Today, the weight of a space shuttle at launch is approximately 95 percent fuel. What could we accomplish if we could reduce our need for so much fuel and the tanks that hold it? International space agencies and
Why is Mars the way it is, even though it's the same age as the Earth, and not too much different in size than the Earth, why has Mars had such a different past in the Earth? And what does that mean for us in the long term health and life of our own planet? We learn ...
How much water does a steam engine use? How much torque does a steam engine have? How much does a steam engine weigh? How many rocket engines were on the Apollo 11? How many reactors did Chernobyl have? How much does the Big Boy steam engine weigh? How many boats in a flotilla?
How much did the Wright brothers' plane weigh? How many voyages did Sir Francis Drake go on? How many siblings did Shirley Chisholm have? How many planes were destroyed in the Battle of Britain? How many Anzacs died at Gallipoli Landing? How many children did Elizabeth of York have? How...
Because much of New Orleans lies below sea level, the city is at risk from flooding. Emergency management officials must begin evacuations (疏散) well before a storm strikes. But evacuation costs money: Businesses close, tourists leave, and citizens take precautionary measures. The mayor of New...
The turbines used in a hydroelectric plant look completely different from a steam turbine because water is so much denser (and slower moving) than steam, but it is the same principle. Wind turbines, also known as wind mills, use the wind as their motive force. A wind turbine looks nothing...
Will be much more fun The second time o’takin’. — (c) Matt Begeman Along cam Sir Isaac Newton Doin’ mathematical computin’. One day he contrived To anti-derive When findin’ signed areas is suitin’. There once was a user named Fred, ...
The Sherman compared well to the other tanks in its weight class. It even fared well against vehicles much larger when you take in the whole picture. The US spent a lot of money lavishly equipping these tanks, even the lend-lease tanks shipped with...
The smaller it is, the sooner we go back, and adding an additional pair of solid rocket boosters not only will not increase the payload enough, but require much more extensive development and reduce reliability. It would also greatly increase the difficulty of man-rating the thing. The benne...
they do have certain drawbacks as well. The main disadvantage is a lack of control over operations, storage, and delivery. When you outsource to a fulfillment center, you no longer control how much stock to store, how to manage the operations team, or even monitor how your orders are packa...