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Catalogs Discussion Forums -> Mechanics -> Simple harmonic motion -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]
Here the complete solution but check if it is right or wrong.....

when sphere is at anglr thita position then resolve  mg into two components such that mgcos balance the normal reaction and mgsin acting towards the mean position
let f= mgsin when is small sin=
   f=mg
    =mg(-x)/4R  (because mg acts at center of mass)........(1)
as f -x (x is arc )
therefore f is restoring force
f=-kx......... (2)
comparing 1 & 2
we find   k=mg/4R.................(3)
as  f = ma        (a= acceleration)
as in SHM a= - 2x =-kx/m
therefore           
= k/m
                  as   
=2pi/T
    T=/2pi
  T=(1/2pi)[ 2]m/k
by putting value of k from equation .....3
we get T = (1/2pi) 4R/g
   

Community shelf Community shelf -> Inspirational but .........funny -> Go to message
This Post 2 points    (Olaaa!! Perrrfect answer.   in 1 votes )   [?]

Here's some things to ponder on that concerns life in general....
1. Do not walk behind me, for I may not lead. Do not walk ahead of me, for I may not follow. Do not walk beside me, either. Leave me the hell alone.

2. The journey of a thousand miles begins with a broken fan belt and a leaky tire.

3. It's always darkest before dawn. So if you're going to steal your neighbor's newspaper, that's the time to do it.

4. No one is listening until you make a mistake.

5. Never test the depth of the water with both feet.

6. It is far more impressive when others discover your good qualities without your help.
7. If you think nobody cares if you're alive, try missing a couple of car payments.
8. Before you criticize someone, you should walk a mile in their shoes. That way, when you criticize them, you're a mile away and you have their shoes.
9. If at first you don't succeed, skydiving is not for you.
10. If you lend someone Rs 20, and never see that person again, it was probably worth it.

11. Some days you are the bug; some days you are the windshield.
12. Don't worry, it only seems kinky the first time.
13. Good judgment comes from bad experience, and a lot of that comes from bad judgment.
14. The quickest way to double your money is to fold it in half and put it back in your pocket.
15. Timing has an awful lot to do with the outcome of a rain dance.
16. There are two theories to arguing with women. Neither one works.

17. Experience is something you don't get until just after you need it.
18. Never miss a good chance to shut up.
19. We are born naked, wet, and hungry. Then things get worse.

Community shelf Community shelf -> Amazing Facts -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]

*Have a look......things you may not know....*
**
*1. Coca-Cola was originally green.*
*----------- --------- --------- --------- --------- --------- --------- ------*
*2. The most common name in the world is Mohammed.*
*----------- --------- --------- --------- --------- --------- --------- ------*
*3.The name of the entire continents end with the same letter
that they start with.*
*----------- --------- --------- --------- --------- --------- --------- ------*
*4. The strongest muscle in the body is the tongue.*
*----------- --------- --------- --------- --------- --------- --------- ------*
*5. There are two credit cards for every person in the United States.*
*----------- --------- --------- --------- --------- --------- --------- ------*
*6. TYPEWRITER is the longest word that can be made using the
letters on one row of the keyboard.*
*----------- --------- --------- --------- --------- --------- --------- ------*
*7. Women blink nearly twice as much as men!*
*----------- --------- --------- --------- --------- --------- --------- -----*
*8. You can't kill yourself by holding your breath.*
*----------- --------- --------- --------- --------- --------- --------- ------*
*9. It is impossible to lick your elbow.*
*----------- --------- --------- --------- --------- --------- --------- ------*
*10. People say "Bless you" when you sneeze because when you sneeze,
your heart stops for a millisecond. *
*----------- --------- --------- --------- --------- --------- --------- ------*
*11. It is physically impossible for pigs to look up into the sky.*
*----------- --------- --------- --------- --------- --------- --------- ------*
*12. The "sixth sick sheik's sixth sheep's sick" is said to be the
toughest tongue twister in the English language.*
*----------- --------- --------- --------- --------- --------- --------- ------*
*13. If you sneeze too hard, you can fracture a rib. If you try to
suppress a sneeze, you can rupture a blood vessel in your head or neck
and die.*
*----------- --------- --------- --------- --------- --------- --------- ------*
*14. Each king in a deck of playing cards represents great king from history.
*>Spades - King David*
*>Clubs - Alexander the Great,*
*>Hearts - Charlemagne*
*>Diamonds - Julius Caesar.*
*----------- --------- --------- --------- --------- --------- ---*
*15. 111,111,111 x 111,111,111 = 12,345,678,987, 654,321
(count out the answer)*
*----------- --------- --------- --------- --------- --------- ---*
*16. If a statue of a person in the park on a horse has both front legs
in the air, the person died in battle.
If the horse has one front leg in the air, the person died as a result
of wounds received in battle.
If the horse has a all four legs on the ground, the person died of natural
causes.* <cool huh!!>
*----------- --------- --------- --------- --------- --------- ---*
*17 What do bullet proof vests, fire escapes, windshield wipers and
laser printers all have in common?
Answer - All invented by women.*
*----------- --------- --------- --------- --------- --------- ---*
*18. Question - This is the only food that doesn't spoil. What is this?
Answer - Honey*
*----------- --------- --------- --------- --------- --------- ---*
*19. A crocodile cannot stick its tongue out.*
*----------- --------- --------- --------- --------- --------- ---*
*20. A snail can sleep for three years.*
*----------- --------- --------- --------- --------- --------- ---*
*21. All polar bears are left handed.*
*----------- --------- --------- --------- --------- --------- ---*
*22. American Airlines saved $40,000 in 1987 by eliminating one olive
from each salad served in first-class. *
*----------- --------- --------- --------- --------- --------- ---*
*23. Butterflies taste with their feet.*
*----------- --------- --------- --------- --------- --------- ---*
*24.Elephants are the only animals that can't jump.*
*----------- --------- --------- --------- --------- --------- ---*
*25.In the last 4000 years, no new animals have been domesticated. *
*----------- --------- --------- --------- --------- --------- ---*
*26. On average, people fear spiders more than they do death.*
*----------- --------- --------- --------- --------- --------- ---*
*27. Shakespeare invented the words 'assassination' and 'bump'.*
*----------- --------- --------- --------- --------- --------- ---*
*28. Stewardesses is the longest word typed with only the left hand.*
*----------- --------- --------- --------- --------- --------- ---*
*29. An ant always falls over on its right side when intoxicated. *
*----------- --------- --------- --------- --------- --------- ---*
*30. The electric chair was invented by a dentist.*
*----------- --------- --------- --------- --------- --------- ---*
*31. The human heart creates enough pressure when it pumps o squirt
blood 30 feet.*
*----------- --------- --------- --------- --------- --------- ---*
*32. Rats multiply so quickly that in 18 months, two rats could have
over a million descendants. *

*----------- --------- --------- --------- --------- --------- ---*
*33. Wearing headphones for just an hour will increase the bacteria in
your ear by 700 times.*
*----------- --------- --------- --------- --------- --------- ---*
*34. The cigarette lighter was invented before the match.*
*----------- --------- --------- --------- --------- --------- ---*
*35. Most lipstick contains fish scales.*
*----------- --------- --------- --------- --------- --------- ---*
*36. Like fingerprints, everyone's tongue print is different.*

Community shelf Community shelf -> Puzzle -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]

Puzzle:-->
In the ancient French Empire, 3 Musketeers Andy, Bayron, Charles are
charged with Treason, after the Trial they are given Death Sentence, to
be executed by the Great Archers from Cognac, (a town in France).
But, the Great French Emperor decides to give them a chance. The Emperor
places them in a line on three chairs, in such a way that Charls can see
both Andy and Bayron, Bayron can see only Andy, and Andy can see none of
the other men.
The Emperor shows them 5 Caps, 2 of which are Brown and 3 of which are
Blue.
After this, he blindfolds the men, places one Cap on each of their
heads, and removes the blindfolds again. The Emperor tells his three
prisoners that if one of them is able to determine the color of his Cap
within one minute, all of them are released. Otherwise, they will all be
executed. None of the prisoners can see his own Cap, and all are
intelligent.
After 59 seconds, One of the Musketeer shouts, and Saves all of the
three.
Question is Which One and what is the color of his Cap
For anwer wait till my next article.........


Catalogs Discussion Forums -> Mechanics -> Simple harmonic motion -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]
solve it or leave it ,i don't want any rating from you ........
bbye........
Community shelf Community shelf -> Good Lines -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]

'IF'

If you can keep your head when all about you
Are losing theirs and blaming it on you;
If you can trust yourself when all men doubt you,
But make allowance for their doubting too:
If you can wait and not be tired by waiting,
Or, being lied about, don't deal in lies,
Or being hated don't give way to hating,
And yet don't look too good, nor talk too wise;
If you can dream - and not make dreams your master;
If you can think - and not make thoughts your aim,
If you can meet with Triumph and Disaster
And treat those two impostors just the same:.
If you can bear to hear the truth you've spoken
Twisted by knaves to make a trap for fools,
Or watch the things you gave your life to, broken,
And stoop and build'em up with worn-out tools;
If you can make one heap of all your winnings
And risk it on one turn of pitch-and-toss,
And lose, and start again at your beginnings,
And never breathe a word about your loss:
If you can force your heart and nerve and sinew
To serve your turn long after they are gone,
And so hold on when there is nothing in you
Except the Will which says to them: "Hold on!"
If you can talk with crowds and keep your virtue,
Or walk with Kings - nor lose the common touch,
If neither foes nor loving friends can hurt you,
If all men count with you, but none too much:
If you can fill the unforgiving minute
With sixty seconds' worth of distance run,
Yours is the Earth and everything that's in it,
And - which is more - you'll be a Man, my so


Catalogs Discussion Forums -> Electricity -> Please help again -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]
If battery is placed between A & B then it can not be wheat stone bridge and solve it simply by using  resistance in parallel  formula..
Catalogs Discussion Forums -> Electricity -> Electric field -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]
as E=-dv/dr
  along x-axis  E=-dv/dx
First move from -1 to origin
                    [-1 ][0 ] E.dx=-[120 ][ v] dv
                            E= 120 - V.........(1)

                       Now from origin to x =+1
                      [ 0][ 1] E.dx = -  [v ][ 80] dv
                               E = V - 80 ........... (2)
                  Add 1 and 2
                  we get E=20.
                              
Catalogs Discussion Forums -> Mechanics -> easy one... -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]
solution given by joy is right
Good work joy.....
Catalogs Discussion Forums -> Mechanics -> Simple harmonic motion -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]
when sphere is at anglr thita position then resolve  mg into two components such that mgcos balance the normal reaction and mgsin acting towards the mean position
let f= mgsin when is small sin=
   f=mg
    =mg(-x)/4R  (because mg acts at center of mass)........(1)
as f -x (x is arc )
therefore f is restoring force
f=-kx......... (2)
compare 1 and 2
and solve it....



Catalogs Discussion Forums -> Electricity -> Please Help me......... -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]
Hey anybody help me plzzzzzzz
Catalogs Discussion Forums -> Non IIT Institutes -> help plzzzz -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]
For placement pt. of view both are same.....
But atmosphere of thapar is much better than BITS ranchi..
And last thing thapar is very strict regarding studies ... so you can not do masti in thapar......
tapar is more expenses than BITs
Now you decide your self......
Catalogs Discussion Forums -> Electricity -> Please Help me......... -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]
If force acting b/w two charges when placed in vacuum = F.
Then force acting b/w two charges when placed in medium of dielectric constant k = F/k.
    
As dielectric constant of metals is infinity. so force b/w the chrges inside the metal should be 0.
But in most of the books it is written that charges can not reside inside the conductor because like charges repel each other and move maximum distance a part i.e surface of the conductor. because charge can only reside on the surface of the conductor....
 
i find this explaination very contradictory.......... please help me....... 
Catalogs Discussion Forums -> Mechanics -> HC Verma Problems -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]
Thanx joy..
Catalogs Discussion Forums -> Electricity -> electricity -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]
Hi nishant .. but how can you write I=at expression...
Catalogs Discussion Forums -> Electricity -> Please help -> Go to message
This Post 2 points    (Olaaa!! Perrrfect answer.   in 1 votes )   [?]
As it is wheatstine bridge ...
So effective resistance b/w A and B 1/r = 1/(R1 + R2)   + 1/R3 + R4).

and value of R can be any thing from 0 to infinity
Catalogs Discussion Forums -> Electricity -> conceptual probs on electric field -> Go to message
This Post 2 points    (Olaaa!! Perrrfect answer.   in 1 votes )   [?]
Q1). F/q is less than E. Because due to repulsion b/w two charges the charge attached to the thread will move away from the testing charge due to repulsion. So columb force will decrease .

For second question sol. is already there.
Catalogs Discussion Forums -> General Physics -> all of you guys -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]
Yes i agree.......
Catalogs Discussion Forums -> Mechanics -> Vectors -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]
1.After clearly reading the statement of the prob we get that we have to find the diagonal of the cuboid with length=7  , width=4 and height= 3.
therefore displacement = (diagonal length)2= length2 +width2 +height2 .
b). displacement vector d= 7i + 4j + 3k.

2. Find out A cross B , Let it be = to the C.
Nfind out C.B or C.A it should be equal to 0.   
Catalogs Discussion Forums -> Electricity -> electricity problem,halliday resnick,conceptual -> Go to message
This Post 2 points    (Olaaa!! Perrrfect answer.   in 1 votes )   [?]
Here infinite Electric field near the lowest charge is due to its own charge -q. As field vary inversly with distance from the charge and distance is very small near the charge so E is very high.
But charge -q experiences force due to
+q charge placed above it which force  is finite according to coloumbs law of electrostatic.









 
 
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