Answer:
Phenomena is the plural form of Phenomenon.
A phenomenon is an extraordinary occurrence or circumstance.
Simple harmonic motion is defined as a periodic motion of a point along a straight line, such that its acceleration is always towards a fixed point in that line and is proportional to its distance from that point.
Why is it called simple harmonic motion?
The motion of a particle moving along a straight line with an acceleration whose direction is always towards a fixed point on the line and whose magnitude is proportional to the distance from the fixed point is called simple harmonic motion.
Why is SHM important?
Whilst simple harmonic motion is a simplification, it is still a very good approximation. Simple harmonic motion is important in research to model oscillations for example in wind turbines and vibrations in car suspensions.
What are two basic characteristics of SHM?
Solution : The two basic characteristics of a simple harmonic motion : (i) Acceleration is directly proportional to displacement.
(ii) The direction of acceleration is always towards the mean position, that is opposite to displacement.
Learn more about simple harmonic motion:
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By definition, the centripetal acceleration is given by:

Where,
v: tangential speed
r: radius of the circular path
Clearing the radio we have:

Substituting values we have:

Therefore, the radius of the circular path is equal to 0.60 meters.
Answer:
The radius of the circle is:
0.60 m
option1
It's still 20 kg. Mass doesn't change according to gravity, only weight changes.
The answer is B because it's 80 percent copper, that's a greater number then 20.