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VVinh

VVinh

Posts: 7,372 Rune Posts by user Forum Profile RuneMetrics Profile
Law of the lever
: In this case, an example of a seesaw:

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100 Kg
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''Heavier weight on shorter distance equals the lighter weight on longer distance in proportional''. I'm gaÿ.

23-Apr-2016 18:09:27 - Last edited on 23-Apr-2016 21:07:19 by VVinh

VVinh

VVinh

Posts: 7,372 Rune Posts by user Forum Profile RuneMetrics Profile
Let's discuss about Domino bricks.

If you know what it is then keep going to read.

By placing domino bricks and filling a board or grind like a checkerboard.

The question is: If you remove two random squares, and then trying to fill the entire checkerboard again with domino bricks. Can you cover all the squares in the checkerboards?

The answer is both yes and no.

To go deeper, every domino brick takes two squares (odd and even) or a black square and a white square in the checkerboard. If you remove two squares that are two odds (or two evens) or two black squares (or two white squares) then two holes will be left on the checkerboard. This will be impossible to fill the checkerboard.

This has been proven if you remove two squares (odd and even) or a black square and a white square in the checkerboard then you can fill the entire checkerboard without leaving any dead holes anywhere you start. I'm gaÿ.

24-Apr-2016 11:41:13

Scheneighnay

Scheneighnay

Posts: 334 Silver Posts by user Forum Profile RuneMetrics Profile
The way that communications and positioning satellites can establish downlinks to so many devices seemingly simultaneously is actually by having a single, extremely-high-bandwidth downlink cycling through all the different uplinks at extremely high speed.

Of course, a satellite can have multiple antennas on it, allowing for higher-priority uplinks to receive a faster, more steady connection. Pro Patria Vigilans
Non Sibi Sed Omnibus

25-Apr-2016 23:12:08

VVinh

VVinh

Posts: 7,372 Rune Posts by user Forum Profile RuneMetrics Profile
Trebuchet, a machine in medieval that used to fling heavy projectiles on targets far away.
It used the law of the lever to fling heavy stones, fire balls etc.
A big rod was connected to a fulcrum. One side was shorter and heavier and the longer side was lighter, holding a sling to fling.
To fire the trebuchet, they let a heavy box or something like that to fall in the shorter side of the rod in which it causes the entire rod to rotate its axis in the fulcrum. This makes the longer side of the rod to have a bigger rotation axis compared to the shorter and generates an acceleration to fling away the projectile.

100 Kg
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''Heavier weight on shorter distance equals the lighter weight on longer distance in proportional''.

In this example, if we double the weight from 100 Kg to 200 Kg and let the heavier side (the short side of the rod) to fall then the long side of the rod will fling away its 33 Kg projectile. I'm gaÿ.

26-Apr-2016 21:46:21 - Last edited on 26-Apr-2016 21:55:16 by VVinh

VVinh

VVinh

Posts: 7,372 Rune Posts by user Forum Profile RuneMetrics Profile
Pulley system:

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Here you pull the chain to lift 100 Kg (
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Notice the red fixed wheel (
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02-May-2016 21:34:23 - Last edited on 02-May-2016 22:35:09 by VVinh

VVinh

VVinh

Posts: 7,372 Rune Posts by user Forum Profile RuneMetrics Profile
Pulley system - continue -

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Pulley system uses the same principle as the law of the lever, but instead it uses to lift heavy objects using lower effort, to multiple the lifting strength at the cost of increasing the length the chain moves in the opposite side in proportional.

Notice the red fixed wheel (
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) shares 50 Kg weight each. Half the effort to lift 100 Kg but double the length pulled in the chain. I'm gaÿ.

02-May-2016 21:53:14 - Last edited on 02-May-2016 22:41:39 by VVinh

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