Question

The wind is blowing southward at 75.0km/hour . In what frame of reference is this speed measured?

a. The speed is measured relative to the plane.
b. The speed is measured relative to the air.
c. The speed is measured relative to the ground.

Answer 1

The speed of the wind blowing southward at 75.0km/hour is measured relative to the ground. It indicates the wind's movement in comparison to a fixed point on the Earth's surface.

Step-by-step explanation:

The speed of the wind is typically measured in reference to the ground. This means that when we say the wind is blowing southward at 75.0 km/hour, we are saying it's moving at this speed compared to a stationary point on the Earth's surface.

The wind's speed relative to other moving objects, such as an airplane or the air mass itself, would involve different frames of reference and might be different due to the relative motion between the moving objects and the air mass.