General Magnetism Question - ATPL
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Joined: Nov 2006
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From: Washington
General Magnetism Question - ATPL
Please help me with this one.
Q. Z is 45 and the T value is 76 units. The values of dip and force H will be:
a) 36.3 61
b) 53.7 61
c) 59.5 66
d) 61.3 36
The correct answer mentioned is a). But I have trouble figuring out the values. For reference:
tan dip = Z/H
and T = H/cos dip
Taken from Ground Studies for Pilots - Navigation page 48 example 7.
Thanks...
Q. Z is 45 and the T value is 76 units. The values of dip and force H will be:
a) 36.3 61
b) 53.7 61
c) 59.5 66
d) 61.3 36
The correct answer mentioned is a). But I have trouble figuring out the values. For reference:
tan dip = Z/H
and T = H/cos dip
Taken from Ground Studies for Pilots - Navigation page 48 example 7.
Thanks...
Joined: May 1999
Aviation Qualifications: ATP+Mil
Posts: 27,394
Likes: 856
From: Quite near 'An aerodrome somewhere in England'
tan dip = Z/H
H = T cos dip
therefore (tan dip x cos dip) = Z/T
since tan x cos = sin,
sin dip = Z/T; dip = arcsin 0.5921 = 36.3
H = 76 x cos 36.3 = 61.2
So I would say that a) is indeed the correct answer - although I have no idea what the subject is about. Just basic trigonometry and algebra - it is the wont of the JAA to ask rather pointless questions....and answer d) is a deliberate ploy to ensure you RTFQ!
H = T cos dip
therefore (tan dip x cos dip) = Z/T
since tan x cos = sin,
sin dip = Z/T; dip = arcsin 0.5921 = 36.3
H = 76 x cos 36.3 = 61.2
So I would say that a) is indeed the correct answer - although I have no idea what the subject is about. Just basic trigonometry and algebra - it is the wont of the JAA to ask rather pointless questions....and answer d) is a deliberate ploy to ensure you RTFQ!
