10_একাদশ শ্রেণী_পদার্থবিদ্যা_মহাকর্ষ - মহাকর্ষীয় বলক্ষেত্র ও ক্ষেত্রপ্রাবল্য
10_একাদশ শ্রেণী_পদার্থবিদ্যা_মহাকর্ষ - মহাকর্ষীয় বলক্ষেত্র ও ক্ষেত্রপ্রাবল্য
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00:00You must have seen the Makarsha net, many times this net is not seen with the naked eye,
00:14only in the middle of the net, the Makarsha is seen, even a small bird can get stuck in
00:23this net without seeing it, and the Makarsha pulls it towards itself, in the same way,
00:29the Makarsha creates such an invisible net all around it, so that it can pull other
00:38invisible objects towards itself, this invisible net is called the gravitational field or Makarsha
00:47net, even though the Makarsha is invisible, the center of the Makarsha is visible, the
00:55Makarsha is visible, even though the influence of this gravitational field is mathematically
01:01infinite, it actually has a very far-reaching effect, I think that there is an invisible
01:07area all around the earth like this picture, if a small object is affected by this area,
01:16the object feels a ball that attracts it towards the earth, the weight of this ball is
01:23different in different parts of that ball area, the measurement of the ball experienced by the
01:29object is called the area of the area of the ball, the matter is understood a little better,
01:36according to the equation, if a single ball is kept at any point in the Makarsha area,
01:42the attraction ball experienced by that single ball is called the Makarsha area at that point,
01:50while a single object of this size is brought to any point in the area of the earth,
01:56that is called the F-Makarsha ball, therefore, a single object will experience F by M ball at that point,
02:07therefore, the intensity of the Makarsha area at that point will be E is equal to F by M,
02:16we know that the intensity of the Makarsha area at that point will be F is equal to gmm by r square,
02:26where g is the intensity of gravity, m is the weight of the earth and r is the distance from the center of the earth to that point,
02:36therefore, the Makarsha area at that point will be E is equal to F by M or gmm by r square by m
02:47or gm by r square, have you seen this gm by r square part somewhere before?
02:54Yes, of course, you have seen, in fact, gm by r square is equal to the magnitude of gravity on earth,
03:01small g is equal to gm by r square,
03:06E is equal to small g,
03:31therefore, the intensity of the Makarsha area at that point will be E is equal to F by M or E is equal to mg by m or E is equal to small g,
03:44E is equal to F by M,
03:48the intensity of the Makarsha area will be Newton per kg,
03:53the magnitude of the Makarsha area will be m to the power 1, l to the power 1, t to the power minus 2 by m to the power 1,
04:01that is, l t to the power minus 2, that is, the magnitude of the area,
04:06since the ball is a vector, the magnitude of the Makarsha area is also a vector,
04:11but what is this side?
04:13If we light a vector beam, we get E vector is equal to F vector by m,
04:19that is, the side of the Makarsha ball will be the side of the area.
04:25We know that the Makarsha area is an invisible area around the object,
04:32in which the object feels an attraction when an object comes next to it.
04:37The more the weight of the object, the more the area of the object.
04:42Like the influence of the Makarsha area of the Earth, the Moon represents the Earth.
04:48The area of the Sun is much larger than that of the Earth,
04:56which is why the 9 planets represent the Sun.
05:00In order to increase the area of the Sun,
05:04our Sun and our solar system are connected to other planets.
05:10Another important parameter other than the area of the Sun is the magnitude of the Makarsha area.
05:16We know. Keep watching.