4 years ago

How do scientists know the Earth’s magnetic field has reversed itself many times in the past?

Physics

1 answer:

erik [133]4 years ago

6 0

Answer:

Changing frequency over time

Explanation:

Changing frequency over time. The rate of reversals in the Earth's magnetic field hasvaried widely over time. 72 million years ago (Ma), the field reversed 5 times in a million years.

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Step2247 [10]

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5 0

3 years ago

8_murik_8 [283]

Answer: 2.61 s

Explanation:

We are given the following data:

$s=5 ft$ is the initial height of the object

$v=40 ft/s$ is the initial height of the object

In addition, the motion of the object is given by:

$h=-16t^{2}+ vt +s$ (1)

Where:

$h=0 ft$ is the final height of the object

$t$ is the time the object is in the air before hitting the ground

Rewritting (1) with the given data:

$0=-16t^{2}+ 40t +5$ (2)

Solving the quadratic equation with the quadratic formula $t=\frac{-b\pm\sqrt{b^{2}-4ac}}{2a}$ , where $a=-16$ , $b=40$ , $c=5$ and choosing the positive value of time: