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Question 1.Find the magnitude and direction of the resultant vector obtained by addinga. displacements of 30 m E and 20 m N;b. velocities of 16 m s–1 W and 30 m s–1 S;c. forces of 20 N NW and 10 N N

Question

Question 1.Find the magnitude and direction of the resultant vector obtained by addinga. displacements of 30 m E and 20 m N;b. velocities of 16 m s–1 W and 30 m s–1 S;c. forces of 20 N NW and 10 N N

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Solution

Claro, vamos a resolver cada parte del problema paso a paso.

Parte a: Desplazamientos de 30 m E y 20 m N

  1. Representamos los desplazamientos en un sistema de coordenadas:

    • 30 m hacia el Este (E) se representa como A=30mi^ \vec{A} = 30 \, \text{m} \, \hat{i}
    • 20 m hacia el Norte (N) se representa como B=20mj^ \vec{B} = 20 \, \text{m} \, \hat{j}
  2. Sumamos los vectores: R=A+B=30mi^+20mj^ \vec{R} = \vec{A} + \vec{B} = 30 \, \text{m} \, \hat{i} + 20 \, \text{m} \, \hat{j}

  3. Calculamos la magnitud del vector resultante: R=(30m)2+(20m)2=900+400=130036.06m |\vec{R}| = \sqrt{(30 \, \text{m})^2 + (20 \, \text{m})^2} = \sqrt{900 + 400} = \sqrt{1300} \approx 36.06 \, \text{m}

  4. Determinamos la dirección del vector resultante usando la tangente del ángulo: θ=tan1(20m30m)=tan1(23)33.69N de E \theta = \tan^{-1} \left( \frac{20 \, \text{m}}{30 \, \text{m}} \right) = \tan^{-1} \left( \frac{2}{3} \right) \approx 33.69^\circ \, \text{N de E}

Parte b: Velocidades de 16 m s–1 O y 30 m s–1 S

  1. Representamos las velocidades en un sistema de coordenadas:

    • 16 m/s hacia el Oeste (W) se representa como A=16m/si^ \vec{A} = -16 \, \text{m/s} \, \hat{i}
    • 30 m/s hacia el Sur (S) se representa como B=30m/sj^ \vec{B} = -30 \, \text{m/s} \, \hat{j}
  2. Sumamos los vectores: R=A+B=16m/si^+(30m/sj^)=16m/si^30m/sj^ \vec{R} = \vec{A} + \vec{B} = -16 \, \text{m/s} \, \hat{i} + (-30 \, \text{m/s} \, \hat{j}) = -16 \, \text{m/s} \, \hat{i} - 30 \, \text{m/s} \, \hat{j}

  3. Calculamos la magnitud del vector resultante: R=(16m/s)2+(30m/s)2=256+900=1156=34m/s |\vec{R}| = \sqrt{(-16 \, \text{m/s})^2 + (-30 \, \text{m/s})^2} = \sqrt{256 + 900} = \sqrt{1156} = 34 \, \text{m/s}

  4. Determinamos la dirección del vector resultante usando la tangente del ángulo: θ=tan1(30m/s16m/s)=tan1(3016)61.93S de O \theta = \tan^{-1} \left( \frac{30 \, \text{m/s}}{16 \, \text{m/s}} \right) = \tan^{-1} \left( \frac{30}{16} \right) \approx 61.93^\circ \, \text{S de O}

Parte c: Fuerzas de 20 N NO y 10 N N

  1. Descomponemos las fuerzas en sus componentes:

    • 20 N hacia el Noroeste (NW) tiene componentes A=20cos(45)i^+20sin(45)j^=14.14Ni^+14.14Nj^ \vec{A} = 20 \cos(45^\circ) \, \hat{i} + 20 \sin(45^\circ) \, \hat{j} = -14.14 \, \text{N} \, \hat{i} + 14.14 \, \text{N} \, \hat{j}
    • 10 N hacia el Norte (N) se representa como B=10Nj^ \vec{B} = 10 \, \text{N} \, \hat{j}
  2. Sumamos los vectores: R=A+B=14.14Ni^+(14.14N+10N)j^=14.14Ni^+24.14Nj^ \vec{R} = \vec{A} + \vec{B} = -14.14 \, \text{N} \, \hat{i} + (14.14 \, \text{N} + 10 \, \text{N}) \, \hat{j} = -14.14 \, \text{N} \, \hat{i} + 24.14 \, \text{N} \, \hat{j}

  3. Calculamos la magnitud del vector resultante: R=(14.14N)2+(24.14N)2=200+582.72=782.7227.98N |\vec{R}| = \sqrt{(-14.14 \, \text{N})^2 + (24.14 \, \text{N})^2} = \sqrt{200 + 582.72} = \sqrt{782.72} \approx 27.98 \, \text{N}

  4. Determinamos la dirección del vector resultante usando la tangente del ángulo: θ=tan1(24.14N14.14N)=tan1(24.1414.14)59.04N de O \theta = \tan^{-1} \left( \frac{24.14 \, \text{N}}{14.14 \, \text{N}} \right) = \tan^{-1} \left( \frac{24.14}{14.14} \right) \approx 59.04^\circ \, \text{N de O}

Así, hemos encontrado la magnitud y dirección de los vectores resultantes para cada caso.

This problem has been solved

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