A high-speed flywheel in a motor is spinning at 500 rpm when a power failure suddenly occurs. The flywheel has mass 39.0 kg and
diameter 80.0 cm. The power is off for 32.0 s and during this time the flywheel slows due to friction in its axle bearings. During the time the power is off, the flywheel makes180 complete revolutions.
A. At what rate is the flywheel spinning when the power comes back on? (rad/s)
B. How long after the beginning of the power failure would it have taken the flywheel to stop if the power had not come back on? (s)
C. How many revolutions would the wheel have made during this time?
A. At what rate is the flywheel spinning when the power comes back on? (rad/s)
B. How long after the beginning of the power failure would it have taken the flywheel to stop if the power had not come back on? (s)
C. How many revolutions would the wheel have made during this time?
1 answer:
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Answer:
Explanation:
Assuming the pith balls as point charges, we can calculate the repulsive force between them, using Coulomb's law:
We observe that the magnitude of the electric force is directly proportional to the product of the magnitude of both signed charges() and inversely proportional to the square of the distance(d) that separates them.
Replacing the given values, where k is the Coulomb constant: