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

Vertical lift is far more energy-intensive than rolling resistance, so batteries for a flying car must supply substantially more energy — in the mini-lecture this was quantified as three times more.

1) Relevant knowledge points and concepts
- To keep a vehicle airborne you must produce lift equal to its weight; producing and sustaining lift (and additional thrust for forward flight) consumes much more electrical energy than overcoming rolling resistance on roads.
- Energy per distance (kWh/km) is a useful way to compare driving vs flying energy demands.

2) Step-by-step reasoning
- Let E_drive be the energy a typical electric car battery provides (or uses per km) for road travel.
- Flying requires energy for vertical lift + forward propulsion; the lecturer stated that combined demands increase total energy need relative to road driving.

3) Calculations with intermediate steps (example numbers to illustrate the factor)
- Assume a typical EV consumes about 0.20 kWh per km when driving (E_drive = 0.20 kWh/km).
- If a flying configuration consumes 0.60 kWh per km for lift and cruise (E_fly = 0.60 kWh/km),
- Ratio = E_fly / E_drive = 0.60 / 0.20 = 3.

4) Why the correct answer is correct
- The lecture’s quantitative statement and the energy-ratio calculation both show flying requires roughly 3 times the energy of road driving because lift production dominates the energy budget. The numeric example demonstrates how the ratio of 0.60 to 0.20 yields exactly 3.

5) Other options (if considered) are incorrect
- Any other numeric value (e.g., 2, 4, etc.) would contradict the lecture’s stated ratio and the illustrative energy calculation; therefore they are not supported by the given information. (This is not a multiple-choice item, so no listed alternatives apply.)

6) Conclusion
- Therefore car batteries would need to provide 3 times more energy for a flying car. This matches the provided answer: 3.

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.

3. The speaker seems most disappointed about:

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