Hi guys I have 2 questions and I need your help please ^__^ 1: Using components determine the sum of + if = 3 m [N30°W] and = 2 m [N10°E]. 2: A force of 3.0 N and 1.0 N act as shown. What is the acceleration of the 6.0 kg mass? http://www2.0zz0.com/2013/10/21/16/491079930.gif 
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Dan 
Hi :) I`m so sorry with the first question 1) 1: Using components determine the sum of a + b if a = 3 m [N30°W] and b = 2 m [N10°E]. And the second question, by using sine and cosine for horizontal and vertical but i don`t know how to sort the solution. :( Thanks a lot for you. 
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Call East the +x axis and North the +y axis. Then we know that a is 3 m long at an angle of 30 degrees above the x axis. So if we draw the usual triangles to get the components we have that a_x =  (3 m)*cos(30) and a_y = (3 m)*sin(30). What are the components of the b vector? Dan 
I`m so sorry for being late :( The components of vector b it will be (2 m)*cos(10) and (2 m)* sin(10) ?! 
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And then a + b will be ???? 
Add a_x and b_x to get the total xcomponent, then add a_y and b_y to get the total ycomponent. The magnitide of the resulting vector is from Pythagoras: sqrt(x^2 + y^2). Its direction is calculated using trig: arctan(angle) = x/y to get angle east or west from north. 
So for a_x will be (3 m)*cos(30) + (2 m)*cos(10) and a_y (3 m)*sin(30) + (2 m)*sin(10) is that right ????!!!! 
I solved the first question guys :) Could you please now help me with the second one ^__^ 
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