Category: Physics

What is the main magnetic field in MRI? The earth’s magnetic field is about 0.5 gauss. The strength of electromagnets used to pick up cars in junk yards is about the field strength of MRI machines (1.5 to 2.0T). The B o in MRI refers to the main magnetic field and is measured in Tesla […]

Did doctors ever endorse cigarettes? During the 1920s, Lucky Strike was the dominant cigarette brand. This brand, made by American Tobacco Company, was the first to use the image of a physician in its advertisements. “20,679 physicians say ‘Luckies are less irritating,” its advertisements proclaimed. Did the CDC ever say smoking was safe? This unit—later […]

What two forces affect a spacecraft in space? Only Two Forces Affect a Spacecraft in Space But lift and drag—both created by movement through air—are absent in the near vacuum of space. What forces act on a balloon rocket? There are two main forces acting on the balloon rocket car: Friction and Air resistance. The […]

How do you say someone is super fast? Some common synonyms of speedy are expeditious, fast, fleet, hasty, quick, rapid, and swift. What is very quickly? adverb. with speed; rapidly; very soon. Is it correct to say very fast? Fast is both an adjective and an adverb. Quick is an adjective and the adverb form […]

How fast is the bottom of the ladder sliding away from the wall? A 10-ft ladder is leaning against a house on flat ground. The house is to the left of the ladder. The base of the ladder starts to slide away from the house. When the base has slid to 8 ft from the […]

How can you drop an egg without breaking it riddle? A magician is standing on a concrete floor holding a raw egg with his hand outstretched. Without the aid of any objects, he is able to drop the egg two feet without breaking it’s shell. How does egg drop work? The egg gains potential energy […]

Who must pay Hawaii state income tax? Do I Need to File a Hawaii State Tax Return? Resident: If you lived in Hawaii for at least 200 days, you are considered a resident unless you were there for educational or work purposes (military) alone. As a resident, you must file a Hawaii state tax return […]

How do Machine help us? When a force is applied over a distance, it produces work. It also takes twice as much work to lift the same object twice as far. As indicated by the math, the main benefit of machines is that they allow us to do the same amount of work by applying […]

What is the recommended spark plug gap? The gap setting is different for each vehicle but most are somewhere between 0.028″ and . 060″. Consult the owner’s manual or Champion ® catalog to find the recommended setting for the vehicle you’re working on. Should you lubricate spark plug threads? NGK does not recommend the application […]

Do waves change direction as they approach shore because they begin to drag? As a wave approaches land it usually changes direction due to the way the wave drags on the bottom. When these waves change direction they can create a headland. A headland is a part of the shore that sticks out into the […]