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3 years ago

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Based on these data, what was true of the world population during this time frame? A. The population size got a bit smaller. OB.

The population got a bit older. C. The number of people added to the population yearly decreased. O d The median age of the population decreased .

1 answer:

Nataly [62]3 years ago

7 0

Answer:B the age did get older

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What is the wavelength of a wave with a frequency of 0.4 kHz traveling at 16 m/s?

larisa86 [58]

Answer: 0.04metres

Explanation:

The wavelength of a wave is the distance covered by the wave after one complete cycle. It is measured in metres, and represented by the symbol λ

Recall that Velocity (V) = Frequency F x wavelength λ

V = F λ

Make λ the subject formula

λ = V / F

In this case Frequency = 0.4 kHz

Convert kilohertz to hertz by multiplying 0.4 by 1000 i.e (0.4 x 1000Hz) = 400Hz

Velocity of wave = 16 m/s

So, λ = V / F

λ = 16 m/s / 400Hz

λ = 0.04metres

Thus, the wavelength of a wave is 0.04metres

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The map of a walking trail is drawn on a coordinate grid with three points of interest. The trail starts at R(−2, 4) and goes to

Zinaida [17]

Answer:

The total length will be "10 units". A further explanation is given below.

Explanation:

The given points are:

R(−2, 4)

S(3, 4)

T(3, −1)

On applying the distance formula,

⇒ $RS=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$

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⇒ $=\sqrt{(3+2)^2+(0)^2}$

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and,

⇒ $ST=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$

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⇒ $=\sqrt{0+(-5)^2}$

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Now,

The total trail length will be:

= $RS+ST$

= $5+5$

= $10 \ units$

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