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31 October, 02:50

According to the theory of relativity, the mass m of a particle depends on its velocity v. Consider the following equation, where m0 is the mass when the particle is at rest and c is the speed of light.

m = m0 / [√1 - (v2/c2) ]

Find the limit of the mass as v approaches c -.

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  1. 31 October, 04:17
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    Yes. There we have it. That's why nothing with mass can keep

    speeding up until it reaches the speed of light.

    As 'v' approaches 'c',

    - - the fraction (v²/c²) approaches ' 1 ',

    - - the quantity inside the square root approaches (1 - 1) which is zero,

    - - since the square root is in the denominator of the fraction,

    the fraction gets bigger and bigger, approaching infinity,

    and so does 'm' ... the mass of the object that's moving

    faster and faster.

    The closer the object comes to the speed of light, the greater

    its mass becomes, and the more energy it takes to make it move

    still faster. If the object has ANY mass when it's at rest, then it

    takes an infinite amount of energy to push it to light speed.

    By the way ... as unbelievable as it seems, this weird formula

    has been tested and proved thousands of times, and there's no

    doubt at all that it really happens. The faster something moves,

    the bigger its mass gets. It's observed every day in experiments

    where things move really fast ... like subatomic particles in an

    accelerator. Their mass really does grow when they get going.
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