Moment of Inertia of a Thin Plate

This video explains to find mass moment of inertia for semi-circular thin plate. Find the moment of inertia about the x-axis of a thin plate bounded by the curve x y.


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So were told that a thin plate of constant density covers a region bounded by an ellipse next by plane and we were asked to find the first moment of plate about the origin so as a suggestion the hint to complete this problem.

. Find the value of x. Determine the mass moment of inertia of the thin plate about an axis perpendicular to the page and passing through point O. 2y - y2 2y.

The mass moment of inertia of a thin ring of mass m and. The radius of gyration of the pendulum about an axis perpendicular to the screen and passing through point G. Let I be the moment of inertia of a square plate IIT JEE 1998 A thin wire of length L and uniform linear mass density IIT JEE 2000 One quarter section is cut from a uniform circular disc IIT JEE 2001 A solid sphere of radius R melted to a disc IIT JEE 2006 Four solid spheres each of diameter IIT JEE.

Now we will find the mass moment of inertia of the elemental strip about the x-axis. Determine the mass moment of inertia of the thin plate about an. I plate 1 6 M L 2.

I y 2 dM. We can define the mass per unit area to be Now to figure out the moment of inertia of this complex structure I just consider one piece at a time. 2y 0 y.

Iz Sa. Determine the MMI of the pendulum using the method for composite bodies. The moment of inertia of thin uniform rectangular plate relative to the axis passing perpendicular to the plane of the plate through one of its vertices if the sides of the plate are equal to a and b and mass m is I m x a 2 b 2.

A thin rectangular plate rotating on an axis thats perpendicular to the center of the plate with mass M and side lengths a and b has a moment of inertia determined by the formula. 020220 08kg The moment of inertia of the plate about an axis perpendicular to the page and passing through point O for each segment. Mass of the elemental section.

I ρ b dy ty 2. The pendulum consists of a 5 kg plate and a 3 kg slender rod. Case of a rotation about the perpendicular central axis at center of the plate z-axis on above diagram I z 1 12 m h2 w2 I z 1 12 m h 2 w 2 Case of a rotation about on of the two symmetry axis on the.

You might not be aware but there is a trick for finding a Moment of Inertia. Calculate the moment of inertia of a thin plate in the shape of a right triangle about an axis that passes through one end of the hypotenuse and is parallel to the opposite leg of the triangle as in Figure P1028a. Let me pick one thin little rod a distance x from the axis and of width dx.

11 rows Therefore the moment of inertia of a uniform circular plate about its axis I MR 2 2. Consider a thin homogeneous plate with a principal momenta of inertia. 2 k g is 0.

Mass of the rectangular body density x volume. Determine the radius of gyration ky. Civil Engineering questions and answers.

If its density at the point xy is 8x y y 1 Solution. Here are the formulas to calculate the mass moment of inertia of a thin rectangular plate about different axis. 11 00 To find points of intersections.

And x 2y - y. 02 x y. Then determine the.

About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy Safety How YouTube works Test new features Press Copyright Contact us Creators. Determine the moment of inertia of the thin plate about an axis perpendicular to the page and passing through the pin at O. DM ρ x btdy.

4 rows Moment of inertia depends on the shape of the body and may be different around different axes of. Equation of the moment inertia becomes. The moment of inertia of a thin circular disc about an axis passing through its centre and perpendicular to its plane is 1Then the moment of inertia of the disc about an axis parallel to its diameter and touching the edge of the rim is.

I 3 I 1 I 2. The plate has a hole in its center. M ρ x bdt.

Let M represent the mass of the triangle and L the length of the base of the triangle perpendicular to the axis of rotation. Its thickness is 50 mm and the material has a density of rho 50 kgm3. Find Moment of Inertia of a Square Plate along an Axis.

Let us determine the MOI of a square plate crossing through its centre and perpendicular. The moment of inertia of a thin square plate of mass 1. Let its thickness be dy and s be the mass per unit volume of the plate.

The material has a mass per unit area of 20kgm2. The side length of plate is. Let the origins of the x i x i systems coincide and be located at the center of mass O about an axis inclined at an angle a from the plane of the plate and perpendicular to the x 2 axis.

More Problems on Moment of Inertia. Y 0 yy - 1 0 y 0 then x 0 y 1 then x 1 Now to find moment of inertia. Lets call the total mass of this entire rectangular plate M.

It has surface area A L x L L 2. M 0 2π ρRθ d 2πρRρ m 2πR Iz m 2πR0 2π RRθ 2 dmR 2 Iz mR 2 Problem 17-3 The solid is formed by revolving the shaded area around the yaxis. X 2y y.

Determine the moment of inertia of the thin ring about the zaxis. I 112 M a 2 b 2. I1 along the principal axis x1 I 2 I 1 along the principal axis x2.

2 k g m 2 when it is made to rotate about an axis perpendicular to plane of plate and passing through a corner of plate. 2 2 x 222 I y dA y d dA y dA y dA d dA c cc ³³ ³ ³ ³. The specific weight of the material is γ.

In this exercise Recalculates the polar moment of inertia of an elliptical plane please. Since the thickness t is much smaller than the plate dimension the mass and the elemental mass of the thin plate can be expressed in terms of the thickness and the material density if the reference axis lies in the middle plane of the plate the mass moment of inertia of the thin plate with respect to an axis can be expressed as the elemental area on the middle plane with the. The ring has a mass m.


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