Kinetic friction (fk) is the frictional force that acts on an object when it is already moving, whereas static friction (fs) is the frictional force that prevents an object from moving when a force is applied to it.
The relationship between kinetic friction and static friction is: fk < fs
Kinetic friction is always less than static friction because it takes less force to keep an object moving than to start it moving from rest.
This is because the surfaces in contact have already overcome the initial resistance to motion when the object is moving, making it easier to maintain motion.
Radio waves have a much higher frequency than sound waves.
Sound waves have frequencies in the range of 20 Hz to 20,000 Hz, while radio waves have frequencies in the range of thousands to billions of Hz (kilohertz to gigahertz).
Radio waves are a type of electromagnetic wave, and their frequency is typically measured in kilohertz (kHz), megahertz (MHz), or gigahertz (GHz).
For example, FM radio broadcasts typically use frequencies between 88 MHz and 108 MHz, while AM radio broadcasts use frequencies between 535 kHz and 1605 kHz.
The relationship between current and potential difference (voltage) across a resistor is governed by Ohm's Law, which states that: I = V/R
where I is the current, V is the voltage, and R is the resistance.
This relationship is linear, meaning that if the voltage is reversed (i.e., the connections across the resistor are reversed), the current will also be reversed, but the graph will still be a straight line.
Partial fraction decomposition is a technique used to express a combined fraction (a rational function) as a sum of simpler fractions, called partial fractions.
This is done by breaking down the original fraction into its component parts, each with a simpler denominator.
Epoxy paints are commonly used to coat industrial equipment, including thermal power station components, due to their excellent adhesion, corrosion resistance, and durability.
Epoxy paints form a strong, chemical-resistant film that protects the underlying metal from corrosion and wear.
The removal of the 7th electron from an element of Group VI of the periodic table needs three times more energy than the removal of the 6th electron.
This is because the ionization energy increases as you remove more electrons from an atom, and this is due to the fact that the electrons that are left behind are more strongly attracted to the positive nucleus.
Dry ice is the solid form of carbon dioxide (CO2), and it is an example of a molecular crystal.
In a molecular crystal, the molecules are held together by weak intermolecular forces such as van der Waals forces or hydrogen bonds, rather than by strong chemical bonds.
The Hall voltage (VH) is directly proportional to the magnetic flux density (B) and the current (I) flowing through the conductor, as well as the Hall coefficient (RH) of the material.
The relationship is given by the formula: VH = RH × B × I
