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3 years ago

In the past, how did people use the systematic movement of celestial bodies? Select all that apply.

2 answers:

7 0

In past, people used the systematic movement of celestial bodies for making agricultural decisions, shipping navigation and for spiritual and religious practices.

Answer: Options 1, 2, and 4

Explanation:

The observation of systematic movement of celestial bodies comes under the field of Astrometry. The celestial mechanics which defines are the movement of celestial bodies is also a kind of Astrometry.

The celestial mechanics is used by the people in past to help in navigation during ship journey. Even the astrometry will help in predicting the seasons to be coming which will help in making agricultural decisions.

In astrology, the position of celestial bodies help in deciding the time for spiritual and religious practices. So, in ancient days, people used the systematic movement of celestial bodies in naked eyes to decide these.

vredina [299]3 years ago

5 0

The answer is actually a,b, and d
Brainliest?

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Explanation:

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3 years ago

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3 years ago

A certain car can accelerate from 0 to 60 mph in 7.9 s. What is the car's average acceleration in mph/s?

Anna007 [38]

Answer:

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Explanation:

Motion With Constant Acceleration

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a = acceleration

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3 years ago

An elastic conducting material is stretched into a circular loop of 9.65 cm radius. It is placed with its plane perpendicular to

Nadya [2.5K]

Answer:

The induced emf in the coil is 0.522 volts.

Explanation:

Given that,

Radius of the circular loop, r = 9.65 cm

It is placed with its plane perpendicular to a uniform 1.14 T magnetic field.

The radius of the loop starts to shrink at an instantaneous rate of 75.6 cm/s , $\dfrac{dr}{dt}=-0.756\ m/s$

Due to the shrinking of radius of the loop, an emf induced in it. It is given by :

$\epsilon=\dfrac{-d\phi}{dt}\\\\\epsilon=\dfrac{-d(BA)}{dt}\\\\\epsilon=B\dfrac{-d(\pi r^2)}{dt}\\\\\epsilon=2\pi rB\dfrac{dr}{dt}\\\\\epsilon=2\pi \times 9.65\times 10^{-2}\times 1.14\times 0.756\\\\\epsilon=0.522\ V$

So, the induced emf in the coil is 0.522 volts.

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3 years ago