Featured articles Passenger in a moving trainMay 12, 2012A passenger in a moving train tossed a coin which falls behind him .State the type of motion of the train ? Answer: The train is in accelerated motion. Explanation If the train were moving with uniform velocity, the coin would fall back to the passenger's hand (This is due to the inertia of motion of the coin. When it was thrown 'vertically' up, it had the same horizontal velocity as that of the train. Therefore, it will move alongwith the train and fall back to the thrower's hand... Read more Bouncing ball and energy dissipation problemMay 2, 2012Please help me with the question below.. I'm totally confused! A player throws a ball of mass 0.6 kg into the air, to a height of 4.0 m above the ground. The ball then falls to the ground. During the impact, 22% of the ball’s energy is lost. Calculate the height to which the ball rises after the bounce. Your assistance will be appreciated.. Mustafa posted Answer: m= 0.6 kg h = 4.0 m Energy = mgh During impact 22% energy is lost. Therefore, energy remaining = 88% Therefore the en... Read more How does a microwave oven work?April 27, 2012Now, microwave oven is so popular that majority of houses have one. Many use it mainly to reheat food without loss of nutrient. The advantage is that the microwave heats up the food very fast. Some observations made on microwave oven are, It does not heat up the vessels directly It is not able to cook food contained inside metal vessels If the turn table does not work, cooking will not be even. So, it is pertinent to ask how the mechanism of heating in a microwave oven... Read morewhen no light is present so why do we see black colour ?April 25, 2012When no light is present so why do we see black colour ? Praveen Kumar asked Answer: Black is not the color, it just denotes the absence of light. When there is light, an object is seen black when it absorbs all light incident on it. Read more Relative DimensionsMarch 19, 2012Could u pls read my below theory of the universe [Ramkumar posted this] and pls contact me when done with ur real frank comments..... Assumption:Matter is Infinitely divisible... Hypothesis: if so we can infinitely into the micro and levels... Matter can be divided into many levels upon their size Theory: this that only result of 1 level affects the above and below levels... the levels are consistent... i.e the levels are complete in their sense.... this whole theory is ... Read more String TheoryMarch 13, 2012String theory suggests 11 dimensions. If the Big Bang involved a sudden expansion of three of those dimensions into the space we know today, is it possible that the energy for the Big Bang and subsequent expansion was caused by the collapse of one or more of the other 8 dimensions into the tiny form they allegedly inhabit today. The form of the before the Big Bang is unknowable but is this hypothosis possible? Related articles String Theorists Simulate the Big Bang (livescienc... Read moreINTENSIVE VARIABLES AND EXTENSIVE VARIABLESMarch 10, 2012A thermodynamic variable may be intensive or extensive. What are intensive variables? The variables which are independent of size or amount of substance are called intensive variables. Example: Density is an intensive variable. (because it does not depend on the amount of that substance) What are extensive variables? The variables which depend on the size or amount of the substance are called extensive variables. It is additive for independent, noninteracting subsystems Example: Mass and volume are extensive variables. (Because they are directly measuring the amount of substance) Read moreUmbrella Rain and SunMarch 6, 2012Rain is falling vertically.A man running on the road keeps his umbrella tilted but a man standing on the street keeps his umbrella vertical to protect himslf frm the rain...But both of them keep their umbrella vertical to avoid sun-rays... EXPLAIN.....!!!! Read moreHow long does it take for a ball to fall to the bottom of a coneFebruary 28, 2012Definitely not a homework question here, just a game that friends and I try to play to guess how long it takes a ball to fall to the bottom of a cone. I do not have a lot of physics experience, but I was under the impression that if we knew certain constants such as: the diameter and height of the cone, the mass of the ball, the velocity of the ball as it falls into the cone, the angle of the side of the cone, and the usual constants for gravity and friction - that we should be able to know the exact time the ball will fall to the bottom. We should also be able to know the distance the ball travelled going around the cone before hitting the bottom. Sadly, I am not quite able to work out how to guess either the time or distance. Any suggestions? Read more Rate of change of acceleration?February 27, 2012What is the name for rate of change an acceleration? (P. Selvam asked) Answer: The rate of change of acceleration is called Jerk or Jolt Just for info:yank (symbol Y) has been suggested for rate of change of force, tug (symbol T) for rate of change of yank, snatch (symbol S) for rate of change of tug and shake (symbol Sh) for rate of change of snatch. Read more Scientists Agree Again – Light is the Fastest not neutrinoFebruary 26, 2012Year 2012 started with a struggle among the intellectuals and scientists when CERN released the finding that "Neutrinos travel faster than light" But, now the scientists of CERN suspect that it could be an error in measurement of time that caused the faulty calculation. They are blaming the loose connection in Fibre Optic Cables and the GPS signals. A GPS correction applied to the time sensor after triggering the neutrinos could have caused the error in measurement of time. The ex... Read more |
ADITYA KIRAN asks:
“i’ve a beautiful doubt…normally we believe that nothing in dis world can cross cosmic limit…now suppose if 2 light particles(velocity=c) collide at right angles,,then their resultant will be [c*root2]…but that is greater than cosmic limit,right?????”
LET THE VISITORS RESPOND
Categories: Ask Physics Tags: ask Physics, Auto, doubt, Draft, physics, resultant, velocity
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Yes and No. Two particles colliding (or any two objects) obey the rule of energy conservation. That is, the sum of the resultant energy cannot be more than the stored energy you start with. This is why fusion produces particles that obey the light speed maximum with surplus energy represented as heat, light, and other forms of radiation.
The correct formula would look approximately like E=m*c[squared] *2/velocity + E (residual) where residual is in the form of heat etc. By supposition of theorems one could calculate any given mass for any particle or reaction based on the resultants of a reaction. It also begs the question as to whether mass is in fact stored energy as a sum of the starting kinetic energy vectors. If Neutrons and electrons for instance were truly weightless then they would have to be non-existent, since energy is required to raise a particle to a given speed, then by kinetic theory the starting particle must have a mass to require the expenditure of energy to raise it to a certain state or (with kinetics) velocity. Hope this helps.
Which rather begs the question – has CERN got their sums correct? Because if mass is only attributable to the bosun, what happened to the energy expenditures of all the other particles. The main problem with modern quantum physics analysis is that it supposes zero energy = zero temperature, whereas for a moving particle in a vacuum energy is infinite when there is no opposing force. In this scenario, the hypothesis for speed in excess of light speed could be observed but no instrument is capable of measuring it since all instrumentation has to obey principles of the electromagnetic spectrum. You could theoretically calculate a velocity to energy by vectors, but would have no way of proving it unless you could physically travel at such speeds in a time-frame reference. The only modern instrument capable of exhibiting the required phenomenon, albeit at low energy levels, is a gyroscope.
The real clue is in the perception of what heat actually is. In an atom heat can only be transmitted by direct means. There is no heat in the spaces surrounding the particles since these spaces are in fact miniature vacuums. Once scientists model the relationship between heat energy as an expenditure of particles energy only by contact, mass calculations become far more straightforward. Electricity for instance is only the relative movement of two masses of energy with respect to each other along a defined path. Electricity will not flow if there is no energy level to which another energy level can reference itself IE a potential. I know this answer is quite involved, but should at least give you some lines along which to think about your idea.
in follow up to my earlier answer it may help to understand that where energy levels represent a potential difference for the flow of electricity – gravity is the potential difference required for the movement of mass. Think about it.