The Monthy Hall problem is a maths problem that is easy to understand but the solution isn’t so intuitive. The problem is as follows: Suppose you’re on a game show, and you’re given the choice of three doors: Behind one door is a car; behind the others, goats. You pick a door. The host, who[…]
Mass is the amount of matter in an object. Its standard unit of measure is in kilograms (kg). Weight is the force experienced by an object due to gravity. In freefall or in zero-gravity, an object that has mass has no weight. An object on the Moon will have the same mass on Earth, although[…]
Adding salt to water raises its boiling point but lowers its melting point. The sodium chloride ions dissociate in the water and form bonds with the water molecules. These bonds are stronger than the bonds between the water molecules themselves, so more energy is required by the water to break free into water vapour. Similarly,[…]
Space is not devoid of gravity. Gravity keeps all the stars orbiting around the center of the galaxy and all the planets in the solar system orbiting around the sun.
Stars appear to twinkle because we view them through our atmosphere. The light rays get refracted by the miles of air in our atmosphere, and random pockets of cold / warm air causes the light rays to shift in random patterns – so the point-like light sources seem to twinkle. Stars (except for the Sun)[…]
Some questions are quite creative. They are original and force you to think. “Four children decided to find out their total mass. As they did not want their friends to know their individuals mass, the children decided to weigh themselves 3 persons at a time. Although the children tried all possible ways of grouping themselves[…]
We often receive mails that say “Please revert soon.”This is inaccurate. You can say: “Please reply soon.” Revert means reversing to a previous state, condition, practice etc. Example for revert: After the discipline master left the class, the girls reverted to their squabbling.
The Leidenfrost effect is a phenomenon in which a liquid, in near contact with a mass significantly hotter than the liquid’s boiling point, produces an insulating vapor layer keeping that liquid from boiling rapidly. This is most commonly seen when cooking; one sprinkles drops of water in a pan to gauge its temperature: if the[…]
“Mrs Heng prepared ice lemonade for her son’s birthday party. She would like the drink to remain chilled with ice for as long as possible. Which type of ice, blocks or crushed, should she use?” The short answer: Ice blocks. They have less surface area in contact area with the drink than crushed ice. So[…]
This is a common spelling mistake that can result in horrendous misunderstandings. Remember: Desert means arid land or to abandon. Dessert is the sweet course at the end of a meal.