Category: Physics

Are sextants still used? Newer technologies have all but replaced the humble sextant. During World War II, the U.S. began using land-based radio beacons known as the LORAN system to help guide ships. Who invented sextants? John Campbell What did they use before the sextant? The cross-staff was an ancient precursor to the modern marine […]

Why is penicillin called the Queen of drugs? Penicillin was hailed as a “miracle drug” that could save lives and effectively treat a variety of infectious diseases. Today, there are many natural and synthetic types of penicillin, which are used to treat a wide range of ailments. What is a natural penicillin? Natural Penicillins were […]

What type of plane hit the Empire State Building? A U.S. Army Air Force B-25 bomber, attempting to maneuver over New York City in a heavy fog, flew into the side of the Empire State Building on this date 75 years ago. All three aboard the plane and 11 in the building itself were killed. […]

What are 5 sewing safety rules? Safety Around the Sewing Machine 1) Choose a safe setup. 2) Eyes on the needle! 3) Unplug when changing the feet (and you are done sewing) 4) Unplug the machine when you clean it. 5) Always use the correct needle. 6) Don’t go (too) fast. 7) Turn off the […]

Is walking in space tiring? Of course, there are a few challenges involved in performing a spacewalk. Since the space suit is pressurized, it requires some effort to move the fingers of the glove. It’s not difficult at first, but after several hours, an astronaut’s hands can get tired and sore. Can you walk in […]

Why can Hippos run so fast? To defend themselves they have the ability to charge or otherwise very powerfully attack possible threats. The viciousness of the attack is due in part to how much energy is needed for such a large animal to move so quickly. Physics is just against them being able to do […]

What type of materials do engineers use to increase the mechanical advantage of a machine? Because friction is always present. What type of materials do engineers use to increase the mechanical advantage of a machine? They use low-friction materials and lubricants often. Why is the actual mechanical advantage of a machine always less than its […]

Do portable air conditioners need to be drained? In most cases, your portable air conditioner will not need to be drained. Edgestar, Avallon and Koldfront portable air conditioners use a condensation exhaust system to expel water vapor collected during the dehumidifying/cooling process. When this situation does occur you will need to drain the internal water […]

When you cut your speed in half you cut your kinetic energy by? When you cut your speed in half, you can cut your kinetic energy by. When you cut your speed in half, you cut your kinetic energy by four times. This answer has been confirmed as correct and helpful. What happens if you […]

How sedimentary rock is formed? Clastic sedimentary rocks are made up of pieces (clasts) of pre-existing rocks. Pieces of rock are loosened by weathering, then transported to some basin or depression where sediment is trapped. If the sediment is buried deeply, it becomes compacted and cemented, forming sedimentary rock. What is the cycle of a […]