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Ray Of Light [21]
3 years ago
12

In the Landolt-C acuity test, the average threshold for accurately identifying the position of the gap in the C-like character w

as 0.75mm in size, at a distance of 3000mm. What angle is subtended by the gap at this acuity threshold? Show your working and give your answer in Minutes of arc.
Biology
1 answer:
Stella [2.4K]3 years ago
4 0

Answer:

  0.859 minutes of arc

Explanation:

The arc length for a given radius and angle in radians is ...

  s = rθ

So, the angle is ...

  θ = s/r

For the given geometry, the angle in radians is ...

  θ = (0.75 mm)/(3000 mm) = 0.00025 radians

In minutes of arc, this is ...

  (0.00025 radians)(60 minutes/degree)(180 degree/(π radians)

  = (0.0025)(60)(180)/π minutes

  ≈ 0.859 minutes

The angle subtended is about 0.859 minutes of arc.

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0.5*2*(2^2)= 4J
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Q8b-

at the max height, all the kinetic energy is converted to potential energy, 

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that theory would apply if you wanted to work out the maximum height achieved if the balls were thrown upward by rearranging. But, we are simply working out which ball will have more potential energy so:

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Answer:

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Explanation:

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