Free Kick and Physics
One footballing situation particularly stands out as relevant to physicists: the free kick. Since the goal is typically defended with a wall of players, sco…
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Weird Rainbows
Upside down rainbows Upside down rainbows, or ‘circumzenithal arcs’, to give them the proper name, are not caused by rain. Normal rainbows form when light r…
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How does an ice pyramid work?
Ice Spikes If you go out one morning, just as the temperature has really started to drop, you might be forgiven for thinking that tiny aliens landed in your …
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What is a gravitational wave?
What is a gravitational wave? A gravitational wave* is a concept predicted by Einstein's theory of general relativity. General relativity states that m…
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How do speakers work?
Q.How do speakers work? A. Speakers come in all shapes and sizes, enabling you to listen to music on your iPod, enjoy a film at the cinema or hear a friend’…
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How does GPS(Global Positioning System) work?
Q. How does GPS(Global Positioning System) work? A. The Global Positioning System (GPS) is a network of about 30 satellites orbiting the Earth at an altitud…
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Why Do We Always See the Same Side of the Moon?
Q: Why does the moon always present the same face to us? I find it impossible to believe that this could happen by chance. A: Nope, not by chance — it’s pure …
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What is Elastic Potential Energy?
Elastic Potential Energy Any object than can be deformed (have its shaped changed) and then return to its original shape can store elastic potential energy.…
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If scientists can't see dark matter, how do they know it exists?
Q.If scientists can't see dark matter, how do they know it exists? Ans. Scientists calculate the mass of large objects in space by studying their motion…
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What is the Physics Behind Vacuum Cleaner?
When you sip soda through a straw, you are utilizing the simplest of all suction mechanisms. Sucking the soda up causes a pressure drop between the bottom of …
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Kaniz e zehra asked What is Heat?
11/13/2014 10:06:13 Kaniz e zehra asked What is Heat? Consider a very hot mug of coffee on the countertop of your kitchen. For discussion purposes, we will…
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Kaniz e zehra asked Two unlike capacitor is charged to a certain potential difference it is then immersed in oil what happen to it s capacitance ,charge and potential?
11/13/2014 9:49:27 Kaniz e zehra asked Two unlike capacitor is charged to a certain potential difference it is then immersed in oil what happen to it s capac…
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What is Voltage?
Voltage is electric potential energy per unit charge, measured in joules per coulomb ( = volts). It is often referred to as "electric potential", wh…
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What is the Physics Behind Walking on Broken Glass?
For this demonstration the glass bottles should first be soaked in water to remove any paper labels. An alternative is to use Mason jars. It is best to use f…
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What is proof of Kepler law of planetary motion that all planet has elliptical orbit? And why they have elliptical orbit instead of a circular orbit?
The orbit of a planet is an ellipse where one focus of the ellipse is the sun. An ellipse is defined by two focii and all points for which the sum of the di…
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What multiple of distance between the centre of the earth and that of the moon is the distance between the centre of the earth and the geostationary satelite which always stays above the fixed location on the equator ? take the cycle of revolution of the moomn around the earth to be 27 days ?
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According to Kepler’s third law of planetary motion T 2 =R 3 ( For geo stationary satellite)-------1 T’ 2 =R’ 3 ( For Moon)----------------------------2…
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Where can I see the aurora?
Auroras usually occur in ring-shaped areas centered around the magnetic poles of Earth. The complete rings, called the auroral ovals, can only be seen from sp…
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Why does aurora take different shapes?
Scientists are still trying to answer this question. The shape of the aurora depends on where in the magnetosphere the electrons came from and on what caused…
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Why the different colors formed in aurora?
The color of the aurora depends on which gas is being excited by the electrons and on how much energy is being exchanged. Oxygen emits either a greenish-yello…
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What causes the aurora?
The “northern lights” are caused by collisions between fast-moving particles (electrons) from space and the oxygen and nitrogen gas in our atmosphere.These el…
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Young's Double Slit Experiment
This is a classic example of interference effects in light waves. Two light rays pass through two slits, separated by a distance d and strike a screen a dista…
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Common Emitter Transistor Amplifier
The larger collector current IC is proportional to the base current IB according to the relationship IC =βIB , or more precisely it is proportional to the…
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What is a mirage? How is it formed?
A traveller has lost his way in the desert. Enduring thirst and hunger, he suddenly saw an oasis, so the overjoyed man quickly ran towards it. To his great di…
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Electromagnetic Induction:C.R.Q's /Questions
15.1 Does the induced emf in a circuit depend on the resistance of the circuit?does the induced current depend on the resistance of the circuit? Ans. The …
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