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To solve this problem we will start from the given concept in which the number of turns is equivalent to the length of the thread per circumference of spool. That is:
Where,
l = length of the thread
= circumference of spool
For \phi we have that,
For l we have that
l = 62.8m
Finally the number of Turns would be,
Therefore the number of turns of thread on the spool are 1000turns.
Answer:
Explanation:
mass of each ball, m = 1 kg
Let the charge on each ball is q.
If the balls remains fix then the gravitational force is balanced by the electrostatic force between them and as the gravitational force is attractive in nature then the electrostatic force should be repulsive in nature.
The charges should be of same sign to get the electrostatic force is repulsive in nature.
Let the distance between the two balls is d.
The electrostatic force between them is given by
... (1)
The gravitational force between the two balls is given by
... (2)
according to the question, gravitational force is equal to the electrostatic force, so by equation (1) and (2) ,we get
Thus, the charge on each ball is
Answer:Because of their strong winds, jet streams play an important role in the economy of the aviation industry. When an airplane flies into a jet stream for any period of time, extra fuel must be used. Not only is the fuel expensive, but it takes up room where either passengers or cargo could be. Just the opposite occurs when an airplane flies with a jet stream at its back. Fuel and money are saved because the wind pushes the plane along.
Explanation: