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harkovskaia [24]
3 years ago
5

What is a material that restricts the flow of electricity or thermal energy

Physics
3 answers:
Alina [70]3 years ago
7 0

Answer:

Mineral Wool

Explanation:

The mineral wool is a porous material that restricts thermal energy by trapping air in.

anyanavicka [17]3 years ago
4 0

Those materials (there are thousands of them) are called "<em>insulators</em>".

Some examples: glass, paper, most plastics, pure water, most rocks, air

ratt2 years ago
0 0

on edg its an "insulator"

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Dolphin echolocation is similar to ultrasound. Reflected sound waves
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Waves with high frequencies have shorter wavelengths that work better  than low frequency waves for successful echolocation.

Explanation:

To understand why high-frequency waves work better  than low frequency waves for successful echolocation, first we have to understand the relation between frequency and wavelength.

The relation between frequency and wavelength is given by

λ = c/f

Where λ is wavelength, c is the speed of light and f is the frequency.

Since the speed of light is constant, the wavelength and frequency are inversely related.

So that means high frequency waves have shorter wavelengths, which is the very reason for the successful echolocation because waves having shorter wavelength are more likely to reach and hit the target and then reflect back to the dolphin to form an image of the object.

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A 5,000 kg satellite is orbiting the Earth in a circular path. The height of the satellite above the surface of the Earth is 800
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Explanation:

The given data is as follows.

            m = 5000 kg,            h = 800 km = 0.8 \times 10^{6} m

    R_{e} = 6.37 \times 10^{6} m,    r = R + h = 7.17 \times 10^{6} m

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As we know that,

              \frac{mv^{2}}{r} = \frac{GmM_{e}}{r^{2}}

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And, it is known that formula to calculate angular velocity is as follows.

               \omega = \frac{v}{r} = \sqrt{\frac{GM_{e}}{r^{3}}}

                            v = \sqrt{\frac{GM_{e}}{r^{3}}}

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Thus, we can conclude that speed of the satellite is 1.0402 \times 10^{-3} rad/s.

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2 years ago
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