"How it is found that the 24 hrs makes a day and what will happen if earths diameter is reduced by half"

Answer 1

Earth makes a complete rotation about its axis means that a point on its surface rotates by 2*pi radians about the Earth's axis (i.e. N-S-axis).The time to perform this 1 complete rotation is 1day divided into 24 hours. So, angular speed of rotation is, omega = (2*pi)/(24*3600) rad/sec. This value is constant and doesn't depend on the radius of Earth. So, even if the radius is halved or changed to any other finite positive value, the rotational speed remains the same. Hence, same angular displacement in same time and thus the length of day remains 24 hours.

Answer 2

Observers of the sun note that our day is 24 hours long. If the diameter of the earth was reduced by half (without loss of mass) the day would be much shorter because of conservation of rotational momentum. A figure skater can spin at faster and faster speeds by pulling in her arms (reducing her diameter). The new speed would of course depend on the new distribution of mass. If the earth's diameter is reduced by half by pealing off layers (and losing mass) far more than half the mass would be lost. The length of the day for the "new" earth would not change because the remaining earth would still have the same momentum that portion of the earth originally had.

Answer 3

By monitoring starts.

Egyptian divided day into 24 hours, except each hours had different length depending on the season.

As long as speed of rotation is same, diameter does not matter to the length of the day. (Same reason it does not matter how big your analog clock is, it takes 12 hours for short arm to rotate full circle.)

But, it would be half the distance from where you are to Hawaii, and 1/4 space on the earth and will be very crowded.

Answer 4

For a history of the 24 hour day, try this link:

http://mathforum.org/library/drmath/view/58460.html

If you reduce the earths diameter by half, the results will depend on exactly how you make the reduction.

For more fun and how old standards affect todays world, try this link:

http://www.naciente.com/essay94.htm

Answer 5

It takes that much time (24 hours) for the Earth to rotate once on its axis.Its a function of the speed at which Earth rotates on its orbit and the time involved.

If the diameter of the earth is halved, logically it should take half as much time for the earth to complete one rotation !

Answer 6

thats how long it takes the world to make one spin, and noone knows exactly who the person was that thought that up. If earths diameter was reduced by half, our days would be half as long.

Answer 7

actually there are 4 seperate days that make up the earth day and it doesnt matter the diameter. there are 4 corners to the time day. scientists are evil!

Answer 8

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