Physics, 26.07.2019 05:00 genyjoannerubiera

How could tesla or anybody else light up a light just by holding it

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Answer from: marendt2014

The ordinary light bulb that we use in everyday life is either LED (containds small light emiting diods) or it contains a wire that is heated to a high temperature and as a result light is produced.

For his demonstrations Tesla used bulbs that did not contain any part inside. Instead of any part there was a gas inside. These type of bulbs are still used. Their main advantage is that they do not require much energy to produce light.

Inside his light-bulbs Tesla and others put a noble gas such as neon, xenon and argon. Also, sometimes there was a phosphorus on the outside part of a light-bulb. When this light-bulb is brought into electromagnetic field it produces light. This happens due to foto-electric induction. When gas is positioned inside EM field gas gets exited. This causes for electrons to jump out of their positions and emit light. This can be achieved wirelesly as long as EM field is strong enough.

Answer from: Quest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

Answer from: Quest

Ireally just need to get finished with precal! i’m really sorry i have to do this! hope this !

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