15. An insect lands on a compact disc that is put
1 answer:
Answer:
Yes, it is accelerating
Explanation:
Acceleration is a vector quantity, which means it has both a magnitude and a direction.
Acceleration is defined as the rate of change of velocity:
where v is the velocity and t is the time.
v, the velocity, is also a vector, having both a magnitude (called speed) and a direction. This means that the acceleration is non-zero whenever the velocity is changing: this means that we have an acceleration either when the speed is changing, or also when the direction of the velocity is changing.
In the example in the question, the insect spins with the disc, so it is in circular motion. This means that the direction of the velocity of the insect is constantly changing: therefore, the acceleration of the insect is non-zero, so the insect is accelerating.
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Bruces mass is 63kg
To develop this problem it is necessary to apply the concepts related to a magnetic field in spheres.
By definition we know that the magnetic field in a sphere can be described as
Where,
a = Radius
z = Distance to the magnetic field
I = Current
Permeability constant in free space
Our values are given as
diameter of the sphere then,
Thus z = a
Re-arrange to find I,
Therefore the current at the pole of this sphere is