• 2 months ago
Earth ki density kese maloom karte hain
Earth ki density kese calculate karte hain
Physics class 11th
Mdcat physics
First year physics
Transcript
00:00hello everyone welcome to my youtube channel dear viewers and a students
00:08today we will calculate the average density of earth as we know that density
00:20rho is equal to mass per unit volume so for earth it will be mass of earth
00:38divided by volume of earth so we can also write it as mass of earth divided
00:51by volume of earth is mass of earth is equal to G into r e square upon capital G
01:07and volume of earth is earth is spherical shaped so the volume of
01:20spherical shaped bodies is calculated by the formula 4 upon 3 pi r cube so here r
01:30is the radius of earth so r e cube r e denotes to radius of earth so average
01:38density of earth will be G into r e square divided by capital G when we will
01:49change deviant into multiplication then then the values of denominators will
01:56come into numerators and the values of numerator come into denominator so it
02:02will be 3 upon 4 pi r e cube so r e square will be get cancelled with r e
02:17cube so the average density of earth will be obtained as 3 into G it will be
02:273 into G upon 4 pi into G into r e so by putting the given values the average
02:44density of earth will be 3 into as the value of G on the surface of earth is 9.8
02:51meter per second square divided by force into the value of pi is 3.14 into the
03:01value of capital G is 6.67 into 10 raised to power minus 11 into the radius of
03:09earth is 6.4 into 10 raised to power 6 so the average density of earth will be
03:233 into 9.8 it will be 29.4 divided by when we will multiply all the
03:33given values then we will get 536.16 into 10 raised to power minus 11 plus 6 so it
03:54will be minus 5 so after simplification we will get the answer is 0.0548 into 10 raised to power
04:15plus 5 so when we will shift decimal up to two digits from left to right then we
04:28will subtract minus 2 from the power so average density will be obtained as 5.48
04:40into 10 raised to power 3 kilogram per meter cube or we can also write it as the average
04:56density will be 5.5 into 10 raised to power 3 kilogram per meter cube or we can also write it as the average density of earth will be 5500 kilogram per meter cube
05:26so this is our required value for the average density of earth thank you

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