High School

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Three forces of magnitudes 49 N, 29 N, and 62 N are oriented with respect to the x-axis at angles of 45 degrees, 135 degrees, and 225 degrees, respectively. What is their resultant?

Answer :

The magnitude of the resultant force is determined as 31.78 N.

What is the resultant of the forces?

The resultant of the forces is calculated by applying the following formula as follows.

The sum of the x - component of the forces is calculated as;

X = ( F₁ + F₂ + F₃ ) x

X = 49 N x cos (45) + 29 N x cos (135) + 62 N x cos (225)

X = -29.7 N

The sum of the y - component of the forces is calculated as;

Y = ( F₁ + F₂ + F₃ ) y

Y = 49 N x sin (45) + 29 N x sin (135) + 62 N x sin (225)

Y = 11.31 N

The magnitude of the resultant force is calculated as follows;

R = √ ( Y² + X²)

R = √ ( 11.31² + ( -29.7 )² )

R = 31.78 N

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