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IrinaVladis [17]
3 years ago
9

Question 1

Physics
1 answer:
Alexus [3.1K]3 years ago
7 0

Question 1's answer is, if we change the length of the string allowed to vibrate, then the frequency (and pitch) of the string vibration will change. This is because the tension of the string determines the pitch.

Question 2's answer is 2. This can be solved by doing simple division. 30/15 = 2.

Question 3's answer is short bars. Each bar on a xylophone produces a different pitch; the shorter the bar, the higher the pitch.

Hope this helps.

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2 years ago
An airplane has a speed of 135 mi/h in still air. It is flying straight north so that it is always directly above a north-south
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The answer is below

Explanation:

Let vₐ be the speed of airplane = 135 mph, vₙ be the speed of the wind = 70 mph and vₐₙ be the speed of the airplane relative to the wind.

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Therefore, vₐ, vₐₙ, vₙ can be represented by an isosceles triangle since vₐ = vₐₙ.

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a) The direction of the wind is 75° in the south east direction while the airplane is heading 30° in the north east direction.

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