Science & Mathematics Questions & Answers

The distance between planets was calculated by Copernicus using Kepler’s Third Law of Planetary Motion. According to Kepler’s Law of Motion, the square of the time period of the revolution of a planet around the sun is directly proportional to the cube of the semi-major axis of its orbit. Using this law, the distance between planets can be calculated.

Salt is a mineral that can be found in both liquid and solid form. It can be found in oceans, lakes, or rock-beds buried deep in the earth. Where the salt comes from is the key to how it is made. Salt from oceans and lakes can be produced by letting shallow holes of water dry up in the sun. …

Fruity, musk, floral, woodsy… believe it or not, the human nose can detect the difference between nearly 1,000 different odours. Our nose is very sensitive to delicate variations in smell. To cater to the need ‘to smell good’, perfume manufacturers churn out innovative new fragrances all the time. Perfume manufacturers spend a lot of money on making a perfume, research, …

Paper is made from wood, and many of the world’s paper mills are found in those countries which have great forests – Canada, Sweden and Finland. The newly cut trees are usually stripped of their bark, branches and foliage where they have fallen, so that by the time they arrive at the paper mill they are ready for processing. The …

How is inflation calculated? — Each country has its own method to calculate inflation. However, it reflects how the market prices affect a person’s purchasing capacity. In India, it is based on Wholesale Price Index (WPI) where the price level of the data of 435 commodities is tracked through WPI.

The equatorial area is a region of high temperature. Due to intense heating, the atmosphere heats up, expands and becomes lighter. Hence, the air starts rising vertically, causing low pressure on the ground. The horizontal movement of wind in this belt is very feeble. It is, therefore, a calm belt, also known as doldrums.

First of all, raw buffalo milk stored in big steel containers is given thermic treatment and then it is poured into a cream separator where curdling is done by induction of natural whey. The curd is stored in tubs to reduce acidification processes till it reaches a pH value of nearly 4.95. Then, hot water is poured on it in …

The atomic mass of a specific atom or molecule is determined by using an experimental technique called mass spectrometry. This technique separates different isotopes of atoms to allow determination of the percent abundance or isotopic composition of the element in the given sample. Each isotope of the element appears as a peak in the mass spectrum. The intensity (height) of …

Satellite and cellular phones are wireless devices. They almost look alike but the way they work is totally different. A cellular phone functions on the basis of cells, and hence are called cell phones. The whole network area is divided into small areas and an antenna is installed in each area. These are also called towers. When a cellular phone …

Stars vary in temperature greatly. The hottest stars have surface temperatures of as much as 35,000 (C or more and shine a brilliant blue-white. The less hot stars are, the redder they appear to be. Stars are classed into various groups according to their surface temperature.