How much energy is in a firework? While most real firecrackers are limited by law to 50 milligrams (mg) of gunpowder, the party poppers that are sold in stores are capped out at 16 mg of gunpowder each. Given that gunpowder has a specific energy of 3.0 Megajoules per kilogram, we can calculate that each […]
Is gold a ferromagnetic metal?
Is gold a ferromagnetic metal? Gold (Au) in its bulk form, like the metal in a wedding ring, is not considered a magnetic material. Technically, it is classified as “diamagnetic”, meaning that it can be repelled by a magnetic field, but cannot form a permanent magnet. Why Fe is ferromagnetic? The popular understanding of a […]
How can you classify map projections in terms of their distortion characteristics?
How can you classify map projections in terms of their distortion characteristics? A common method of classification of map projections is according to distortion characteristics – identifying properties that are preserved or distorted by a projection. The distortion pattern of a projection can be visualized by distortion ellipses, which are known as Tissot’s indicatrices. What […]
How do metal leaf Electroscopes work?
How do metal leaf Electroscopes work? An electroscope is a device that detects static electricity by using thin metal or plastic leaves, which separate when charged. Electrical charges move to the metal and down to the foil leaves, which then repel each other. Since each leaf has the same charge (positive or negative), they repel […]
Does Bubble Wrap actually work?
Does Bubble Wrap actually work? Ms Edwards said the bubble wrap should also cover the metal window frames, which are “really conductive”. She said many houses in the ACT were poorly insulated. Bubble wrap works by increasing the isolative value of the window, making it effective in keeping the heat out in summer and preventing […]
Which of the following will not affect the rate of evaporation?
Which of the following will not affect the rate of evaporation? Explanation: The rate of evaporation is depends on some factors like temperature, wind speed, surface area etc. But not on the mixed absolute heavy impurities. At what temperature does water start evaporating? 212° F How do you calculate the evaporation rate of water? I […]
What is the slowest spreading ocean?
What is the slowest spreading ocean? The Gakkel Mid-Ocean Ridge (MOR) is the slowest spreading center on the planet with full-spreading rates between 1.33 cm/yr along the Greenland end to 0.63 cm/yr along the Siberian end. What is the difference between a fast spread and a slow spread? Steep steps in the seafloor that can […]
What can charge an insulator?
What can charge an insulator? A conductor is a substance that allows charge to flow freely through its atomic structure. An insulator holds charge within its atomic structure. Objects with like charges repel each other, while those with unlike charges attract each other. What is difference between conduction and induction? In conduction, the neutral body […]
What is the fastest accelerating plane?
What is the fastest accelerating plane? Lockheed SR-71 Blackbird What is the highest Mach speed ever recorded? It’s Official. Guinness World Records recognized NASA’s X-43A scramjet with a new world speed record for a jet-powered aircraft – Mach 9.6, or nearly 7,000 mph. The X-43A set the new mark and broke its own world record […]
What is difference between RF and IF?
What is difference between RF and IF? RF to IF conversion is achieved using a RF device called Down-converter. Heterodyne and homodyne receiver architectures are used to convert modulated RF signal to IF signal. Superheterodyne uses 10.7MHz as first IF and 470KHz as second IF….RF vs IF. Type of application Intermediate Frequency value Radar 30MHz […]