How does the magnetic strip on a credit card work? A magnetic strip has three tracks that hold all of the information pertaining to a card by magnetizing tiny iron particles. We have probably all seen a credit card with a magnetic strip and we have all heard that you shouldn’t keep your credit card […]
#1128 How does the magnetic strip on a credit card work? Read More »
What is the difference between volts, amps, ohms, and watts? Volts measure the difference in electrical force between two points. Amps measure the flow of electricity. Ohms measure the resistance of the material. Watts measure electrical power. The volt is named after Alessandro Volta, who built the first electric battery. Volta lived from 1745 to
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How long can a cable car be? The longest cable car in the world is the Norsjö ropeway in Sweden and it is 13.2 km long. This is probably close to the upper limit of how long a cable car cable can be. The 13.2 km part is just one section of the Norsjö ropeway,
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Why are more plane crashes survivable? Because of technology, training, the way the planes are laid out, and the materials the planes are made of. Many people have a fear of flying and a lot of people have an image that flying is very dangerous. This couldn’t be further from the truth. This fear is
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How do planes refuel in the air? Either by using a long hose or a rigid tube to connect the fuel tanker with the plane being refueled. There are two systems of refueling a plane in the air. These are the probe-and-drogue system and the flying boom system. They’ve come a long way from the
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What is the difference between AM and FM radio? The radio waves are moderated differently. AM radio waves are Amplitude Modulated and FM radio waves are Frequency Modulated. First, we need to look at how a radio broadcasts a signal. The radio has three jobs. It has to take the voice or music that is
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Is there a land speed record limit? Because of physics and current technology there is, but no one knows exactly what that limit is. The current land speed record was achieved in 1997 and it is 1,223.657 km/h (760.343 mph). It was broken by a team driving a car called Thrust SuperSonic Car and the
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How is a Formula 1 pit stop so fast? It is a combination of practice, teamwork, and technology. The fastest ever pit stop recorded during a race was 1.8 seconds and it was achieved by the McLaren team during the Qatar race in 2024. What is the purpose of a Formula 1 pit stop? They
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How do vending machines check money? They check notes with cameras or photocells. They check coins with electromagnets and light sensors. They are much more able to spot fake notes and coins than they used to be. Early vending machines didn’t need to read banknotes because nothing that expensive was sold from them. The very
#950 How do vending machines check money? Read More »
What is a rebreather? It is an underwater device that allows divers to reuse the air that they have breathed out, thereby being able to stay underwater much longer. Most people, when at rest, breathe about 12 times a minute and take in about half a liter of air each time. If we are breathing
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