Question

1. A helicopter rises vertically at a constant speed. A helicopter blade What is the trajectory of the point on the tip in the ground reference frame? A) Point B) Spiral upwards C) Circle D) Straight line up 1. A helicopter rises vertically at a constant speed . A helicopter blade What is the trajectory of the point on the tip in the ground reference frame ? A ) Point B ) Spiral upwards C ) Circle D ) Straight line up​

Answer 1

Ответ:  B ) Спираль вверх

Объяснение:

При подъеме вертолета его лопасть вращается, а вертолет поднимается  вверх. В результате точка на лопасти совершает вращательно-поcтупательные движения вверх.  В результате получается спираль.

Answer 2

When a helicopter rises vertically at a constant speed, the trajectory of the point on the tip of the helicopter blade, in the ground reference frame, is a straight line up. The correct answer is D) Straight line up.

Here's a brief explanation:

1. Point A: - A straight line represents a constant distance in one direction. In this case, as the helicopter is rising vertically at a constant speed, the point on the tip of the blade will move straight up, creating a linear trajectory.

2. Point B (Spiral upwards): - A spiral would imply a changing radius or distance from a central point. However, in this scenario, the helicopter is rising vertically, maintaining a constant distance from the ground.

3. Point C (Circle): - A circular trajectory would suggest a continuous motion around a fixed center. In the case of a helicopter rising vertically, the trajectory is linear, not circular.

4. Point D (Straight line up): - This is the correct choice. As the helicopter ascends vertically, the trajectory of the point on the blade's tip, in the ground reference frame, is a straight line upward.

Therefore, the correct answer is D) Straight line up.