3 years ago

Radio stations broadcast signals on two different frequency bands. These are called

Physics

1 answer:

Anuta_ua [19.1K]3 years ago

7 0

Answer:

AM(amplitude modulation) and FM(frequency modulation)

Explanation:

A radio frequency band is a small adjacent section of the radio spectrum frequencies, whereby channels are usually used or set aside to be used.

They are usually of two different bands called AM which is known as amplitude modulation and FM which is known as frequency modulation

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16. A train has 6000) of kinetic energy. It is traveling at 40 m/s. What is the mass of the train?

Elden [556K]

Answer:

Explanation:

The mass of the train can be found by using the formula

$m = \frac{2k}{ {v}^{2} } \\$

k is the kinetic energy

v is the velocity

From the question we have

$m = \frac{2(6000)}{ {40}^{2} } = \frac{12000}{1600} = \frac{120}{16} = \frac{15}{2} \\$

We have the final answer as

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3 years ago

19. Which of the following characteristics is independent of sample size?

Temka [501]

Answer:

Heat content

Explanation:

Heat doesnt need an object to be large or small, for example a lump of coal is hotter and smaller than a big piece of brick.

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3 years ago

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A 2.0 kilogram rifle initially at rest fires a 0.002 kilogram bullet. As the bullet leaves the rifle with a velocity of 500 mete

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Answer:

1001

Explanation:

M=2.0+0.002=2.002kg

V=500m/s

p=?

p=M×V

p=2.002×500

p=1001

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4 years ago

Light waves A) do not require a medium. B) can not travel in a vacuum. C) are not electromagnetic radiation. D) do not travel in

avanturin [10]

Light waves a) do not require a medium

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3 years ago

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What is the efficiency of an engine that does 80 j of work and exhausts 320 j of heat while taking in 400 j of heat ?

Luden [163]

Answer:

b. 20%

Explanation:

Efficiency of an engine is a ratio in percentage of the work done to the energy intake of the engine.

η=(Q₁-Q₂)/Q₁×100%

η is efficiency, Q₁ is the energy intake, Q₂ is energy wasted.

The information provided is:

Energy intake = 400 J

Work done = 80 J = (400-320) =Q₁-Q₂

Energy wasted =320 J

η= 80/400×100%

=20%

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3 years ago

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