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3 years ago

Can an electrical fan make thermal energy

Physics

1 answer:

Nastasia [14]3 years ago

3 0

No only uses electric energy and kinetic energy

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What is the frequency of a wave if the speed of the wave is 7.9m/s and the wavelength is 3.1m?

Tpy6a [65]

Answer:

Explanation:

The frequency of the wave given it's velocity and wavelength can be found by using the formula

$f = \frac{c}{ \lambda} \\$

where

c is the velocity of the wave in m/s

$\lambda$ is the wavelength in m

From the question

c = 7.9 m/s

$\lambda$ = 3.1 m

We have

$f = \frac{7.9}{3.1} = 2.548387... \\$

We have the final answer as

Hope this helps you

6 0

3 years ago

The natural resistance of any object to change its speed is called _____.

Stella [2.4K]

This natural resistance is known as inertia. =)

6 0

3 years ago

NASA is giving serious consideration to the concept of solar sailing. A solar sailcraft uses a large, low mass sail and the ener

Stella [2.4K]

Answer:

Reflective

Explanation:

The radiation pressure of the wave that totally absorbed is given by;

$P_{abs}= \frac{I}{C}$

and While the radiation pressure of the wave totally reflected is given by;

$P_{ref}= \frac{2I}{C}$

Now compare the two-equation you can clearly see that the pressure due to reflection is larger than absorption therefore the sail should be reflective.

6 0

3 years ago

In certain ranges of a piano keyboard, more than one string istuned to the same note to provide extra loudness. For example, the

steposvetlana [31]

Answer:

The beat frequency is 5.5 Hz.

Explanation:

f = 110 Hz, T = 600 N , T' = 540 N

let the frequency is f'.

$\frac{f'}{f}=\sqrt\frac{T'}{T}\\\\\frac{f'}{f}=\sqrt\frac{540}{600}\\\\\frac{f'}{f}=0.95\\\\f'= 104.5 Hz$

So, the beat frequency is f - f' = 110 - 104.5 = 5.5 Hz

6 0

3 years ago

Why is si unit called coherent system

Sladkaya [172]

Answer:

The SI system is also called coherent system of units because of the following reasons: ... 1 Newton (SI unit of Force) = 1 Kg (SI unit of mass) x 1 m (SI unit of distance) / s2 (SI unit of time) , therefore 1 Newton is a coherent unit of Force.

HOPE ITS HELP

6 0

3 years ago