Sarthak Shakya

When we sit in a in a straight-backed chair, our centre of gravity is lower and we are more stable and when we try to stand up without leaning forward, we can't do this because when we apply a force on our body and a torques is produced but the line of action not going outside the base and we get back to our position that's why we can't do this

Practically, it is impossible to create an ideal simple pendulum because we can’t have a point mass and heavy solid metallic sphere (bob) tied to one end of a long unspun cotton thread and suspended from rigid support to serve the purpose of a simple pendulum.

The time period (T) of a simple pendulum is defined as,

T = 2π L/g

Here, L is the length of the pendulum and g is the acceleration due to gravity.

So the period of oscillation is independent of mass but depends on length. Thus length and time period is the fundamental property of a pendulum. Therefore, length and time be based on properties of a pendulum but the mass does not.

When a singer holds a note of a particular frequency which is equal to the natural frequency of the glass, it will vibrate with great amplitudes. As a result the glass may be blown apart in pieces.

If the glass quality is low, the resonance frequency cannot be matched with its right natural frequency. That is why it cannot be done if the glassware quality is low