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3 years ago

How is magnetism important to our evolution?

1 answer:

4 0

If it helps Mark Brainliest.. :)

natural magnetism of the Earth derives from its iron core. This not only provides a useful direction finder for compasses, but actually protects life on Earth by deflecting charged particles in space. The "magnetosphere" is a large region that surrounds the Earth as it moves in its orbit around the Sun. It consists of charged ions that are prevented from directly striking the surface, where they could injure living organisms and harm the environment.When solar eruptions on the Sun increase the flow of charged particles, industries such as power transmission and communication can be still be affected despite the magnetic field

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Help me please i need this to passsss

mamaluj [8]

Answer: D

Explanation: : ⊇

6 0

3 years ago

A ductile metal wire has resistance R. Then the wire is stretched to three times its original length. The stretching shrinks the

Ivenika [448]

Explanation:

Let us assume that the final resistance after stretching is $R_{f}$ . Since, the volume of rod does not change and the initial and final volume will be the same as follows.

V = $V_{f}$

$LA = L_{f}A_{f}$

It is given that, $L_{f} = 3L$ .

Therefore, $LA = L_{f}A_{f}$

$LA = 3LA_{f}$

$A_{f} = \frac{A}{3}$

We know that relation between resistance and area is as follows.

R = $\frac{\rho L}{A}$

$R_{f} = \frac{\rho L_{f}}{A_{f}}$

= $\frac{\rho (3L)}{\frac{A}{3}}$

= 9 $(\frac{\rho L}{A})$

= 9R

Thus, we can conclude that the resistance of the stretched wire is 9R.

8 0

3 years ago

Read 2 more answers

1. Name two ways of applying forces ?

Anna007 [38]

Answer: A force can be applied to another object by a direct push, pull, or drag.

Explanation:

4 0

3 years ago

Read 2 more answers

Which data set has the smallest standard deviation?

hjlf

Answer:

B. 22,22,23,23,22,22,23

Explanation:

The standard deviation is a measure of dispersion or variability of a data set. In order to determine the data set that has the smallest standard deviation, we shall investigate on the ranges of the data sets given. The range of a data set is simply the difference between the maximum and minimum values in a data set. A data set that has a smaller range also has a smaller standard deviation.

From the alternatives given, the data set given by alternative B has the smallest range and consequently the smallest standard deviation.

The maximum value is 23 while the minimum is 22. The range is 1.

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3 years ago

A student is playing with a pendulum. He gives the ball a push and watches the ball as it swings. After a while, the ball stops

julia-pushkina [17]

A because it’s not good

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3 years ago