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3 years ago

Explain the reason behind why geographers believe the Malthusian theory is not true

Physics

1 answer:

g100num [7]3 years ago

6 0

Answer:

Malthus objection was that the pressure of increasing population on the food supply would destroy perfection and there would be misery in the world.

Malthus was severely criticized for his pessimistic views,which led him to travel to the continent of europe to gather data in support of his thesis

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At 20°c, the resistance of a sample of nickel is 525 ohms. what is the resistance when the sample is heated to 70°C?

Ipatiy [6.2K]

The resistance of the sample is $682.5\Omega$

Explanation:

The relationship between resistance of a material and temperature is given by the equation

$R(T)=R_0(1+\alpha (T-T_0))$

where

$R_0$ is the resistance at the temperature $T_0$

$\alpha$ is the temperature coefficient of resistance

For the sample of nickel in this problem, we have:

$R_0 = 525 \Omega$ when the temperature is $T_0 = 20^{\circ}C$

While the temperature coefficient of resistance of nickel is

$\alpha = 0.006/^{\circ}C$

Therefore, the resistance of the sample when its temperature is

$T=70^{\circ}C$

$R=(525)(1+0.006(70-20))=682.5 \Omega$

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3 0

3 years ago

A geothermal plant has been built in a location. Which of these is the most likely benefit of the geothermal plant in this locat

kramer

Answer:

Explanation:

A and B are not true and D is a disadvantage

4 0

2 years ago

What force cause the rod to become charged

gtnhenbr [62]

Answer:

electricity

If a rod is charged it is because of the electrical force acting on it

6 0

3 years ago

Three strings, attached to the sides of a rectangular frame, are tied together by a knot as shown in the figure. The magnitude o

Anna [14]

The magnitude of the tension in the string marked A is 52.5N

Generally, the equation for is mathematically given as

Let's take θ be an angle at A

So, tanθ = 3/8

Let's take α be an angle at B (Below X)

tanα = 5/4

Let's take β be an angle at C (Below x)

tanβ = 1/6

First we take the Horizontal Components

74.9cos(9.46°) = Acos(20.6°) + Bcos(51.3°)

By solving the equation, we get

A = 78.9 - 0.668B … (1)

Now, we take the vertical components

74.9sin(9.46°) + Asin(20.6°) = Bsin(51.3°)

By solving the equation, we get

40.07 = 1.015B

B = 39.5N

By substituting the value of B in equation (1)

A = 78.9 - 0.6668× 39.5

A = 52.5N

Hence, the magnitude of the tension in the string marked A is 52.5N

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1 year ago

What is a force that opposes motion between two surfaces that are in contact?

choli [55]

Answer:

Friction is a force that opposes motion.

8 0

2 years ago