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What are two forces that resist the forward motion of a bus?
two forces that can stop the forward motion are, air resistance and friction.
What is the difference between impedance and resistance?
Resistance is a concept used for DC (direct currents) whereas impedance is the AC (alternating current) equivalent. Resistance and impedance have different fundamental origins even though the calculation for their value is the same: R=V/I
Can air resistance be felt on the ground?
Of course. Next time you're riding in a car, stick your hand out of the window, with your palm facing forward. Can you feel the force ? That's air resistance.
At 110v what body resistance would allow the lethal level of shock current to flow?
well, it depends on the individual. IIRC, 240volt Residual Current Device (AKA ELCB) designed to protect life operate at 60mA which requires a 'simple' body resistance of 4000 ohms. However, this doesn't take account of AC resistance (includes capacitive and reactive impedance) which is dependant on frequency! So, at 110v DC (you don't mention AC or DC voltage) a body resistance of below 2000 would result in a potentially lethal current ... I wouldn't want to test it however - I've had two 240v AC shocks and, to be honest, that's enough. I've 'felt' 110v AC 60Hz and also 110v AC 400Hz - the 400Hz definatly cought my attention .....
What is air resestance?
When you run forward fast tou will feel the air rushing past you. The faster you go the more you will feel the air. This is because to move forward you have to push the air ahead of you out of the way, the energy required to do this is called air resistance or drag. Simply put, a doubling of the speed of something moving though the air, quadruples the air resistance (the drag force) acting against its forward motion.
What is the behavior of a forward and reverse biased diode?
Forward Resistance:def: It is resistance offered by diode to the forward bias is known as forward resistance.This resistance is not the same for the flow of DC as for the changing current. Accordingly this resistance is of two types :1. DC FORWARD RESISTANCE.2. AC FORWARD RESISTANCE.1. DC forward resistance: It is the opposition by diode to the DC. It is measured by the ratio of DC voltages across the diode to the resulting DC current through it.2. AC forward resistance: It is the opposition offered by the diode to the changing current. It is measured by the ratio of change in voltage across diodes to the resulting change in current through diode. The AC forward resistance is more significant as the diodes are generally used with alternating voltage.Reverse Resistance:def: The resistance offered by the diode to the reverse bias is known as Reverse Resistance. It can be DC reverse resistance or AC reverse resistance depending upon whether the reverse bias is direct or changing voltage. Idealy the reverse resistance of a diode is infinte however in practice the reverse resistance is not infinite because for any value of reverse bias, there does exist a small leakage current. It may be emphasized their that reverse resistance is very large compared to the forward resistance.These Definitions are from PRINCIPLES OF ELECTRONICS by V.K MEHTA and ROHIT MEHTA
How do you find the ac resistance of a diode?
The ac resistance of a diode is found using the equation: (The change in Vd)/(The change in Id) An easier was is to use the Equation: 26mV / Id. This is a general form as the ac resistance of a diode change as the temperature changes.
What is the importance of the reverse-to-forward resistance ratio of a diode?
to determine the comparison of resistance value of both forward and reverse diode . The more the resistance the lower the current , the lower the resistance the higher the current . When reverse bias , the resistance is high and it acts in open circuit and the reverse current is very small that can be neglected . When forward bias , the resistance is low and it acts as short circuit and the forward current is increasing as the voltage supply is higher .
Why resistance doesnot depend on frequency of ac?
Because Resistance is material property...
Do swim costumes reduce resistance and drag in the water?
resistance created by a fluid to forward motion. The resistance met by a swimmer in their forward progress caused by the water is passive drag;
What is the opposition to the current flow?
resistance is the opposition to the flow of electric charge
What is ac resistance of a diode?
ratio of ac voltage applied across the diode to the ac current flowing through it
What is the total opposition to a current flow in an AC circuit with both resistance and reactance?
Resistance
What is a difference between DC and ac resistance and expline DC resistasce?
DC is just direct current into a resistance it is a linear function. AC if the resistance is non reactive it would be the same linear function.
Compare the sizes of forward force and air resistance while a car is moving at 30mph?
when a car is speeding up how does the forward force and air resistance compare
The bluk resistance of a diode depends on?
Bulk resistance of diode depends on how it is biased. The bulk resistance of a diode is the approximate resistance of the diode when it is forward biased.
How physics affects flying?
gravity holds you down wings + forward motion = lift thrust = forward motion air resistance = resistance to forward motion thin air at altitude is easier and cheaper to get through
