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QveST [7]
3 years ago
11

Help me out please i need answer ASAP

Geography
1 answer:
hjlf3 years ago
7 0
A......................................
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Assume that the Moon is hit by about 25 million micrometeorite impacts each day (this number comes from observations of meteors
mestny [16]

Answer:

3.03 Billion Days or 8.30 Million years

Explanation:

Given,

No. of micrometeorite impacts per day on the Lunar surface = 25000000

Impacts needed to erase a footprint = 20

Area of footprint = 300 cm²

We know that surface area of the Moon = 37.93 Million Km² = 37.93\times 10^{16} cm^{2}

To find:  How long will it take to erase one footprint?

Using the above information,

No. of impacts per cm² per day is

= \frac{25000000}{37.93\times 10^{16}}

No. of impacts on area of a foot print (300 cm²) per day will be,

= \frac{25000000}{37.93\times 10^{16}}\times 300

= 6.59\times 10^{-9}

To erase the footprint there must be 20 impacts on the area of footprint.

Time taken for 6.59\times 10^{-9} impacts = 1 Day

Time taken for 1 impact is

= \frac{1}{6.59\times 10^{-9}} days

Hence, time taken for 20 impacts will be

= \frac{1\times20}{6.59\times 10^{-9}} days

= 3.03 \times 10^{9} days

= \frac{3.03 \times 10^{9}}{365}years

= 8.30 \times 10^{6} years

It would take around 3.03 Billion Days or 8.30 Million years for one of the footprints left by the Apollo astronauts to be erased.

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Five largest nations in the western hemisphere
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These are some of the countries in the Western Hemisphere.
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