A force of 860 N is applied at a point 1.9 m from the axis of rotation, causing a revolving door to accelerate at 426.52 deg/s2. What is the moment of inertia of the door from its axis of rotation

3.629 Kg

Explanation:

Force=F= 860 N

Distance from Center of rotation= r= 1.9 m

Angular acceleration= α = 426.52 deg/sec2

We use the relation;

τ = I α

where,

τ = Torque

I = moment of inertia

==> F× r = I ×426.52

==> 860×1.8 = I × 426.52

==> 1548 =  I × 426.52

==> I = =  3.629 Kg

0.55x745.7j and a calculator

multiply 2kg by latent heat of vap