The Height of Skyscraper

The following concerns a question on a physics degree exam at the University of Copenhagen:

"Describe how to determine the height of a skyscraper with a barometer."

One student replied: "You tie a long piece of string to the neck of the barometer, then lower the barometer from the roof of the skyscraper to the ground. The length of the string plus the length of the barometer will equal the height of the building."

This highly original answer so incensed the examiner that the student was failed immediately. The student appealed on the grounds that his answer was indisputably correct, and the university appointed an independent arbiter to decide the case.

The arbiter judged that the answer was indeed correct, but did not display any noticeable knowledge of physics. To resolve the problem it was decided to call the student in and allow him six minutes in which to provide a verbal answer, which showed at least a minimal familiarity with the basic principles of physics.

For five minutes the student sat in silence, forehead creased in thought.

The arbiter reminded him that time was running out, to which the student replied that he had several extremely relevant answers, but couldn't make up his mind which to use.

On being advised to hurry up the student replied as follows:

"Firstly, you could take the barometer up to the roof of the skyscraper, drop it over the edge, and measure the time it takes to reach the ground. The height of the building can then be worked out from the formula H =0.5g x t squared. But bad luck on the barometer."

"Or if the sun is shining you could measure the height of the barometer, then set it on end and measure the length of its shadow. Then you measure the length of the skyscraper's shadow, and thereafter it is a simple matter of proportional arithmetic to work out the height of the skyscraper."

"But if you wanted to be highly scientific about it, you could tie a short piece of string to the barometer and swing it like a pendulum, first at ground level and then on the roof of the skyscraper. The height is worked out by the difference in the gravitational restoring force T = 2 pi sq. root (l/g)."

"Or if the skyscraper has an outside emergency staircase, it would be easier to walk up it and mark off the height of the skyscraper in barometer lengths, then add them up."

The arbiter accepted all answers and asked the student that you must be knowing what the professor was expecting?
The student replied,  yes I do,  but I hate others to decide what way I should think.

The student was Niels Bohr, the only Dane ever to win the Nobel Prize for Physics.!

LET THE MIND BE FREE

Live for Others

In 1892 at Stanford University, an 18-year-old student was struggling to pay his fees. He was an orphan, and not knowing where to turn for money, he came up with a bright idea. He and a friend decided to host a musical concert on campus to raise money for their education.

They reached out to the great pianist Ignacy J. Paderewski. His manager demanded a guaranteed fee of $2000 for the piano recital. A deal was struck and the boys began to work to make the concert a success.
The big day arrived. But unfortunately, they had not managed to sell enough tickets. The total collection was only $1600. Disappointed, they went to Paderewski and explained their plight. They gave him the entire $1600, plus a cheque for the balance $400. They promised to honour the cheque at the soonest possible.

“No,” said Paderewski. “This is not acceptable.” He tore up the cheque, returned the $1600 and told the two boys: “Here’s the $1600. Please deduct whatever expenses you have incurred. Keep the money you need for your fees. And just give me whatever is left”. The boys were surprised, and thanked him profusely.
It was a small act of kindness. But it clearly marked out Paderewski as a great human being.
Why should he help two people he did not even know? We all come across situations like these in our lives. And most of us only think “If I help them, what would happen to me?” The truly great people think, “If I don’t help them, what will happen to them?” They don’t do it expecting something in return. They do it because they feel it’s the right thing to do.

Paderewski later went on to become the Prime Minister of Poland. He was a great leader, but unfortunately when the World War began, Poland was ravaged. There were more than 1.5 million people starving in his country, and no money to feed them. Paderewski did not know where to turn for help. He reached out to the US Food and Relief Administration for help.
He heard there was a man called Herbert Hoover — who later went on to become the US President. Hoover agreed to help and quickly shipped tons of food grains to feed the starving Polish people.
A calamity was averted. Paderewski was relieved.

He decided to go across to meet Hoover and personally thank him. When Paderewski began to thank Hoover for his noble gesture, Hoover quickly interjected and said, “You shouldn’t be thanking me Mr. Prime Minister. You may not remember this, but several years ago, you helped two young students go through college. I was one of them.”

The world is a wonderful place. What goes around comes around. Please help others to the best of your ability. In the long run you may be helping yourself. God never forgets anyone who sows a good seed in other people, never.

Nothing in nature lives for itself. Rivers don't drink their own water. Trees don't eat their own fruit. Sun doesn't give heat for itself. Flowers don't spread fragrance for themselves. Living for others is the rule of nature. And therein lies the secret of living.