If long sight means farsighted, then here's your answer:
Farsightedness is when the lens has difficulty focusing on nearby objects. Sufferers must squint to see the nearby objects. Reading, writing, and drawing for longer periods of time can cause eyestrain and headache.
Being farsighted can be corrected with prescription glasses or contact lenses or surgery.
<span>The correct answer for this question is this one:
"The wing tip is moving around a circle at a constant speed. And it says that the acceleration is centripetal. It moves a distance that is equal to the circumference of a circle, as </span>the wing makes a complete circle<span>. The radius of the circle is equal to one half of the wingspan.
</span>Circumference = 2 * π * 6.6 = π * 13.2
<span>To determine the velocity, divide this distance by 22 seconds. </span>
<span>v = π * 13.2 ÷ 22 </span>
<span>This is approximately 1.885 m/s. </span>
<span>Centripetal acceleration = (π * 13.2 ÷ 22)^2 ÷ 6.6 </span>
Answer : distance, d = 463.7 m
Explanation :
According to the given condition it can be assumed that the first echo would be heard from closest cliff. The second echo is from farther cliff and the third echo is from the reflection between the two cliffs.
Let the distance between the first cliff and the point of firing is x and y is the distance between the second cliff and the point of firing.
Then the first echo will travel 2x distance, second will travel 2y distance and third will travel 2x +2y.
So, using above data :
and
On solving :
x = 321.9 m and y = 141.8 m
Hence, total distance between two cliffs is d = 321.9 m + 141.8 m = 463.7 m