Chapter 5: Q26P (page 257)

In Problems 17 to 30, for the curve $y = \sqrt{x}$ , between $x = 0$ $x = 2$ and, find:
The moments of inertia of a wire bent along the arc of the curve.

Short Answer

Expert verified

The moments of inertia of a wire bent along the arc of the curve is $\frac{2}{3} M$ .

Step by step solution

Definition of Moment of inertia of circular ring

The moment of inertia of a circular ring along an axis perpendicular to its plane and passing through its center is given as follows,

$l = {Mr}^{2} = (2 πrλ) r^{2}$

Here, $λ$ is the mass per unit length.

Determination of inertia along an axis perpendicular to its plane

Determine the value of moment of inertia of circular lamina by taking the sum of the rings.

$l = \int_{0}^{R} r^{2} (2 πrδdr) = 2 πδ \int_{0}^{R} r^{3} dr = \frac{π}{2} {δR}^{4} = \frac{{MR}^{4}}{2}$

Here, $δ$ is mass per unit area and the value of mass is $M = δ R^{2} π$ .

Determination of moment of inertia

Find the value of $d l$ and $d M$ .

$d l = \frac{d M {(f (x))}^{2}}{2} d M = p d x {(f (x))}^{2} π$

Take sum of the moment of inertia.

$l = \int_{0}^{2} \frac{1}{2} p π {(f (x))}^{2} dx = \frac{p π}{6} x^{3} = {\frac{p π}{6} x^{3}}_{0}^{2} = \frac{4}{3} p π$

Write the expression for the mass of the volume.

$M = V p = 2 πp$

Thus, the moment of inertia of a wire bent along the arc of the curve is $\frac{2}{3} M$ .

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In Problems 17 to 30, for the curve $y = \sqrt{x}$ , between $x = 0$ $x = 2$ and, find:
The moments of inertia of a wire bent along the arc of the curve.

Short Answer

Step by step solution

Definition of Moment of inertia of circular ring

Determination of inertia along an axis perpendicular to its plane

Determination of moment of inertia

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Physics Textbooks

Work Energy and Power

Famous Physicists

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Study anywhere. Anytime. Across all devices.

In Problems 17 to 30, for the curve y=x, between x=0x=2and, find:The moments of inertia of a wire bent along the arc of the curve.

Short Answer

Step by step solution

Definition of Moment of inertia of circular ring

Determination of inertia along an axis perpendicular to its plane

Determination of moment of inertia

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Physics Textbooks

Work Energy and Power

Famous Physicists

Rotational Dynamics

Radiation

Mechanics and Materials

Electricity

Study anywhere. Anytime. Across all devices.

In Problems 17 to 30, for the curve $y = \sqrt{x}$ , between $x = 0$ $x = 2$ and, find:
The moments of inertia of a wire bent along the arc of the curve.