Listen to this mini-lecture about flying cars, and answer the following questions. Questions 1 and 2. Complete the following sentences with a NUMBER only. Do NOT write words.1. Car batteries would need to provide Answer Question 1[input] times more energy for a flying car.简答题
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Question

Listen to this mini-lecture about flying cars, and answer the following questions. Questions 1 and 2. Complete the following sentences with a NUMBER only. Do NOT write words.1. Car batteries would need to provide Answer Question 1[input] times more energy for a flying car.简答题

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BlackTom AI · Accepted Answer

Generating lift for flight requires substantially more energy than propulsion on the road, and the mini‑lecture gives a specific factor: car batteries must supply 3 times more energy for a flying car.

1) Relevant knowledge points and concepts
- Rolling motion (driving) mainly consumes energy to overcome rolling resistance and aerodynamic drag at moderate speeds.
- Vertical lift (hovering or short takeoff/landing) requires continual work against gravity and inefficiencies in producing lift (rotor/propeller induced losses), so energy per distance or per minute is higher.
- Electric vehicle energy use is typically measured in kilowatt‑hours per kilometer (kWh/km) or power (kW) for hover.

2) Complete reasoning process step by step
- The lecture compares the net energy required to move the same car mass by road versus by air.
- For driving: energy_driving = baseline (E).
- For flying: energy_flying is larger because you must continuously produce lift equal to weight and overcome poorer propulsive efficiency.
- The lecture concluded that energy_flying = 3 × energy_driving.

3) Calculations and intermediate steps (conceptual numeric framing)
- Let E = energy a car battery must provide for a standard trip on the road.
- Flight energy = factor × E.
- According to the mini‑lecture, factor = 3, so flight energy = 3 × E.
- Example framing: if E = 1 unit (kWh per trip), then flight requires 3 units (3 kWh), showing a threefold requirement.

4) Why the correct answer is correct
- The threefold value directly reflects the lecture’s comparison of energy demands: generating lift and compensating for aerodynamic and propulsive inefficiencies raises the energy requirement to approximately three times that of road travel for the same vehicle mass and trip profile.

5) Why other numeric answers would be incorrect
- Any other number (e.g., 2, 4, 5) contradicts the explicit factor given in the mini‑lecture and the provided comparison; the lecture’s quantitative claim is a threefold increase, not a twofold or fivefold one.

6) Conclusion
- The correct numeric answer is 3, matching the lecture’s statement that car batteries would need to provide 3 times more energy for a flying car.

Listen to this mini-lecture about flying cars, and answer the following questions. Questions 1 and 2. Complete the following sentences with a NUMBER only. Do NOT write words.1. Car batteries would need to provide Answer Question 1[input] times more energy for a flying car.简答题

类似问题

Listen to this mini-lecture about flying cars, and answer the following questions. Questions 1 and 2. Complete the following sentences with a NUMBER only. Do NOT write words.1. Car batteries would need to provide Answer Question 1[input] times more energy for a flying car.

Listen to this mini-lecture about flying cars, and answer the following questions. Questions 1 and 2. Complete the following sentences with a NUMBER only. Do NOT write words.1. Car batteries would need to provide Answer Question 1[input] times more energy for a flying car.

Listen to this mini-lecture about flying cars, and answer the following questions. Questions 1 and 2. Complete the following sentences with a NUMBER only. Do NOT write words.1. Car batteries would need to provide Answer Question 1[input] times more energy for a flying car.

Listen to this mini-lecture about flying cars, and answer the following questions. Questions 1 and 2. Complete the following sentences with a NUMBER only. Do NOT write words.1. Car batteries would need to provide Answer Question 1[input] times more energy for a flying car.

Listen to this mini-lecture about flying cars, and answer the following questions. Questions 1 and 2. Complete the following sentences with a NUMBER only. Do NOT write words.1. Car batteries would need to provide Answer Question 1[input] times more energy for a flying car.

3. The speaker seems most disappointed about:

2. A typical flying car costs about Answer Question 2[input] times more than a regular car.

Choose A, B, C or D as the best answer.30. The author’s main argument is that __________.

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