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Harrizon [31]
4 years ago
15

What happens when a blaring siren moves away from you

Physics
1 answer:
Anit [1.1K]4 years ago
4 0
It gets quieter as the sound waves have to travel further and so the volume decreases
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A 54 kg pole vaulter running at 10 m/s vaults over the bar. Her speed when she is above the bar is 1.3 m/s. The acceleration of
Marizza181 [45]

Answer:

h_{B} = 5.012\, m

Explanation:

It is assumed that pole vaulter began running at a height of zero. The physical model is formed after the Principle of Energy Conservation:

K_{A} = K_{B} + U_{B}

\frac{1}{2} \cdot m \cdot v_{A}^{2} = \frac{1}{2} \cdot m \cdot v_{B}^{2} + m \cdot g \cdot h_{B}

The previous expression is simplified and required height is found:

h_{B} = \frac{1}{2\cdot g} \cdot (v_{A}^{2}-v_{B}^{2})

h_{B} = \frac{1}{2 \cdot (9.807\, \frac{m}{s^{2}} )} \cdot [(10\, \frac{m}{s} )^{2}-(1.3\, \frac{m}{s} )^{2}]

h_{B} = 5.012\, m

5 0
4 years ago
With a force of 5 Newton's Amanda pushes the stacks of books to the right. At the same time Jeremih her little brother pushes th
Fynjy0 [20]

Alright, so solving for the net force is a rather simple and easy step. I want to briefly explain how you determine the net force, but before I do, let's examine the problem together. What has been provided to us? What direction is it going? Well, we can look at the information!

Amanda's Force: 5 N

Jeremiah's Force: 10 N

They're both pushing on the books, but in different directions. Left and right. If Amanda is pushing the books to the right 5 newtons, and Jeremiah is pushing the books to the left with 10 newtons, that means the net force is 5. The book is being pushed to the left! We can say that because Jeremiah's force is much larger than his sisters.

We can determine the net force from the following;

Net Force → 10 N - 5 N = 5 N

In conclusion, your answer should be a total of five (5) newtons

4 0
3 years ago
Read 2 more answers
Why are telescopes that detect non- optical radiation useful for studying objects in space
zmey [24]

Because many objects in space don't radiate any optical (visible) radiation at all.
And other objects, like stars, radiate a lot of invisible radiation in addition to the
visible light from them.  So the ability to detect and measure invisible radiation
makes it possible to learn a lot more about objects in space than we could if
we could only use their visible light.


8 0
3 years ago
Which wave causes the medium to vibrate only in a direction parallel to the wave’s motion?
andreyandreev [35.5K]
When the vibration is in a direction parallel to wave's motion that is a Longitudinal wave  (C).

But When the vibration is in a direction perpendicular to wave's motion then it is Transverse wave.

6 0
4 years ago
Read 2 more answers
Compounds are only formed and broken apart by blank?
ELEN [110]
I think the answer your looking for is chemical reactions
6 0
3 years ago
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