A model of a helicopter rotor has four blades, each of length 3.30 m from the central shaft to the blade tip. the model is rotat
1 answer:
This motion of helicopter rotor blade is an example of circular motion.
We have the angular velocity of rotor blade = 510 rev/min
= (510*2)/60
= 53.41 rad/s
We have the linear velocity of circular motion = radius * angular velocity
So the speed of the blade tip of helicopter = 53.41 * 3.30
= 176.24 m/s
Speed of the blade tip of helicopter = 176.24 m/s
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Answer : The correct option is, (d) 4 times
Solution :
According to the Coulomb's law, the electrostatic force of attraction or repulsion between two charges is directly proportional to the product of the charges and is inversely proportional to the square of the distance between the the charges.
Formula used :
where,
F = electrostatic force of attraction or repulsion
= Coulomb's constant
and
are the charges
r = distance between two charges
First we have to calculate the force exerted between S and q when the distance between the charge is 1 unit and let us assumed that the charge be 'q'
..........(1)
Now we have to calculate the force exerted between S and p when the distance between the charge is 2 unit at the same charge.
...........(2)
Equation equation 1 and 2, we get
Therefore, the force exerted between S and q is 4 times the force exerted between S and p.