
#1
May3011, 03:05 PM

P: 72

1. The problem statement, all variables and given/known data
The airspeed of a small plane is 200 km/h. The wind speed is 50.0 km/h [E]. Determine the velocity of the plane relative to the ground if the pilot keeps the plane pointing in each of the following directions. a) East (250 km/h [E] ) b) West (150 km/h [W] ) c) North (206 km/h [N14.0°E]) d) North 40° East (2.4e2 km/h [E41°N] ) 2. Relevant equations Sin Theta = opp/hyp where Theta = 40 deg, Hyp=200. 3. The attempt at a solution The first three are basic. For the fourth obviously, a simple resolution of vectors won't do. If I do, I get 128, while the answer is 240. What am I doing wrong? Sorry to sound so stupid, I am a novice at physics. 



#2
May3011, 04:16 PM

PF Gold
P: 1,054

The Pythagorean method is only useful for adding vectors that form a right angle. What other methods of vector addition have you covered?




#3
May3111, 11:06 AM

P: 72

OK, I got it. Thanks. I have to use the head to tail method.



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