If a woman is standing in an elevator, she feels a force of gravity pushing her against the floor. As the elevator accelerates upwards, this force increases. She still feels as if a ‘gravitational’ force has increased...

# Category - Physics, Math

Interesting Physics and Math Stuff

Centrifugal force is observed by the rotating bucket of water – pulling it towards the center. The bucket of water is in a noninertial frame ,what we (in our own inertial frame) observe is the centripetal...

Is 20 C twice as hot as 10 C? No – because the centigrade scale does not start at 0.For e.g.- if we used a meter scale that started at 1.0 meters, what can you say about comparing 1.1 to 1.2? Can you say that 1.2 is TWICE...

The original problem Three doors, a prize behind only one door (say, a new car). Other two doors are each hiding a goat. Contestant has to pick a door – and hope that she wins the car. At just this stage, the chance of...

Counting Elements versus Counting Intervals The interval [0,1) for example is uncountable, but we are not counting ELEMENTS of an interval, we are counting INTERVALS. [0,1] is one interval, [0,1/3] is another and so...

How often have you stared at a math (or physics) problem, unsure of where to begin? Most math books are unusually pedantic and dull – all in an attempt to be more ‘rigorous’. Screw rigor, I say. Students are...

The short answer is ‘No’. If you think about what the zero-point energy represents, it is the lowest POSSIBLE energy state of a system. For us to extract any energy out of this system would leave it in an even lower energy...

Galilean Transformation – v’ = v +- V – cannot be applied to light If (x1 , t1) and (x2,t2) are two events in K, and (x1’,t1’) and (x2’,t2’) are their co-ordinates in K’, then (x2 –x1) / (t2 –...

A Logical Paradox – The British Air Force Bombing Paradox The British Airforce announces that it will bomb the city sometime during this week; but at an unpredictable date. Why is this paradoxical. Suppose, they announce this...

Since we are trained to think classically, it is not entirely possible to get an ‘intuitive’ understanding of Quantum physics. Several classical, common sense notions like the momentum of a material...