Category: Physics

What is constant acceleration equal to? If the velocity of the particle changes at a constant rate, then this rate is called the constant acceleration. For example, if the velocity of a particle moving in a straight line changes uniformly (at a constant rate of change) from 2 m/s to 5 m/s over one second, […]

Is color blindness a single gene disorder? Colour blindness is a usually a genetic (hereditary) condition (you are born with it). Red/green and blue colour blindness is usually passed down from your parents. The gene which is responsible for the condition is carried on the X chromosome and this is the reason why many more […]

What does it mean when a ship honks 3 times? SHE: Why do they honk three times when they come into port? HE: They are signalling that they are coming home. There’s an old legend of Arturo, a Portuguese fisherman who met a beautiful girl when he came into port. How much does a 100 […]

Why can work output never be more than work input? Because: Some of the work done by the machine is used to overcome the friction created by the use of the machine. Work output can never be greater than work input. Machines allow force to be applied over a greater distance, which means that less […]

What is the formula of potential difference between two points? The potential difference between two points ΔV is often called the voltage and is given by ΔV=VB−VA=ΔPEq Δ V = V B − V A = Δ PE q . The equation for the electric potential due to a point charge is V=kQr V = […]

What is the total energy of the universe? Thus, “the gravitational field has negative energy. In the case of a universe that is approximately uniform in space, one can show that this negative gravitational energy exactly cancels the positive energy represented by the matter. So the total energy of the universe is zero.” Why energy […]

Is blood in your body blue until it touches oxygen? Hemoglobin bound to oxygen absorbs blue-green light, which means that it reflects red-orange light into our eyes, appearing red. That’s why blood turns bright cherry red when oxygen binds to its iron. But this is wrong; human blood is never blue. The bluish color of […]

Can cancer ever be cured? There are no cures for any kinds of cancer, but there are treatments that may cure you. Many people are treated for cancer, live out the rest of their life, and die of other causes. Many others are treated for cancer and still die from it, although treatment may give […]

Which is the smallest galaxy in the world? With no more than 1000 stars apiece, spread out over just a few light-years in space, they’re the most extreme galaxies known today. Dwarf galaxy NGC 5477 is one of many irregular dwarf galaxies. What’s bigger than the multiverse? omniverse What is above an omniverse? One multiverse […]

How do you tell if a compound is a cation or anion? Key Points The electronic configuration of many ions is that of the closest noble gas to them in the periodic table. An anion is an ion that has gained one or more electrons, acquiring a negative charge. A cation is an ion that […]