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3 years ago

Which scenario would result in a decrease in population size, or a negative population growth?

Physics

2 answers:

Anestetic [448]3 years ago

5 0

I’m pretty sure the answer is b

Luba_88 [7]3 years ago

5 0

Answer:

The correct answer is option B.

Explanation:

Using Formula:

Population growth = (birth rate + immigration) – (death rate + emigration)

A) Birth rate = 14

Immigration = 14

Death rate = 14

Emigration = 0

Population growth = (14 + 14) – (14 + 0)= 14

B) Birth rate = 10

Immigration = 28

Death rate = 0

Emigration = 40

Population growth = (10 + 28) – (0 + 40)= -2

C) Birth rate = 17

Immigration = 0

Death rate = 5

Emigration = 12

Population growth = (17 + 0) – (5 + 12)= 0

D) Birth rate = 25

Immigration = 0

Death rate = 4

Emigration = 19

Population growth = (25 + 0) – (4 + 19)= 2

Scenario (B) would result in a decrease in population size, or a negative population growth.

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Which type of electromagnetic waves make up the colors of a rainbow seen after a storm?

Step2247 [10]

Visible light waves are the type of electromagnetic waves that make up the colors of the rainbow, because the rainbow is visible to us.

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3 years ago

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Three beads are placed along a thin rod. The first bead, of mass m1 = 23 g, is placed a distance d1 = 1.1 cm from the left end o

Mila [183]

Answer:

a) $x=\frac{m_{1}d_{1}+m_{2}(d_{1}+d_{2})+m_{3}(d_{1}+d_{2}+d_{3} ) }{m_{1}+m_{2}+m_{3} }$

b) x = 4.47 cm

c) $x=\frac{m_{1}d_{2}+m_{2}(0)+m_{3}d_{3} }{m_{1}+m_{2}+m_{3} }$

d) x = 1.48 cm

Explanation:

a) The center of mass is equal to:

$x=\frac{m_{1}x_{1}+m_{2}x_{2}+m_{3}x_{3} }{m_{1}+m_{2} +m_{3}}$

Where m is the mass of beads and x is the distances, if x₁ = d₁, x₂ = d₂ and x₃ = d₃

$x=\frac{m_{1}d_{1}+m_{2}(d_{1}+d_{2})+m_{3}(d_{1}+d_{2}+d_{3} ) }{m_{1}+m_{2}+m_{3} }$

b) If

m₁ = 23g

m₂ = 15 g

m₃ = 58 g

d₁ = 1.1 cm

d₂ = 1.9 cm

d₃ = 3.2 cm

$x=\frac{23*1.1+15*(1.1+1.9)+58(1.1+1.9+3.2) }{23+15+58 } =4.47cm$

c) The center of the mass of the beads realtive to the center of bead is:

$x=\frac{m_{1}d_{2}+m_{2}(0)+m_{3}d_{3} }{m_{1}+m_{2}+m_{3} }$

d) $x=\frac{23*(-1.9)+(15*0)+(58*3.2) }{23+15+58 } =1.48cm$

6 0

3 years ago

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Two concrete spans of a 380 m long bridge are

Mazyrski [523]

Answer:

4.163 m

Explanation:

Since the length of the bridge is

L = 380 m

And the bridge consists of 2 spans, the initial length of each span is

$L_i = \frac{L}{2}=\frac{380}{2}=190 m$

Due to the increase in temperature, the length of each span increases according to:

$L_f = L_i(1+ \alpha \Delta T)$

where

$L_i = 190 m$ is the initial length of one span

$\alpha =1.2\cdot 10^{-5} ^{\circ}C^{-1}$ is the temperature coefficient of thermal expansion

$\Delta T=20^{\circ}C$ is the increase in temperature

Substituting,

$L_f=(190)(1+(1.2\cdot 10^{-5})(20))=190.0456 m$

By using Pythagorean's theorem, we can find by how much the height of each span rises due to this thermal expansion (in fact, the new length corresponds to the hypothenuse of a right triangle, in which the base is the original length of the spand, and the rise in heigth is the other side); so we find:

$h=\sqrt{L_f^2-L_i^2}=\sqrt{(190.0456)^2-(190)^2}=4.163 m$

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3 years ago

Who was the carthaginian general who used elephants to cross the alps in the second punic war

goldfiish [28.3K]

<span>the answer is Hannibal</span>

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3 years ago

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A student has designed a circuit with one battery, two light bulbs, and two switches, pictured to the left. She would like for e

Gnoma [55]

Answer:

The bulb is not powered because the negative end of the battery is not connected to the electric current,making it dysfunctional. The electrons have to flow through the positive and negative ends of the battery in order for it to work.

Hope this helps.

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3 years ago

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