How Is a Pilot's Apparent Weight Calculated During a Vertical Dive Pullout?

AI Thread Summary
The discussion revolves around calculating the apparent weight of a stunt pilot during a vertical pullout maneuver. The pilot's weight is initially calculated using the formula for weight (W = mg) and considering the acceleration at 3g, but this approach is incorrect without accounting for Earth's gravity. The correct method involves using the centripetal acceleration formula, factoring in both the plane's speed and the radius of the circle. After realizing the need to include Earth's gravity in the calculations, the user successfully finds the correct apparent weight. The key takeaway is the importance of integrating gravitational forces when calculating apparent weight in dynamic scenarios.
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Homework Statement


A 50.0kg stunt pilot who has been diving her airplane vertically pulls out of the dive by changing her course to a circle in a vertical plane.

If the plane's speed at the lowest point of the circle is 95.0m/s, what should the minimum radius of the circle be in order for the acceleration at this point not to exceed 3.00 g?
Correct Answer for that was 307m

Question i need help on is:
What is the apparent weight(in Newtons) of the pilot at the lowest point of the pullout?


Homework Equations



W = mg
g=v^2/r
1g = 9.81

The Attempt at a Solution



I assumed that the easy solution would be to find the weight at 3g's so:
50*3*9.81 = 1471.5

Wasn't accepted as correct answer so i decided to solve it like:
F = ma = m(v^2)/r
50*(95^2)/307 = 1469.9

Also, not taken as the correct answer.


Please let me know what I am missing here
Thanks,
~John
 
Physics news on Phys.org
the acceleration of the plane is 3g, but did Earth's gravity turn off?
 
flatmaster said:
the acceleration of the plane is 3g, but did Earth's gravity turn off?

Ok ok! Its ok everyone! I turned the gravity back on! ^_^

Thank you for the help. I didnt think to add that in there and it worked beautifully
~John
 
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