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Why do Bic pens have a hole in the middle?

If it was completely airtight, then the pressure inside would drop, preventing ink flow. Placing a hole in the middle equalises the pressure and controls the flow of ink. The hole, basically, stops the pen from leaking ink.


Which melts faster ice with hole in middle or cubed ice?

Ice with a hole in the middle will melt faster than cubed ice. This is because the hole allows more surface area to be exposed to the surrounding temperature, leading to quicker melting. Cubed ice, on the other hand, has less surface area exposed, slowing down the melting process.


What effect does a hole in middle of the parachute have on the behaviour of the parachute?

A hole in the middle of a parachute can disrupt the airflow, causing the parachute to lose stability and potentially spin uncontrollably. This can lead to a faster descent and reduce the effectiveness of the parachute in slowing down the fall. It is important for a parachute to be intact and properly functioning to ensure a safe landing.


Can the the flame of closed air hole Bunsen burner can used for heating?

Yes, the flame of a Bunsen burner with a closed air hole can still be used for heating, but it will produce a cooler, more yellow flame compared to a Bunsen burner with an open air hole. Adjusting the air hole allows for control of the flame temperature.


Could the center of mass exist in a hole within the body?

Yes, the center of mass could potentially be located inside a hole within a body if the distribution of mass is such that the center of mass ends up there. The concept of center of mass is a point where the body's total mass can be considered to be concentrated, regardless of its physical shape.