Question

The rotor of a ship rotates in clockwise direction when viewed from stern and the ship takes a left turn. The effect of gyroscopic couple acting on it will be

• A. to raise the bow and lower the stern
• B. to raise the bow and stern
• C. to raise the stern and lower the bow
• D. to lower the bow and stern

Answer 1

The correct option is A to raise the bow and lower the stern


${\text{Let the ship is moving along positive}}^{\prime }{x}^{\prime }\text{direction}$

$\text{Direction of}\omega \text{(angular of velocity of spinning) is towards right (along x-axis).}$

$\text{Direction of}{\omega }_p\text{(angular of velocity of procession) is upwards (along y-axis).}$

$\text{So,}\overrightarrow{\omega }\times {\overrightarrow{\omega }}_p\text{is anticlockwise in vertical plane (i.e., XY plane)}$

$\text{so it will raise the bow and lower the stern}$