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3 years ago

Why is gasoline so flammable

2 answers:

8 0

Flammable and combustible liquids themselves do not burn. It is the mixture of their vapours and air that burns. Gasoline, with a flashpoint of -40°C (-40°F), is a flammable liquid. Even at temperatures as low as -40°C (-40°F), it gives off enough vapour to form a burnable mixture in air.

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liq [111]3 years ago

7 0

It is flammable because of the low flashpoint. Gasoline's flashpoint is -40 degrees Fahrenheit, which essentially means that the vapors released into the oxygenated air can be lit ablaze in low temperatures.

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A stone is thrown vertically upwards with an initial velocity of 20m/sec. Find the maximum height ot reaches and the time taken

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Answer:

The height reached is 20m, The time taken to reach 20m is 2 seconds

Explanation:

Observing the equations of motion we can see that the following equation will be most helpful for this question.

$v^{2} = u^{2} + 2as$

We are given initial velocity, u

We know that the stone will stop at its maximum height, so final velocity, v

Acceleration, a

And we are looking for the displacement (height reached), s

Substitute the values we are given into the equation

$0^{2} = 20^{2} + 2(10)s$

Rearrange for s

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$\frac{-400}{20} =s$

s = -20 (The negative is just showing direction, it can be ignored for now)

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Use a different equation to find the time taken

$s = vt - \frac{1}{2} at^{2}$

Substitute in the values we have

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Rearrange for t

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