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nataly862011 [7]
3 years ago
10

Helicopter blades withstand tremendous stresses. In addition to supporting the weight of a helicopter, they are spun at rapid ra

tes and experience large centripetal accelerations, especially at the tip. Calculate the centripetal acceleration at the tip of a 4.20 m long helicopter blade that rotates at 270 rev/min.
Compare the linear speed of the tip with the speed of sound (taken to be 340 m/s), i.e., calculate the ratio of the linear speed over speed of sound.
Physics
1 answer:
ella [17]3 years ago
6 0
A.) 
<span>(Centripetal Acceleration) = (radius)*(angular velocity)^2 </span>
<span>325 rev/min = 34.0339204 radians/second </span>
<span>(Centripetal Acceleration) = (4.00 m)*(34.0339204 radians/second)^2 </span>
<span>(Centripetal Acceleration) = 4 633.23095 meters/second^2 </span>

<span>b.) </span>
<span>(tangential velocity) = sqrt((centripetal acceleration)*(radius)) </span>
<span>just plug them in and get a velocity, then divide that by 340 m/s to get your percentage of the speed of sound, so if you get for example 680, that would be twice the speed of sound or Mach 2</span>
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Answer:

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Explanation:

A) To solve this, we will use the lens equation formula;

1/f = 1/d_o + 1/d_i

Where;

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1/0.2 = 1/d_o + 1/6

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1/d_o = 4.8333

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d_o = 0.207 m

d_o = 20.7 cm

B) to solve this, we will use the magnification equation;

M = h_i/h_o = d_i/d_o

Where;

h_o = 3.5 cm = 0.035 m

d_i = 6 m

d_o = 20.7 cm = 0.207 m

Thus;

h_i = (6/0.207) × 0.035

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