Why are fuel cells so useful in spacecraft?
Asked in Fuel Cells
What a fuel cell is why is it useful in spacecraft?
Asked in Space Travel and Exploration, Robotics
Why are space rovers so small?
Asked in Fuel Cells
What is a fuel cell and why is it so useful in spacecraft?
Asked in Noble Gases
Why do modern spacecraft use helium instead of hydrogen?
What is the difference between an airplane and a spacecraft?
The simple answer is that an airplane and a jet use the air around us for lift. Spacecraft are designed to fly outside of our atmosphere so there is no air. They use powerful rocket engines to lift themselves into space. A spacecraft must be sealed for anyone to live in it. It must carry anything but fuel only its fuel but the oxygen to burn the rocket engines. An airplane can bring in air from the outside for people to breath and to burn the fuel it carries.
Asked in Space Travel and Exploration, Gravity
Is gravity used in space travel?
If you mean do any manned spacecraft use artificial gravity, the answer is, not so far. But, in the future, large spacecraft may create artificial gravity by rotating them. To conserve fuel, the gravity of the moon/planets is used to pull spacecraft toward them. And of course the gravity of earth is used to hold/pull on spacecraft so they orbit (circle) around it instead of flying off into space.
Asked in Chemistry
Why is fractional distillation so useful in the oil?
Asked in Chloroplasts
Why are there several chloroplast in the plant cells?
Why fuel efficiency is important?
Fuel efficiency determines how much useful energy you get out of each unit of fuel. If fuel efficiency drops you have to use more fuel to get the same job done. And fuel cost money, so you'll also have to pay more to get the same job done. And burning fossil fuels contributes to pollution, so with poorer fuel efficiency you have to put up with more pollution being released for thesame amount of useful work being done.