A thin, circular hoop with a radius of 0.32 m is hanging on a nail. Adam notices that the hoop is oscillating back and forth through small angles like a physical pendulum. The moment of inertia of the hoop for the rotational axis passing through the nail is I = 2mr^2. What is the period of the hoop?

1.605 s

Explanation:

radius of hoop = 0.32 m

moment of inertia

period P of a hoop is given as

since  

therefore the period of the hoop reduces to

where  = acceleration due to gravity = 9.81 m/s^2

= 1.605 s

current and voltage can both be different in different parts of a circuit so it matters where you place the ammeter and voltmete