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Effectus [21]
3 years ago
13

How has human population growth change over time

Physics
2 answers:
skad [1K]3 years ago
7 0

Human population growth has gotten larger and larger as time goes on. The first 1 billion people were in 1803. It has taken 120 years to get to another billion people. It is changing by 80 million people born a year. At 10 billion, we will most likely fall short of food supply due to the overpopulation.

Anuta_ua [19.1K]3 years ago
4 0

The figure “Future of World Population Growth” illustrates three scenarios for population change, depending on levels of fertility. World population is projected to increase to 8 billion by 2025 and to reach 9.2 billion by 2050 according to the medium scenario where fertility reaches 2.0 children per women.

hope this helps

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"Chief accelerator" is an American idiom. The term "communist virus" must also have come from the United States. Since the outbr
Bas_tet [7]

Answer:

What's the question?

Explanation:

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4 0
3 years ago
A compound microscope is equipped with two objective lenses (10x and 45x) and has a 10x ocular lens. The highest magnification a
Wittaler [7]

Answer:

450X

Explanation:

When a specimen is been viewed, both

objective and ocular lenses works together so that the object is magnified.

From the question,objective lenses are;

1)10x

2)45x

ocular lens= 10x

Highest magnification

= 10X ocular × 45X objective

=450X

This implies that the image that was viewed will appear 450 times the actual size.

5 0
3 years ago
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Irina18 [472]

mv'=(M+m)v

v'=d/t

v=x/t

m'=M/2

Md/2t=(M+M/2)x/t

Md/2=3Mx/2

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8 0
3 years ago
A 2 kg block is pushed by an external force against a spring with spring constant 131 N/m until the spring is compressed by 2.1
Andrej [43]

Answer:

   d = 19.92 m

Explanation:

As in this exercise there is friction we must use the relationship between work and energy

          W = ΔEm

Look for energy in two points

Initial. Fully compressed spring

          Em₀ = K_{e} = ½ k x²

Final. When the block stopped

      Em_{f} = 0

Let's look for the work of the rubbing force

       W = fr d cos θ

Since rubbing is always contrary to movement, θ = 180

      W = - fr d

Let's use Newton's second Law, to find the force of friction

Y Axis

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The equation for the force of friction is

         fr = μ N

         fr = μ mg

We substitute in the work equation

          W = - μ m g d

We write the relationship of work and energy

     -μ m g d = 0 - ½ k x²

     d = ½ k x² / μ m g

Let's calculate

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     d = 19.92 m

7 0
4 years ago
What is Newton’s 3rd Law of Motion?
sasho [114]

Answer:

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Explanation:

5 0
3 years ago
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