}$
D $0.0038 \text{ N}$

Correct answer

D. $0.0038 \text{ N}$

Step-by-step solution

Length of the thread,

l = 5.0 \text{ cm} = 0.05 \text{ m}

Surface tension of water,

S = 0.076 \text{ N/m}

The force exerted by the surface of water on one side of the thread is given by:

F = S \times l

F = 0.076 \times 0.05 = 0.0038 \text{ N}

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