Two tug boats are towing a large boat, of mass 15 000 kg, in an easterly direction in the channel towards the dock. The first tug boat is pulling with a force of F = 8000N 2 1 at an angle of 28° north of the forward motion and the second tug boat is pulling with a force of F = 8250N at an angle θ south of the forward motion. If there is a resistive force of 4200 N opposing the eastern motion of the large boat, calculate the easterly force acting on the large boat, to the nearest newton.
Question
Two tug boats are towing a large boat, of mass 15 000 kg, in an easterly direction in the channel towards the dock. The first tug boat is pulling with a force of F = 8000N 2 1 at an angle of 28° north of the forward motion and the second tug boat is pulling with a force of F = 8250N at an angle θ south of the forward motion. If there is a resistive force of 4200 N opposing the eastern motion of the large boat, calculate the easterly force acting on the large boat, to the nearest newton.
Solution
Para resolver este problema, debemos descomponer las fuerzas en sus componentes y luego sumar las componentes en la dirección este y norte-sur. Aquí están los pasos detallados:
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Descomposición de las fuerzas:
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La primera fuerza está a un ángulo de 28° al norte del este.
- Componente este de :
- Componente norte de :
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La segunda fuerza está a un ángulo θ al sur del este.
- Componente este de :
- Componente sur de :
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Sumar las componentes en la dirección este:
- La fuerza total en la dirección este es la suma de las componentes este de y , menos la fuerza resistiva.
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Calcular las componentes:
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Sumar las componentes este y restar la fuerza resistiva:
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Determinar el ángulo θ:
- Para que la fuerza en la dirección norte-sur se cancele, las componentes norte y sur deben ser iguales.
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Calcular la componente este de :
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Sumar las componentes este y restar la fuerza resistiva:
Por lo tanto, la fuerza en dirección este que actúa sobre el gran barco es aproximadamente 10214 N.
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