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denis-greek [22]

3 years ago

5

Why do we feel cool when we spray perfume in our body

2 answers:

Lina20 [59]3 years ago

7 0

Answer:

We feel cooler when we spray perfume on our body because the perfume requires latent heat of vaporisation to change its state of matter from liquid to gas and this latent heat is provided by our body. Our body loses heat as it gives its heat in converting perfume from liquid to gas. Hence our body loses heat and becomes cooler.

Hope this helps ;-))

PLEASE CAN YOU GIVE ME BRAINLIEST

KiRa [710]3 years ago

5 0

Because the perfume is sprayed as a fine mist. This exposes a lot of its surface area to air, causing it to evaporate quickly. That makes us feel cooler.

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Si un cuerpo adquiere una carga de -0,02 C, ha ganado o ha perdido electrones? Cuantos?

sammy [17]

Question :

If a body acquires a charge of -0.02 C, has it gained or lost electrons? Many?

Solution :

We know, charge gained is shown by negative sign.

Since, charged acquired is given as -0.02 C .

Therefore, it is body has gained electrons.

Now, number of electrons is given by :

$n = \dfrac{net\ charge}{charge \ on \ one \ electron}\\\\n = \dfrac{-0.02}{-1.60 \times 10^{-19}}\\\\n = 1.25\times 10^{17}$

Hence, this is the required solution.

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3 years ago

find the period of a simple pendulum of 1m length placed on earth and on moon g on moon =1.67m/s² g on earth=10m/s²

Ierofanga [76]

Answer:

$T_{m }$ = 4.86 s

$T_{e}$ = 1.98 s

Explanation:

<u><em>Given:</em></u>

Length = l = 1 m

Acceleration due to gravity of moon = $g_{m}$ = 1.67 m/s²

Acceleration due to gravity of Earth = $g_{e}$ = 10 m/s²

<u><em>Required:</em></u>

Time period = T = ?

<u><em>Formula:</em></u>

T = 2π $\sqrt{\frac{l}{g} }$

<u><em>Solution:</em></u>

<u>For moon</u>

<em>Putting the givens,</em>

T = 2(3.14) $\sqrt{\frac{1}{1.67} }$

T = 6.3 $\sqrt{0.6}$

T = 6.3 × 0.77

T = 4.86 sec

<u>For Earth,</u>

<em>Putting the givens</em>

T = 2π $\sqrt{\frac{1}{10} }$

T = 2(3.14) $\sqrt{0.1}$

T = 6.3 × 0.32

T = 1.98 sec

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