Rubbing a balloon on hair is an example of static charging by....
2 answers:
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The resistance of a given conductor depends on its electrical resistivity (), its length(L) and its cross-sectional area (A), as follows:
In this case, we have ,
and
. So, the total resistance of the wire with length of 138m is:
A) 140 degrees
First of all, we need to find the angular velocity of the Ferris wheel. We know that its period is
T = 32 s
So the angular velocity is
Assuming the wheel is moving at constant angular velocity, we can now calculate the angular displacement with respect to the initial position:
and substituting t = 75 seconds, we find
In degrees, it is
So, the new position is 140 degrees from the initial position at the top.
B) 2.7 m/s
The tangential speed, v, of a point at the egde of the wheel is given by
where we have
r = d/2 = (27 m)/2=13.5 m is the radius of the wheel
Substituting into the equation, we find