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Olin [163]
3 years ago
10

What latitudes are most likely to see glaciers??  

Physics
2 answers:
olga55 [171]3 years ago
7 0

Answer : Option D) 90°N and 90°S

Explanation : The latitudes which are given in the options are the angle to be measured in the direction of north and south respectively taking equator as the central line.

When it is 90°N and 90°S it means it forms an right angle and faces towards north and south respectively with respect to the equator, so there are high chances of pointing towards the Arctic and Antarctic regions respectively; therefore giving greater probability of finding glaciers.

olga55 [171]3 years ago
3 0
Latitude is an angle measured north or south from the equator. The greatest possible latitude is 90 degrees ... 90°N at the north pole, 90°S at the south
pole, and you can't get any farther from the equator than the poles.  So from
the latitudes on this list, 90°N and 90°S are the ones where glaciers are most
likely.
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Answer:

The sound intensity of train is 1000 times greater than that of the library.

Explanation:

We have expression for sound intensity level,

            L=10log_{10}\left ( \frac{I}{I_0}\right )

A train whistle has a sound intensity level of 70 dB

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           70=10log_{10}\left ( \frac{I_1}{I_0}\right )

A library has a sound intensity level of about 40 dB

We also have

           40=10log_{10}\left ( \frac{I_2}{I_0}\right )

Dividing both equations

           \frac{70}{40}=\frac{10log_{10}\left ( \frac{I_1}{I_0}\right )}{10log_{10}\left ( \frac{I_2}{I_0}\right )}\\\\\frac{7}{4}=\frac{log_{10}\left ( \frac{I_1}{I_0}\right )}{log_{10}\left ( \frac{I_2}{I_0}\right )}\\\\10^7\frac{I_2}{I_0}=10^4\frac{I_1}{I_0}\\\\\frac{I_1}{I_2}=10^3=1000

The sound intensity of train is 1000 times greater than that of the library.

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2 years ago
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Answer: If a star's radial velocity is -50 km/s, the frequency of its light would appear to be higher than its true frequency. We usually say that the star's wavelength is blue shifted.

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Radial velocity is defined as the velocity of how an object is seen by the axis of a circle.

Then, if the radial velocity is -50km/s, this means that the radius is decreasing, and then that the star is coming towards the viewer.

as the star is coming towards the viewer, we will see a shorter wavelength, which implies that the frequency would appear to be bigger as it really is.

and this is called a blue shift, because the blue light is the visible light with the biggest frequency, while the red light is the visible light with the smallest frequency, then we have:

If a star's radial velocity is -50 km/s, the frequency of its light would appear to be higher than its true frequency. We usually say that the star's wavelength is blue shifted.

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