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3 years ago

Derek is watching a thunderstorm. He hears the thunder 4.7 s after seeing a flash of lightning. How far away was the lightning?

Mathematics

1 answer:

statuscvo [17]3 years ago

4 0

Answer:

1.0014 Miles

Step-by-step explanation:

The light travels at 186,291 miles per second (~300,000 km/s), and speed of sound in dry air is equal to 0.21 - 0.22 miles per second (0.33-0.35 km/s), as it varies with the temperature. We can notice the lightning almost immediately even though the storm is far from us, but the thunder needs around 5 seconds to travel one mile and approximately 3 seconds to travel one kilometer. Thanks to this seven orders of magnitude difference in sound and light propagation, we can easily estimate the storm distance

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sukhopar [10]

The answer is 0.616 bucket of fish.

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3 years ago

You want to buy a pet rabbit that costs $49. You already have $18 and you plan to save $9 per week. If w represents the numbe

kap26 [50]

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3 years ago

20 - (-3) + 15 help a girl outt :(

Kryger [21]

Answer is 38

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3 years ago

Read 2 more answers

Help me with problem 2 please

e-lub [12.9K]

Answer:

Second choice, 11/30

Step-by-step explanation:

38 + 22 = 60

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2 years ago

Find the sum and product of the roots. 2x^2 + 6x - 8 = 0

netineya [11]

Suppose you can factorize:

$ax^2+bx+c=a(x-r_1)(x-r_2)$

Then by expanding the right side, you have

$ax^2+bx+c=a(x^2-(r_1+r_2)x+r_1r_2)=ax^2-a(r_1+r_2)x+ar_1r_2$

which means in this case, you have to have

$\begin{cases}6=-2(r_1+r_2)\\-8=2r_1r_2\end{cases}\implies\begin{cases}r_1+r_2=-3\\r_1r_2=-4\end{cases}$

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3 years ago