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Another Magnitude and Direction of resultant force ? 
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#1
Feb2310, 09:10 PM

P: 16

I'm having issues on the second question. I feel that I'm missing some information. Since the lines are perpendicular do I consider one force (10N) at 90 degrees North? And if this is the case then is the other force (15N) at __ degrees East and solve with the second equation below?
1. The problem statement, all variables and given/known data A  Consider two forces, one having a magnitude of 10N, and the other having a magnitude of 15N. What maximum net force is possible when combining these two forces? What is the minimum net force possible? GOT THIS PART B  If the forces given in a) above are perpendicular to each other, what will be the magnitude and direction of the resultant force? Given by prof ...requires vector addition. 2. Relevant equations R = sqrt(A^2 + B^2) Ax = cosA, Ay = sinA tan = y/x 3. The attempt at a solution Max Net Force 10 N + 15 N = 25 N Min Net Force 10 N  15 N = 5 N Resultant Force of perpendicular lines [tex]\sqrt{10^2 + 15^2}[/tex] [tex]\sqrt{325}[/tex] = 18.02775... Magnitude ??? Direction would possibly be 18 degrees of North or East??? This is where I get stuck....help?? 


#2
Feb2310, 09:30 PM

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P: 3,439

The magnitude is 18.03 N as you have calculated. To find the direction, draw yourself a right triangle with right sides 10 N and 15 N and hypotenuse 18.03 N. Say the 10 N side is due East. Can you figure out how many degrees North of East is the 18.03 N hypotenuse?



#3
Feb2410, 02:41 PM

P: 16

Hypo = 18.03 Adja = 10 Oppo = 15 sinA 15/18.03 = .832 = 56.299 cosA 10/18.03 = .555 = 56.315 tanA 15/10 = 1.5 = 56.31 Correct? 


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