What factors affect air resistance?
The amount of air resistance an object experiences depends on its speed, its cross-sectional area, its shape and the density of the air. Air densities vary with altitude, temperature and humidity.
Which of the following is an effective way to reduce drag force?
Designing a more streamlined shape and reducing the frontal area by rounding the corners and minimizing the height and width are key to minimizing drag force.
Does air resistance depend on mass?
Air resistance, on the other hand, does not depend on mass, only on the density of air, the shape of the object, and the velocity of the object (or the square of the velocity, depending on the size and density– air resistance is messy…).
What is the resistance of air?
Resistivity and conductivity of various materials
| Material | Resistivity, ρ, at 20 °C (Ω·m) | Conductivity, σ, at 20 °C (S/m) |
|---|---|---|
| Air | 109 to 1015 | ~10−15 to 10−9 |
| Wood (oven dry) | 1014 to 1016 | 10−16 to 10−14 |
| Sulfur | 1015 | 10−16 |
| Fused quartz | 7.5×1017 | 1.3×10−18 |
Does air have high or low resistance?
Why the resistance of air is so high? Its resistivity is approximately 2×1016Ω⋅m.
What is electrical resistance of human body?
about 300 Ω
What is the resistance of a vacuum?
The impedance of ‘free space’ (vacuum) is exactly 119.916 9832 (pi) ohms or approximately 377 ohms.
Does vacuum have resistance?
There is no resistivity in the vacuum (resistance would imply dissipation and nothing dissipates in the vacuum). There is only impedance. The impedance gives you the ratio of electric to magnetic field in an electromagnetic wave. A low resistivity indicates a material that readily allows the flow of electric current.
Does a vacuum have infinite resistance?
A true vacuum would have infinite electrical resistance because there is nothing to carry the current.
What is the resistance of free space?
The characteristic impedance of free space is equal to the square root of the ratio of permeability of free space (in henrys per meter) to the permittivity of free space (in farads per meter). It works out to about 377 Ω, and that is the characteristic impedance of the universe.
What is Z naught?
From Wikipedia, the free encyclopedia. The impedance of free space, Z0, is a physical constant relating the magnitudes of the electric and magnetic fields of electromagnetic radiation travelling through free space. That is, Z0 = |E||H|, where |E| is the electric field strength and |H| is the magnetic field strength.
What is SI unit of wave impedance?
In particular, for a plane wave travelling through empty space, the wave impedance is equal to the impedance of free space. The symbol Z is used to represent it and it is expressed in units of ohms. The symbol η (eta) may be used instead of Z for wave impedance to avoid confusion with electrical impedance.
Which components exist in an electromagnetic wave?
8. Which components exist in an electromagnetic wave? Explanation: In an electromagnetic wave, the electric and magnetic components coexist. They propagate perpendicular to each other and to the direction of propagation in space.