About how long would it take for one of the footprints left by the apollo astronauts to be erased? (hints: use the moon's surface area to determine the impact rate per square centimeter, and suppose that a footprint has an area of 300

8.30 Million years                

Explanation:

Assuming that --

In one day, the moon's surface is hit by the number of micrometeorites

= 25 million                                                                                                                                                            = 25000000

To erase a footprint, the number of impacts needed are  = 20

It is given that area of footprint = 300 cm²

We know that surface area of the Moon is = 37.93 Million Km²

                                                                      =

Therefore, using above information, we get

No. of impacts on the moon per day per cm² is =

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

=

=

Now as assumed there must be 20 impacts on the footprint's area to erase the footprint

Time taken for impacts = 1 Day

∴ Time taken for 1 impact is given by

= days

Therefore, the time taken for 20 impacts will be

= days

=

=

= years

Hence, it would take 8.30 million years for the footprint to be erased.

a longitudinal wave moves energy that is to the direction of the wave’s movement. - true

the moon affects the earth gravitation ally, causing certain motions of that body and also producing tides in its ocean and atmosphere. the tidal wave in our atmosphere is, however, far too minute to be an effective cause in any known meteorological phenomenon.

explanation: