Answer:
The moment arm is 0.6 m
Explanation:
Given that,
First force 
Second force 
Distance r = 0.2 m
We need to calculate the moment arm
Using formula of torque

So, Here,

We know that,
The torque is the product of the force and distance.
Put the value of torque in the equation


Where,
=First force
=First force
=Second force
= distance
Put the value into the formula


Hence, The moment arm is 0.6 m
Force on electron due to electric field is given by



now the acceleration is given by



so above is the magnitude of acceleration and its direction is opposite to field as electron is negatively charged so direction is towards SOUTH
Explanation:
Given
radius


mass disc 
mass of person 
velocity of Person 
moment of inertia 

Initial angular momentum



Final Moment inertia


final angular momentum

Conserving angular momentum



Answer:
F = [MLT⁻²]
Explanation:
Force = ma
m (mass) = [M]
a (acceleration) = [LT⁻²]
F(force) = m x a = [MLT⁻²]