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katen-ka-za [31]
3 years ago
6

On vacation at the beach, you bring a radio to the beach. The radio can pick up several different radio stations.Which is the be

st explanation for this?
A) Sound waves can travel from through the air from the station to your radio.

B) Radio stations broadcast from different locations using their own transmitters.

C) Sound of different pitches are used to transmit information from each radio station. These sound waves can travel over land.

D) Waves are used to transmit the radio signal through the air. These waves are encoded at different frequencies for different stations.
Physics
2 answers:
Harrizon [31]3 years ago
7 0

D) waves are used to transmit the rail signal though the air. these waves are encoded at different frequencies for different stations

Arlecino [84]3 years ago
4 0

Answer:

The correct answer is D.

Explanation:

The radio can pick up several different stations because the waves are used to transmit the radio signal through the air. These waves are coded at different frequencies, assigned to different radios. The waves do not mix, so we can tune several radio stations.    

Have a nice day!

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At a given instant an object has an angular velocity. It also has an angular acceleration due to torques that are present. There
katen-ka-za [31]

a) Constant

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Explanation:

a)

We can answer this question by using the equivalent of Newton's second law of motion of rotational motion, which can be written as:

\tau_{net} = I \alpha (1)

where

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I is the moment of inertia of the object

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The angular acceleration is the rate of change of the angular velocity, so it can be written as

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where

\Delta \omega is the change in angular velocity

\Delta t is the time interval

So we can rewrite eq.(1) as

\tau_{net}=I\frac{\Delta \omega}{\Delta t}

In this problem, we are told that at a given instant, the object has an angular acceleration due to the presence of torques, so there is a non-zero change in angular velocity.

Then, additional torques are applied, so that the net torque suddenly equal to zero, so:

\tau_{net}=0

From the previous equation, this implies that

\Delta \omega =0

Which means that the angular velocity at that instant does not change anymore.

b)

In this second case instead, all the torques are suddenly removed.

This also means that the net torque becomes zero as well:

\tau_{net}=0

Therefore, this means that

\Delta \omega =0

So also in this case, there is no change in angular velocity: this means that the angular velocity of the object will remain constant.

So cases (a) and (b) are basically the same situation, as the net torque is zero in both cases, so the object acts in the same way.

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