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Nawab din Bakhash
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The Moon is Receding, and the Tides are to Blame
The Moon gets further from the Earth by about 4 cm per year.

The graphic helps understand why:
1. The Moon raises tidal bulges in the Earth’s oceans.
2. As the Earth rotates, friction causes the tidal bulge to be pulled in the rotation direction, so that it is not directly under the Moon.
3. The water in the bulge exerts a small gravity force on the Moon. Because of the bulge’s offset, part of this force is to the left, and this causes the Moon to speed up slightly.
4. As it speeds up, the size of its orbit increases.

Distance measurements using lasers are so precise that the increase in orbit size has been verified. In a few hundred million years, the Moon will be far enough away that it can no longer cover the Sun, and there will be no more total solar eclipses.

The same phenomenon causes the Earth’s rotation rate to slow down. The total Earth-Moon angular momentum must remain constant, and as the Earth imparts angular momentum to the Moon, the Earth’s angular momentum (and rotation rate) must decrease.

#physics #Moon #gravity
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The Ultimate Free Fall
Suppose we had a tunnel through the entire Earth, passing through the center. Then, we drop an object into the tunnel.

How long would it take, neglecting air resistance, to reach the center?

The answer is 21 minutes. Actually, as the animation shows, it would continue on to the other side, returning to the starting point after 84 minutes.

Such a tunnel is impossible, of course. However, the problem is sometimes worked out in physics classes as an exercise. The equation that governs the motion turns out to have the same form as for a mass suspended on a spring, and allowed to oscillate up and down. 

One thing that the mathematics shows is that the point where the mass is released does not matter – if we lowered the object half way down the tunnel before releasing it, the fall to the center would still take 21 minutes.

Edit Oct 28, 2015: I have written a more complete description of the Earth Tunnel at http://goo.gl/S6Ok4X

Animation source: Wolfram Demonstrations

#physics
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Every day science surprises us with the discoveries that are going on within its field leaving us awestruck with the realization that we still know so little. 

#sciencefacts  #interestingfacts  #earthdrilling  #earth  #speedoflight  #universalspeed  #sonoluminescence  #sound  #light  #venusmountains  #plicasemilunaris  

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Good morning my dear friends.
Have a fabulous day friends.
"Life is a cup of coffee...
Its all in how
You make it
Or, take it"
Happy Friday.... friends
Jai shree Krishna...
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Who kneels before God stands upright, Whichever the difficulty.....ana
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