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3 years ago

Instrument used to measure the length of a football field

Physics

1 answer:

r-ruslan [8.4K]3 years ago

6 0

Answer:

If you need to measure much longer lengths - for example the length of a football pitch - then you could use a trundle wheel. You use it by pushing the wheel along the ground. It clicks every time it measures one metre.

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3 years ago

An airplane engine starts from rest; and 2 seconds later, it is rotating with an angular speed of 300 rev/min. if the angular ac

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3 years ago

When monochromatic light passes through the interface between two unknown materials at an angle θ where 0∘<θ<90∘, no chang

kirill115 [55]

Answer:

the correct one is the first, the refractive index of the two materials must be the same

Explanation:

When a beam of light passes through two materials, it must comply with the law of refraction

n₁ sin θ₁ = n₂ sin θ₂

where n₁ and n₂ are the refractive indices of each medium.

In this case, it indicates that the light does not change direction, so the input and output angle of the interface must be the same,

θ₁ = θ₂ = θ

substituting

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therefore the refractive index of the two materials must be the same

When reviewing the answers, the correct one is the first

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3 years ago

Instrument used to measure the length of a football field​

Instrument used to measure the length of a football field