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Physics

1 answer:

vazorg [7]3 years ago

4 0

Answer:

1. A solid can diffuse into a liquid, but a solid cannot diffuse into another solid.

3. A liquid can diffuse into another liquid.

4. A gas can diffuse into another gas.

Explanation:

When an object is in liquid or gas form, they can easily move and spread. This is because the molecules are packed loosely. Since they can move freely, diffusion on and into gas/liquid can be easily achieved.

Solid form can diffuse into liquid too. Seawater is mostly made of water and solid salt. But diffusing a solid into a solid is not possible since the molecule is tightly packed and barely moves. The diffusion might be happening, but at a really slow rate that we can assume it is not.

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What is the smallest frequency at which the string can be moved to produce any standing wave?

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In an experiment involving pendulums, you want to see how changing the mass of the bob affects the period (amount of time) of a

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4 identical coins of mass M and radius R are placed in a square, so the center of each coin lies on a corner of the square. The

kati45 [8]

Answer:

I_{total} = 10 M R²

Explanation:

The concept of moment of inertia in rotational motion is equivalent to the concept of inertial mass for linear motion. The moment of inertia is defined

I = ∫ r² dm

For body with high symmetry it is tabulated, in these we can simulate them by a solid disk, with moment of inertia for an axis that stops at its center

I = ½ M R²

As you hear they ask for the moment of energy with respect to an axis parallel to the axis of the disk, we can use the theorem of parallel axes

I = $I_{cm}$ + M D²

Where I_{cm} is the moment of inertia of the disk, M is the total mass of the system and D is the distance from the center of mass to the new axis

Let's apply these considerations to our problem

The moment of inertia of the four discs is

I_{cm} = I

I_{cm} = ½ M R²

For distance D, let's use the Pythagorean Theorem. As they indicate that the coins are touched the length of the square is L = 2R, the distance from any spine to the center of the block is

D² = (R² + R²)

D² = R² 2

Let's calculate the moment of inertia of a disk with respect to the axis that passes through the center of the square

I = ½ M R2 + M R² 2

I = 5/2 M R²

This is the moment of inertia of a disc as we have four discs and the moment of inertia is a scalar is additive, so

$I_{total}$ = 4 I