sorry but, I have the same problem with the same numbers and 3.8 seconds is not the answer according to the computer program that grades the problem.
Also when I solve for K as you stated, K= (T/2pi)^2*(1/12)ML^2
When you insert that back into the original equation...
In order for an object to be in static equilibrium
a)the net force in all directions must be zero
b)the net torque must be zero
c) the object's velocity must be zero
d) a and b are correct
e) all of the above
2. I know that the net force in all directions must be equal to zero...
so if I understand this correct then m*g*r*H=m*a
where m is the mass of the fridge, g is acceleration due to gravity, r is the radius it rotates around =4m? , H is the height of the fridge=8 meters, and a is the acceleration of the truck
This gives a huge acceleration, which can't be right...