A car weighs 6000 N on the Earth's surface, what is its weight 3 times Earth's radius away from the center of the Earth? (N)
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Ответ:
667 N
Explanation:
And we need to find out the weight of the car at a distance equal to 3 times the radius of the earth , from the centre of the earth.
We can find the acceleration due to gravity at a height h from the earth's surface as ,
![\sf\longrightarrow \red{ g_h = g\bigg[ 1 +\dfrac{h}{R_e}\bigg]^{-2}}](/tpl/images/2642/9390/bfd04.png)
The height here will be 3R - R = 2R , since 3R is the distance from the centre of the earth .In above equation multiply both sides by m ,
Now here at the place of mg we can substitute 6000N , and mg
will be the weight at height h which we are interested in finding .
Ответ:
Correct
B . Pure democracy is impossible . Participatory democracy does not work in large countries
Explanation:
The author in the excerpt was talking about the need to differentiate pure democracy from what is obtainable currently in most country. He was of the opinion that, pure democracy offers people freedom of choice to debate and decide among themselves how to govern the country.
Unfortunately, pure democracy cannot not work among large country due to inability to manage the large number of people.