Category: Physics

What is meant by water bodies? A body of water or waterbody (often spelled water body) is any significant accumulation of water, generally on a planet’s surface. The term most often refers to oceans, seas, and lakes, but it includes smaller pools of water such as ponds, wetlands, or more rarely, puddles. What is an […]

Who has right of way at sea? A power driven vessel must give way to a sailing vessel unless the sailing vessel is in the process of overtaking it. When two power driven vessels meet head on, each must alter course to starboard (to the right) and pass at a safe distance. How do you […]

When bowfishing do you aim above or below the fish? In bowfishing, you want to hit the fish in its thickest part so the arrow securely anchors. But you can’t aim directly at the fish. Light refraction in the water distorts what you see, meaning the deeper the fish, the lower you must aim. A […]

What causes spectral lines to appear? Spectral lines are produced by transitions of electrons within atoms or ions. As the electrons move closer to or farther from the nucleus of an atom (or of an ion), energy in the form of light (or other radiation) is emitted or absorbed.… Why do elements have unique spectral […]

How do comets die? COMETS vaporize when their orbits take them close to the Sun. Comets do not melt in the strict sense of becoming liquid. After many orbits near the Sun, a comet does eventually “expire.” In some cases, all the volatile ices boil away, leaving a remnant of rock and dust. Sometime the […]

Which animal makes the longest migration? Caribou Which bird flew the longest? bar-tailed godwit Can birds sleep while flying? Due to the lack of studies monitoring the sleep patterns of flying birds, these hypotheses had previously been left unconfirmed. Now, however, according to a new study from the Max Planck Institute for Ornithology, researchers have […]

Why Ptolemy is wrong? Ptolemy’s next error was to neglect the non-uniform rotation of the superior planets on their epicycles. This is equivalent to neglecting the orbital eccentricity of the earth (recall that the epicycles of the superior planets actually represent the earth’s orbit) compared to those of the superior planets. Why the geocentric model […]

What is the gravitational potential energy of a 3 kg ball that is 1 meter above the floor? In this example, a 3 kilogram mass, at a height of 5 meters, while acted on by Earth’s gravity would have 147.15 Joules of potential energy, PE = 3kg * 9.81 m/s2 * 5m = 147.15 J. […]

How much energy does an active individual need per day? The United States government states that the average man needs 2,700 kcal per day and the average woman needs 2,200 kcal per day. Not everybody needs the same number of calories each day. People have different metabolisms that burn energy at different rates, and some […]

How will the pressure change if area of contact is doubled? Answer. When the surface area is doubled, keeping the force constant, the pressure will decrease. Why does water pressure increase with depth? Pressure increases as the depth increases. The pressure in a liquid is due to the weight of the column of water above. […]