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4 years ago

Does the surrounding air become warm or cool when vapour phase of h2o condenses?explain.

1 answer:

8 0

When the vapor phase of h20 condenses, the surrounding air becomes a little cold since it liberates some amount of heat energy in order to change its phase from the gaseous state (vapor) to the liquid state (droplets of water).

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The author uses dialogue in this excerpt mainly

kipiarov [429]

What’s the rest of this question?

5 0

4 years ago

Using a rope that will snap if the tension in it exceeds 387 N, you need to lower a bundle of old roofing material weighing 449

Anni [7]

Answer:

(a) $a\approx1.4 m.s^{-2}$

(b) $v\approx 4.133 m.s^{-1}$

Explanation:

Given:

Limiting tension of snapping of the rope, T= 387 N

Weight of the object to be lifted, $w=449 N$

∴mass, $\Rightarrow m= 45.8163 kg$

height of letting down the weight, h = 6.1 m

(a)

Now,

The force to be compensated for being on the verge of snapping:

(T-w) = 62 N

Therefore, we need to produce and acceleration equivalent to the above force.

∵ $F=m.a$

$62=45.8163\times a$

$a= \frac{62}{45.8163}$

$a\approx 1.4 m.s^{-2}$

(b)

From the equation of motion ,we have:

$v^{2} =u^{2} +2a.s$ ....................(2)

where:

u= initial velocity= 0 (here, starting from rest)

v= final velocity = ?

$a= 1.4 m.s^{-2}$

s= displacement =h =6.1 m

Now, putting the values in eq. (2)

$v^2= 0^2 + 2\times 1.4\times 6.1$

$v\approx 4.133 m.s^{-1}$ is the velocity with which the body will hit the ground in the given conditions.

7 0

4 years ago

The current in the electron beam of a typical video display terminal is 200 µa. How many electrons strike the screen each minute

noname [10]

The number of electrons strike the screen each minute when thee current in the electron beam of a typical video display terminal is 200 µa is 7.5×10¹⁶.

<h3>How to calculate electric charge?</h3>

Electric charge is equal to the product of electricity current flowing and the total time. It can be given as,

$q=It$

Here, I is current and t is time.

The current in the electron beam of a typical video display terminal is 200 µa for one minute. Thus, the total charge is,

$q=200\times10^{-6}\text{ A}\times(60\text{ s})\\q=0.012\rm \;C$

The number of electron flow is the ratio of total charge to the charge of one electron. The charge on one electron is 1.6×10⁻¹⁹ C. Thus, the number of electron is,

$n=\dfrac{0.012}{1.6\times10^{-19}}\\n=7.5\times10^{16}$

Thus, the number of electrons strike the screen each minute when the current in the electron beam of a typical video display terminal is 200 µa is 7.5×10¹⁶.

Learn more about the electric charge here;

brainly.com/question/2373424

#SPJ4

3 0

3 years ago

The old-fashioned record player had two speeds: one for long-playing albums (LP) and one for singles. The turntable speed for LP

eimsori [14]

Answer:

$\alpha = 0.305 rad/s^2$