Why is it a good idea to touch a metal pole, or similar conductor, before filling up a car with gas?

2 answers:

8 0

It is good idea to touch a metal pole or conductor before filling the car with gas because of danger conditions generated while filling which because of the static discharge of current causing spark.

<u>Explanation: </u>

The static discharge of current can be passed while filling up the car with gas which will cause generation of electricity and hence the spark is ignited which can be fatal due to the combustion of the gas.

alexandr1967 [171]3 years ago

6 0

Answer:

because it form static electricity which can cause fire so it is good to touch a metal pole or similar conducter because they will help us to pass the current in the ground

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Answer:

R=4.22*10⁴km

Explanation:

The tangential speed $v$ of the geosynchronous satellite is given by:

$v=\frac{2\pi R}{T}$

Because $2\pi R$ is the circumference length (the distance traveled) and T is the period (the interval of time).

Now, we know that the centripetal force of an object undergoing uniform circular motion is given by:

$F_c=\frac{mv^{2} }{R}$

If we substitute the expression for $v$ in this formula, we get:

$F_c=\frac{m(\frac{2\pi R}{T})^{2}}{R}=\frac{4m\pi ^{2}R}{T^{2}}$

Since the centripetal force is the gravitational force $F_g$ between the satellite and the Earth, we know that:

$F_g=\frac{GMm}{R^{2}}\\\\\implies \frac{GMm}{R^{2}}=\frac{4m\pi ^{2}R}{T^{2}}\\\\R^{3}=\frac{GMT^{2}}{4\pi^{2}} \\\\R=\sqrt[3]{\frac{GMT^{2}}{4\pi^{2}} }$

Where G is the gravitational constant ( $G=6.67*10^{-11} Nm^{2}/kg^{2}$ ) and M is the mass of the Earth ( $M=5.97*10^{24}kg$ ). Since the period of the geosynchronous satellite is 24 hours (equivalent to 86400 seconds), we finally can compute the radius of the satellite: