Danh ngôn của Henry Spencer
Sometimes people wonder why aeroplanes are so cheap and rockets are so expensive. Even the most superficial comparison shows one obvious difference: aeroplane engines use outside air to burn their fuel, while rockets have to carry their own oxidisers along.
Sometimes people wonder why aeroplanes are so cheap and rockets are so expensive. Even the most superficial comparison shows one obvious difference: aeroplane engines use outside air to burn their fuel, while rockets have to carry their own oxidisers along.
Đôi khi người ta thắc mắc tại sao máy bay lại rẻ và tên lửa lại đắt đến vậy. Ngay cả sự so sánh hời hợt nhất cũng cho thấy một sự khác biệt rõ ràng: động cơ máy bay sử dụng không khí bên ngoài để đốt cháy nhiên liệu, trong khi tên lửa phải mang theo chất oxy hóa riêng.
Tác giả: Henry Spencer | Chuyên mục: Space | Sứ mệnh: [6]
Tìm kiếm kiến thức và thông tin về Henry Spencer từ chuyên trang Kabala Tra Cứu. Nếu bạn không tìm được thông tin phù hợp, hãy liên hệ: [email protected]
Các câu danh ngôn khác của cùng tác giả: Henry Spencer
- Supplying fuel for a Mars expedition from the lunar surface is often suggested, but it's hard to make it pay off - Moon bases are expensive, and just buying more rockets to launch fuel from Earth is relatively cheap.
- In 1960-61, a small group of female pilots went through many of the same medical tests as the Mercury astronauts and scored very well on them - in fact, better than some of the astronauts did.
- The Orion capsule uses an escape system quite like that of the Apollo spacecraft in the 1960s and 70s: an 'escape tower' containing a solid-fuel rocket that will pull it up and away from Ares I in a pinch.
- Whether solid rockets are more or less likely to fail than liquid-fuel rockets is debatable. More serious, though, is that when they do fail, it's usually violent and spectacular.
- Reusable rockets promise much easier testing because you should usually get them back, and you can debug as you go rather than having to get everything perfect the first time.
Các câu danh ngôn khác của cùng chuyên mục: Space
- Your belief system saturates the space around you.
- I actually don't invest in anything that is social, mobile, deals or ad networks simply because those are areas where there are so many players and so many other smart people in the space, I feel like I don't have a competitive advantage. So I tend to go after things that are e-commerce, like healthcare.
- I didn't go to school for illustration. I did larger pieces, mostly drawings and paintings, and minored in video, but when I moved to N.Y.C., I didn't have a studio space anymore and downsized to my desk and started illustrating. I started a greeting card company and sold cards all over the city.
- When time and space and change converge, we find place. We arrive in Place when we resolve things. Place is peace of mind and understanding. Place is knowledge of self. Place is resolution.
- Maybe I didn't take the advantage and become a star and get all the brands so that I could solidify my space in the world.