Remembering the Columbia Space Shuttle Disaster

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The 10 Greatest Physicists in History

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Anaximander Lived c. 610 BC – c. 546 BC. Anaximander  is responsible for the idea that the earth needs nothing below it to support it. He said that the earth floats in the center of infinity, held in position because it is an equal distance from all the other parts of the universe. In doing so, he transformed the way we think of our planet and simultaneously introduced the idea of a force of attraction between the earth and the planets and stars in the heavens. “In my opinion this idea of Anaximander’s is one of the boldest, most revolutionary, and most portentous ideas in the whole history of human thought.” KARL POPPER, 1902 – 1994 Philosopher of Science   Archimedes Lived c. 287 BC – 212 BC. The greatest scientist of ancient times,  Archimedes  pushed mathematics, physics, and engineering to new heights. He created the physical sciences of mechanics and hydrostatics, discovered the laws of levers and pulleys, and discovered one of the mos...
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Why is Earth the densest planet of the solar system?

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• Among all the planets in the solar system, the Earth is the densest planet. • Although small in size, the Earth has several remarkable physical properties which make it the densest planet in the solar system. • Density is defined as the mass of a substance divided by per unit of volume. It is usually calculated using the formula p=m/v. • The unit for density measurement is kilogram per cubic metre in the SI system. Other units used for measuring density are gram per centimetre cube and pounds per cubic metre. • In simple terms, the density of a substance is the measurement of how tightly its molecules are packed. • The calculations are easy and accurate when the substance is homogenous in nature i.e. all molecules are of the same shape and size. • However, in case of substances that have a heterogeneous nature, the calculation results may not be accurate. • This is exactly the reason why it is not easy to calculate the density of the Earth. • The Earth has dif...
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Can gravity be infinite? if not why?

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The kinetic energy that water gains when it falls (and can therefore be converted into electricity by a hydroelectric plant) comes ultimately from sunlight and not from gravity. As a force, no energy can be extracted from gravity itself. Public Domain Image, source: Christopher S. Baird. No, gravity can not be used as an infinite energy source. In fact, strictly speaking, gravity itself can not be used as an energy source at all. You are confusing forces with energy, which are very different things.  Energy  is a property of objects, such as balls, atoms, light beams, or batteries. In contrast,  forces  describe the  interaction  between objects. Forces are the way that energy is transferred from one object to another when they interact, but forces are not the energy itself. Gravity is a force, so it just provides one way for objects to exchange and transform energy to different states. If I lift a bowling ball to the top of a hill and let it go, ...
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