Have you ever been on an airplane and experienced turbulence?
The most famous tunnel is the thirty mile "Chunnel" between England and France. The Chunnel is actually two separate tunnels, connected by cross passages.
When a train enters a tunnel, it compresses the air in front of it like a piston. Air in a tunnel can't be simply pushed aside--the tunnel walls are in the way.
Why do airplanes sometimes leave long white contrails behind?
How do modern-day pilots navigate their way at 35,000 feet?
Skydiving has become an increasingly popular sport, although most of us haven’t yet taken the plunge and only enjoy it from the sidelines. If you’ve seen video of skydivers in action, especially skydiving teams that link up to create formations, you might wonder how they do it. It’s a matter of elementary physics. Learn more on this Moment of Science.
You’d expect a ride this bumpy if you were driving an off-road vehicle over rocky, uneven terrain, but a bump bump BUMP as you glide 30,000 feet above that terrain in a modern jet liner, might surprise you, not to mention scare the bajeebers out of you. After all, you never notice hard lumps and bumps as you breathe air. What makes an airplane go bump? Learn more on this Moment of Science.
Why do ears pop when traveling by plane? Find out on this Moment of Science.
The most famous tunnel is the thirty mile “Chunnel” between England and France. Thirty miles of air is a lot to push around, so engineers have come up with a clever solution. The Chunnel is actually two separate tunnels, connected by cross passages.
Also, earth’s core is a metal sphere 800 miles wide, but just pretend we’ve bored through it. What would be the result? For one thing, you could then travel to the other side of the world in under one hour.