Define thermoplastic and thermosetting polymers. Give one example of each.

Answer:

Explanation:

Two rings of radius R and nR made of same material have the ratio of moment of inertia about an axis passing through center is 1:8.

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Given: Two rings of radius r and nr

To find: Ratio of their Moment of Inertia

Solution:

The moment of inertia of a ring about an axis perpendicular to the plane and passing through the center is given by: MR².

Here,

M=Mass

R=Radius

Moment of Inertia (MI) of a ring of r radius = Mr²  --------(i)

Moment of Inertia (MI) of a ring of r radius= M(nr)² = Mn²r² -------(ii)

On dividing (i) by (ii)

The ratio comes out to be:

Mr²/ Mn²r² = 1/n²

Lyophilic sols are reversible in nature, which means that they can be disintegrated in their dispersed phase and medium. Lyophobic sols are irreversible in nature, which means that they cannot be disintegrated in their dispersed phase and medium.

The difference between lyophobic sol and lyophilic sol is:-

Lyophobic sol - Substances that do not form colloidal sol when mixed with dispersion medium are called lyophobic sol.

• They are also called "solvent-hating".
• Only specific methods can be used to make these colloidal sols.
• They are irreversible and not much hydrated.
• Examples are oxides, metals and metal sulphides.

Lyophilic sol - Lyophilic sols are liquid-loving colloids in which the disperse phase and the dispersion medium have a strong affinity for each other.

• They are also called "solvent-loving".
• These are reversible sols that can be recovered by adding back the dispersion medium.
• Examples are gum, protein, starch, gelatin, etc. dissolved in water.

Answer:

The Lorentz transformation transforms between two reference frames when one is moving with respect to the other. The Lorentz transformation can be derived as the relationship between the coordinates of a particle in the two inertial frames on the basis of the special theory of relativity.

option (4) is wrong

because 3.21 < 3.222

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