3 years ago

Plz HELP

Physics

1 answer:

zubka84 [21]3 years ago

3 0

The 2nd has the most porosity

Infiltration

That's all I can answer for you. Hope it helps

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True or false? Nitrogen in the atmosphere is responsible for clouds and precipitation? If not what is?

Flura [38]

A.)

False

There reason why it's false is because Nitrogen is not responsible for clouds and precipitation. The real answer is that Water (Ocean / Other) is responsible for clouds and precipitation.

Good Day / Night :D

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3 years ago

Compute the dot product of the vectors u and v, and find the angle between the vectors. Bold v equals 7 Bold i minus Bold j and

OLga [1]

Answer:

$\theta = 106.3 degree$

Explanation:

As we know that

$\vec w = -\hat i + 7\hat j$

$\vec v = 7\hat i - \hat j$

also we know that

$\vec v. \vec w = -14$

it is given as

$\vec v. \vec w = (-\hat i + 7\hat j).(7\hat i - \hat j)$

$\vec v. \vec w = - 7 - 7 = -14$

also we can find the magnitude of two vectors as

$|v| = \sqrt{(-1)^2 + (7)^2}$

$|v| = \sqrt{50}$

similarly we have

$|w| = \sqrt{(7^2) + (-1)^2}$

$|w| = \sqrt{50}$

now we know the formula of dot product as

$\vec v. \vec w = |v||w| cos\theta$

$-14 = (\sqrt{50})^2cos\theta$

$\theta = cos^{-1}(\frac{-14}{50})$

$\theta = 106.3 degree$

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3 years ago

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The answer is, 5630 seconds.

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2 years ago

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Unlike velocity, speed is scalar, which means it is described by ______ only.

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Hi there,

Unlike velocity,speed is scalar,which means it is described by MAGNITUDE only.

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Sergeu [11.5K]

Answer:

1500 m/s

Explanation:

Recall that for a wave,

Speed = frequency x wavelength

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simply substitute into above equation

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3 years ago