Category: Physics

What is Vitruvius theory? According to Vitruvius, architecture is an imitation of nature. As birds and bees built their nests, so humans constructed housing from natural materials, that gave them shelter against the elements. When perfecting this art of building, the Greeks invented the architectural orders: Doric, Ionic and Corinthian. Is Vitruvius theory correct? While […]

Why does the balloon stick to the wall after it is rubbed on the wool sweater? When you rub a balloon against your clothes and it sticks to the wall, you are adding a surplus of electrons (negative charges) to the surface of the balloon. The wall is now more positively charged than the balloon. […]

What is the principle of magnetic particle inspection? The magnetic particle test method of Non-Destructive Examination was developed in the USA, in the 1930s, as a way to check steel components on production lines. The principle of the method is that the specimen is magnetised to produce magnetic lines of force, or flux, in the […]

Why is hydroxide written as OH? It’s written in “reverse order” because hydroxide is a polyatomic ion that still needs balance to be part of a compound. In most cases, when OH bonds to another ion the oxygen is the one that bonds to the other ion. Because of this it’s is written as OH, […]

When two or more systems are in thermal equilibrium with each other they will have the same temperature? In other words, if two objects are in thermal equilibrium, they have the same temperature. If thermometer A is in thermal equilibrium with object B, and B is in thermal equilibrium with C, then A is in […]

What is time period of a simple pendulum? The time period of a simple pendulum: It is defined as the time taken by the pendulum to finish one full oscillation and is denoted by “T”. Length of a simple pendulum: It is defined as the distance between the point of suspension to the centre of […]

Why Nitrogen is not a greenhouse gas? Oxygen and nitrogen are not greenhouse gases, because they are transparent to infrared light. These molecules are invisible because when you stretch one, it doesn’t change the electric field. In general, symmetrical molecules with only two atoms are not greenhouse gases. Why is sulfur dioxide not a greenhouse […]

How are biochemical sedimentary rocks classified? Sedimentary rocks are classified based on how they form and on the size of the sediments, if they are clastic. Clastic sedimentary rocks are formed from rock fragments, or clasts; chemical sedimentary rocks precipitate from fluids; and biochemical sedimentary rocks form as precipitation from living organisms. What is a […]

What is the most densest element? element osmium What is the lightest natural metal? magnesium What are the 3 lightest metals? The first seven metals in the periodic table are lithium, beryllium, sodium, magnesium, aluminium, potassium and calcium, known collectively as the “lightest metals”. What is the lightest thing in the world? Graphene Aerogel What […]

What is the final velocity of the two vehicle mass? A 1500 kg car traveling at 15 m/s to the south collides with a 4500 kg truck that is intially at rest at a spotlight. The car and the truck stick together and move together after the collison. Therefore, the final velocity of the two-vehicle […]