We need it to calculate the how big it is, it’s mass, or even volume to get the measurements of lots of objects
Part a)
Centripetal acceleration is defined as

now here we know that


m = 3 kg
now from above formula we have


Part b)
Maximum possible tension in the string is given as

now by force equation we have



now again by above formula



Answer:
Explanation:
Given that, current generated from lightning range from
10⁴ A < I < 10^5 A
We know that,
The magnetic force is given as
F = iLB
The magnetic field on the earth surface is
B = 10^-5 T
So, let assume the worst case of a 15m flag pole
L = 15m
Then,
F = iLB
F = 10^5 × 10 × 10^-5
F = 15 N
Therefore, 15N is fairly strong so it will come to the material that was use for the material of the flag pole.
Therefore, it is possible that the student is right depending on the material of the flag pole.
Your weight would change but not your mass, the moon has less gravity so therefore you are going to be lighter :-)