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1 year ago

Two students are talking in the corridor you can hear them in your class but you cannot see them why?

Physics

1 answer:

BaLLatris [955]1 year ago

4 0

You can hear two students talking in the corridor first, then see them due to the speed of sound.

The speed of sound is the distance that sound energy will propagate per unit of time through a medium. At room temperature, the speed of sound in air is about 1125 ft/s (343 m/s).

The speed of sound varies from substance to substance in function of the material density, elasticity and temperature. Typically sound travels most slowly in gases (like air 343 m/s), faster in liquids (like water 1481 m/s) and fastest in solids (like iron 5120 m/s).

<h3>What is velocity?</h3>

It is a physical quantity that indicates the displacement of a mobile per unit of time, it is expressed in units of distance per time, for example (miles/h, km/h).

Learn more about velocity at: brainly.com/question/3004254

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In a simple RC circuit, at t=0 the switch is closed with the capacitor uncharged. If C=30µF, =50V and R=10k, what is the poten

sergij07 [2.7K]

Answer:

Voltage across the capacitor is 30 V and rate of energy across the capacitor is 0.06 W

Explanation:

As we know that the current in the circuit at given instant of time is

i = 2.0 mA

R = 10 k ohm

now we know by ohm's law

$V = iR$

$V = (2 mA)(10 kohm)$

$V = 20 volts$

so voltage across the capacitor + voltage across resistor = V

$V_c + 20 = 50$

$V_c = 30 V$

Now we know that

$U = \frac{q^2}{2C}$

here rate of change in energy of the capacitor is given as

$\frac{dU}{dt} = \frac{q}{C} \frac{dq}{dt}$

$\frac{dU}{dt} = (30)(2 mA)$

$\frac{dU}{dt} = 0.06 W$

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