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About Sirjon

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  • Birthday January 27

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    reading books, playing guitar, chess game & basketball
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    BSE-Math undergrad, Electronics Technology Course
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    I love Science but I am not that highly achieved person, no Ph.D or what-so- ever but wish to a member of this forum
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    TV Repairman

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  1. Possibly. But as I comprehend it, time travel in the future is simply like, freezing space in a certain period of time and then flows back with the arrow of time. Since, there's no activity on the time traveler himself, he will then be amazed to discover that he's in 2050. Now, time travel in the past, in it's lower limit (I hope i use the right word), means to travel back in time before an event happens. Example, if you heard someone will going to assassinate your friend and it took you a minute to warn your friend before it actually happened, then that is considered to be a time travel (somehow). IMO, time is relative, as according to Einstein. As I also learned, all the activity going on in space (Astronomy) were already the 'past' as it took time for light to reach us. Now, a time traveler can conquer time if it can do an activity far more faster at it's contained occupied space. So, as I see it, it is one way for a time machine to possibly exist.
  2. In a way, i appreciate you inserted the word 'currently'. Although, it is more like a SF, I am not really speculating a petty theory of my own, i just want to know your own opinion (may not hurt the real science, I believe), conducting a lively discussion regarding those two topics.
  3. I am wondering if Time Travel and Teleporting have the same or similar process. I know it well that if we deal with shortening the time to be in a certain place instantly, in split second - that is Teleporting. Now, if you past by, reversing the time and to be on that same place at much older years - that is, Time Travel. Now, i also assume that it is possible for a man to travel in the future, by means of a more practical way - 'hibernation', a kind of a long sleep, given that your body will not be affected by old age or other external biological factors. Then of course, if Einstein is correct, it is impossible to travel back in time if an object has a mass of its own, travelling at the speed of light. Just for curiosity, for the sake of great number of topics regarding time travel and teleporting, I assume that we cannot travel back in time by simply speeding up, covering a large distance that will stop the clock and then , if we gain acceleration, reverse the hands of clock - that will end up to be a kind of a combination of teleporting + time travel. However, if we are contained in the what-so-called fabrics of Space-Time continuum, then MAYBE, someday, if our future technology could be able to discover a way to reverse the arrow of time (past>present>future), then Time travel will be a dream of the past. I realized then, as personal hypothesis, time travel and teleporting have different process, that is, in teleporting, you need to speed up travel to shorten time to be able to cover a large distance (if you're in London, then split second, you're in new York), while time travel has to do with 'staying' in the same place (or occupying the same space) while changing going on in it's environment (let's say, like in a SF, contained in a Time travel capsule), reversing the arrow of time. What is your say regarding this?
  4. Yes, Tanya, that is also a good way of squaring numbers (of any number of digits) ending in five. Thank you. Now, when we deal with perfect square numbers less than 10000, that is in four-digits, we can also do a short cut method Check the list below: 1^2 = 1 9^2 = 81 both ends in 1 2^2 = 4 8^2 = 64 both ends in 4 3^2 = 9 7^2 = 49 both ends in 9 4^2 = 16 6^2 = 36 both ends in 6 0^2 = 0 5^2 = 25 ( no co-related pair) Although not all numbers ending in 1, 4, 6, or 9 are perfect square numbers, it's a smart practice to always make an 'assumption' that if the last digit falls in either numbers, then it could possibly be a perfect square. _______ \/ 1,296 Step 1: Group the number into two digits starting from the decimal point ______ \/ 12'96. Step 2: Find a single number which square value equal or nearest but less than to 12 Answer: 3 (the square of 3, which is 9) Since the given number end in 6, we can make assumption that last digit of your possible answers could either be 4 or 6 Possible Answers: 34, 36 Step 3: To get the correct answer, multiply the first digit of your known possible square roots by a number next to it, higher by 1. Next to 3 is 4, so 3 x 4 =12 (to get the estimate middle square value) Rule 1: If the first two digits of the actual given value (12'96) is higher, or equal to the estimate middle square value (which is12), choose the higher possible answer Rule 2: If it is lower to the estimate middle square value, choose the lower possible answer Answer : 36 Check: Square of 34 = 1,156 ( in 11'56, 11 is less than 12)
  5. As I see it, at a point of singularity, the universe is at 'zero' size, could only mean 'nothing' , when it comes to its physical dimension. Is am wrong? Correct grammar:Am I wrong? This is what I mean regarding Dark matters Correction: Dark matter (singular)
  6. As far as I know, it is how BB theorized, came from a point of 'singularity'
  7. IMO, as to my understanding as what DM is about, there is 'something' out there that cannot be seen, undetected by instruments by NASA or other scientific entities that causing the Universe to expand. So, in term of standard notion of how we determine a thing, there is 'nothing' out there but definitely, it's affecting the behavior of the Universe. It is still some kind of a mystery that science still searching for an answer. There's no such thing as something that came out of 'nothing'. The reason why the BB is still an incomplete theory, as it only indicates that matter, space and universe came out of 'nothing' (if we speak of its physical dimension).
  8. Okay, since I'm still waiting for the food to cook, let me add this thing,for others who are a bit confused with squaring a number using 'string squaring'... Always remember that in squaring a single digit number (from 1 to 9), the square value should always be in two digits (or two decimal places). So let me give you the list 0^2 = 00 5^2 = 25 1^2 = 01 9^2 = 81 2^2 = 04 8^2 = 64 3^2 = 09 7^2 = 49 4^2 = 16 6^2 = 36 You will also notice that both squares of 1 and 9 ends in 1 (1,81). So the others, with similar pattern except 0 and 5. I call them 'ten-square co-related'. This is useful when dealing with perfect square numbers. (i will show how it works, some other time). Now, let's apply this to 'String Squaring', this time to determine if the square root of 2, which is 1.4142, is approximately correct. 1.4142^2 = ? 14^2 = 01'16 <<< Fundamental squares as equal to /x^2//y^2/ in (x+y)^2 = x^2+2xy+y^2 1x8 = 8 | <<< Sub-product as equal to 2xy 1.41^2 = 01.96'01 14x2 = 2'8 | 1.414^2 = 01.98'81'16 141x8 = 1'12'8 | 1.4142^2 = 01.99'93'96'04 " X 4 = 5'65'6 | The symbol " just to save time in repeating to write numbers 01.99'99'61'64 Therefore 1.4142^2 = 1.99'99'61'64 = approx. 2.00
  9. Since this is math Tutorial section, let me share something that I wish, could be a big help for kids who's really having hard time understanding (or I may say, following) the traditional method of finding the square root of a number (as I do, until now). but before we go to that, let me first share you the following: 1) SQUARING TWO-DIGIT NUMBERS ENDING IN FIVE 5^2 = 25 15^2 = 225 25^2 = 625 35^2 = 1,225 45^2 = 2,025 55^2 = 3,025 65^2 = 4,225 75^2 = 5,625 85^2 = 7,225 95^2 = 9,025 What do you notice? First, when you square any number ending in five, you will always get an answer always ending in 25 Second, the first digit before the 5 (as in 15^2), as long as the given number is a two-digit number, always follow the rule below: /N//5/^2 = /Nx(N+1)//25/ Example: 15^2 => /1//5/^2 => /1x(1+1)//25/ => /1x2//25/ => 2'25 = 225 2) SQUARING NUMBERS MORE THAN TWO DIGITS ENDING IN FIVE USING THE COPY AND PASTE RULE I'm sure most of us, know it well, mentally that 12^2 =144, What then if make it into 125^2? 125^2 => /12//5/^2 => /144//25/ + C.A.P. => / 12/ | (the symbol "|" means to bring down) /156//25/ => 1'56'25 = 15,625 The C.A.P stands for copy and paste, meaning, as we already know the the square of 12, which is 144, then we automatically include 25 at the end as to the rule that the square of any number ending in 5 always ends in 25 and simply copy the number (12) and then paste it down and add to the known square of 12 (which is 144). This rule will always work as long as we already know the square of the digits on the left of 5. 3) AVERAGING AND FLOATING SIX RULE Now, let's consider this, let's say that we have numbers, 10 and 15. As we can do it mentally, 10^2 = 100 and 15^2, applying the technique i presented above, will be 225. We want to know the square of 12.5, which is actually, in between the squares of 10 and 15. 15^^2 = 225 + 10^2 = 100 325 / 2 = 162.5 << This value is not accurate If we actually try to get the square of 12.5 , which is the in-between of 10 and 15, we got 156.25 To settle this problem, as a rule - we must omit the last 5 of the quotient (162.5 to 162) then subtract by 'floating 6' then include 25 at the end 162.5 => /162./ =>/162. - 6 /<->/25/ = /156.//25/ => 156.25 = 156.25 I call it 'floating 6' because it does not follow the real math rule that involves decimal places. So as a general rule, for this particular section, we must omit the last digit 5 (as it should always be), then subtract by floating 6 and include the 25 at the end part. Now how is this relevant to finding the square root of a number? Well let me introduce first, to you another thing I call it 'String Squaring' Let's start with 12^2 = 144 Now let's include 3 next to 12 ... 123^2 = /144/09/ (fundamental squares) + 12x6 = / 7 2|/ (sub-product) 15129 (total) This time, make it 1234^2 ...... 1234^2 = 1'51'29'16 + 123x8 = '98'4| 1'52'27'56 I called it 'string squaring' as if you include another digit to the right of a number, we can easily get the square of the new number, as long as you already know or had the square of the previous number. Again, this is important to ESR. Now let's try to apply those rule in finding the square root of 2.00 Without specifically presenting all the details, just to give you an idea how ESR works, let's start with 1 as the first digit of our answers. Now, for most kids, the next digit after 1 is really somewhat a big question... you have nine possible guess (1.1, 1.2, 1.3, ....up 1.9) and only one is eligible . To make it easier, we need to know the middle square value between 2 and 1 (since the 2.00 is between the squares of 2 and 1), we will get 1.5 Using the first rule, finding the square of two-digit numbers ending in five, we have now an idea that 1.5^2 = 2.25 which is way above 2.00. So a kid will now have 4 choices instead of nine, (4,3,2,1) as the next digit after 1. (one then the decimal point). Then apply the 'averaging', add the square of 1.5 to 1.00, and divide by 2 the sum we get 1.625, or 1.5625 to be exact, which is way below 2.00. So we come up with two numbers to guess - 4 or 3. Applying the 'string squaring'... 1.4^2 = 1.16 (FS) +1x8 = 8 | (SP) 1.96 Acceptable Then for the next digit after 1.4, apply the copy and paste... 1.45^2 = /1.96/25 +CAP = 14 | 2.10'25 Way above 2.00, so again, the averaging, we come up with only two guesses, 2 and 1, use the 'string squaring'. Repeat the process to get the other next digits. I hope my presentation is clear to you and I hope it will help your kids, as I'm sure as you will agree, kids hate to subtract huge number as well as dividing numbers, except dividing numbers by 2, which is an easier thing to do. Thanks moderator, for putting it on the proper section. Again, still not familiar with other sections...
  10. What is there, twice in a week, once in a year but never in a day? Clue: Nothing the same with a day or night
  11. and it happened the other posts did not show up on time, I apologize
  12. Sorry. I have more relevant question.
  13. So, the reason why we need oxygen or some kind of fuel to burn? In a vacuum like the outer space, what happen to the gas that been exhausted? Is there a trail like the one we see every time a jet plane pass through the clear sky?