A jet with a mass of 75 tonne if flying to the left. It is travelling at the constant speed of 600 km/h in level flight.
Calculate the net force acting on the jet when it is travelling at a speed of 600 km/h. Take g as 10m/s-2.

To calculate the net force acting on the jet when it is traveling at a speed of 600 km/h in level flight, we can consider the following information:

### Key Information:
- **Mass of the jet (\(m\))**: 75 tonnes \(= 75,000 \, \text{kg}\)
- **Speed of the jet (\(v\))**: 600 km/h
- **Acceleration due to gravity (\(g\))**: \(10 \, \text{m/s}^2\)
- **Flight Condition**: Constant speed, level flight

### Conceptual Analysis:
Since the jet is flying at a constant speed in level flight, the net force acting on it is zero. However, you have provided the acceleration due to gravity \(g\), so let's analyze the forces in more detail.

### Forces Acting on the Jet:
1. **Weight (\(W\))**: The weight of the jet is the force due to gravity and is given by:
   \[
   W = m \times g
   \]
   Substituting the given values:
   \[
   W = 75,000 \, \text{kg} \times 10 \, \text{m/s}^2 = 750,000 \, \text{N}
   \]

2. **Lift**: In level flight, the lift generated by the wings must exactly balance the weight of the jet. Therefore, the lift force is also \(750,000 \, \text{N}\) but acting upwards.

3. **Thrust and Drag**: For the jet to maintain a constant speed of 600 km/h, the thrust produced by the engines must exactly balance the drag force. Thus, the net horizontal force is zero.

### Conclusion:
- **Vertical Forces**: Lift balances weight, so the net vertical force is zero.
- **Horizontal Forces**: Thrust balances drag, so the net horizontal force is zero.

Since the jet is in equilibrium (constant speed, level flight), the **net force** acting on the jet is:

\[
\text{Net Force} = 0 \, \text{N}
\]

The inclusion of gravity in the problem simply confirms that the lift and weight are balanced, further reinforcing that the net force remains zero.

Would you like to explore this further?

Here are five related questions you might consider:
1. How would the net force change if the jet were accelerating?
2. What is the relationship between thrust and drag during level flight?
3. How does the weight of the jet impact fuel consumption?
4. How is lift generated by the wings of an aircraft?
5. What factors influence the drag experienced by a jet?

**Tip:** When analyzing forces on an object in equilibrium (constant velocity), always consider the balance of forces in both the horizontal and vertical directions.

Learn how to calculate the net force acting on a jet flying at a constant speed of 600 km/h. Understand the forces involved, including weight, lift, thrust, and drag, in level flight. Suitable for high school students studying Newtonian mechanics and forces in motion.

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