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Akimi4 [234]
3 years ago
12

In a thunderstorm at 20.0°C, Karen sees a bolt of lightning and hears the thunderclap 3.00 s later. How far from Karen did the l

ightning strike? Show your work.
Please be sure to show all work. Thank you so much :D
Physics
1 answer:
Minchanka [31]3 years ago
7 0
-- The speed of light in air is very close to 3 x 10⁸ m/s.
Whatever the actual number is, it's equivalent to roughly
7 times around the Earth in 1 second.  So for this kind of
problem, you can assume that we see things at the same time
that they happen; don't bother worrying about how long it takes
for the light to reach you.

-- For sound, it's a different story.  Sound in air only travels at
about 340 m/s.  It takes sound almost 5 seconds to go 1 mile.

-- Now, the lightning and thunder happen at the same time.
The light travels to you at the speed of light, so you see the
lightning pretty much when it happens.  But the sound of the
thunder comes poking along at 340 m/s, and arrives AFTER
the sight of the lightning.

The length of time between the sight and the sound is about
99.9999% the result of the time it takes the sound to reach you.

If the thunder arrived at you 3 seconds after the light did, then
the sound traveled
        
                     (340 m/s) x (3 s) =  1,020 meters .
                                           
(about 0.63 of a mile)

(If you're worried about ignoring the time it takes
for the light to reach you ...

  It takes light  0.0000034 second to cover the same 1,020 meters,

so including it in the calculation would not change the answer.)

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A car speeds up while the engine delivers constant power. Is the acceleration greater at the beginning of this process or at the
dsp73

Answer:

The acceleration greater at the beginning of this process

Explanation:

The car when starting to move is necessary an acceleration therefore at the beginning of the movement there is an acceleration. The engine power is at a constant value so that when the car reaches the maximum speed (constant speed) at that power there will be no acceleration.

That is to say, at constant speed = zero acceleration

And of course this final null acceleration will be less than the initial acceleration so that the car starts to move .

4 0
3 years ago
A series circuit has four resistors. The current through one resistor is 810 mA. How much current is supplied by the
Serhud [2]

Answer:

Correct answer:  810 mA

Explanation:

In the series connection of a resistor,the current flowing through one resistor is the same through all four resistors and therefore throughout the entire electrical circuit.

God is with you!!!

8 0
3 years ago
Why is water always used in energy generation (water -> steam -> turbine) instead of a liquid with a lower specific heat c
frez [133]

There are multiple reasons for this. First of all, water is available in almost every place on the Earth. It doesn't pollute the air, doesn't cause health use and is easily handle.

Other factor is the fact that water has a really high specific heat. This means that water, and more specifically steam, can aborb and transport more energy. A lower heat capacity would imply the need to boil more of the liquid to obtain the same amount of energy. This combine with the fact that water expands at a large rate when boiling, combine with everything mentioned previously, and you get a liquid with all the characteristics that a efficient turbine requires to work.

8 0
3 years ago
Which airplane has more potential energy, a boeing 787 dreamliner having a mass of 2,450kg at 11,500 m above Earth, or a boeing
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Explanation:

For 787 dreamliner airplane,

Mass, m_1=2450\ kg

Height, h_1=11500\ m

Potential energy of 787 dreamliner airplane is given by :

E_1=m_1gh_1\\\\E_1=2450\times 9.8\times 11500\\\\E_1=2.76\times 10^8\ J

For a boeing 747,

Mass, m_2=3150\ kg

Height, h_2=9000 \ m

:

Potential energy of a boeing 747 airplane is given by

E_2=m_2gh_2\\\\E_2=3150\times 9.8\times 9000\\\\E_2=2.77\times 10^8\ J

So, the potential energy of a boeing 747 airplane is more than the 787 dreamliner airplane.

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The right answer for the question that is being asked and shown above is that: "d. electrical to electromagnetic." the type of energy transfer is made possible by a nine-volt battery in a calculator is that of d. electrical to electromagnetic<span>
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