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As soon as the card drops a little there is 1) a volume expansion that counteracts the displacement and 2) a thin water rim is formed between the edge of the cup and the card. If the weight of the card is low, a few grams , the surface tension of water is sufficient to prevent air from penetrating the cup. Therefore card is kept in place by the capillary force.
With a card of somewhat greater weight the width of the capillary rim increases (but there is additional volume expansion to counteract the weight of the heavier card). Since the capillary force decreases with increasing width of the open edge, the weight range of cards is limited. Eventually it can no longer prevent air from rushing in. But with cards with low weights, thus a thin edge and as a consequence a high capillary force it works fine.
What else can I help you with?
Why does water does not fall from glass when covered with paper and place inertly?
The water stays in the glass when covered with paper and inverted due to air pressure. The air pressure pushing up on the paper is greater than the force of gravity trying to pull the water out, creating a seal that prevents the water from falling out.
Explain why the cardboard did not fall to the ground when the glass of water was tipped upside down?
The cardboard did not fall to the ground when the glass of water was tipped upside down because the air pressure on the top surface of the cardboard was greater than the water pressure holding it down. This created a force that pushed the cardboard against the glass and prevented it from falling.
When an empty glass is inverted into a tub of water. Why the water does not enter the glass?
The air pressure inside the glass is stronger than the water pressure outside, creating a barrier that prevents the water from entering the glass. This is due to atmospheric pressure pushing down on the surface of the water and keeping it from filling the inverted glass.
How do you turn a glass full of water upside down without spilling it?
One way to turn a glass full of water upside down without spilling it is to place a piece of cardboard or a small plate over the mouth of the glass, then flip the glass upside down while holding the plate/cardboard in place. Once the glass is upside down, carefully remove the plate/cardboard to reveal the water remaining in the glass.
What happened according to Newton's Law of Inertia and Law of Motion when you slowly pulled the cardboard that had a coin sitting on it with the cardboard covering a glass of water Explain?
According to Newton's Law of Inertia, the coin on the cardboard would tend to stay at rest when the cardboard is pulled slowly due to its inertia. As you pull the cardboard, the coin will initially stay in place relative to the glass of water due to its inertia. However, when the force increases or the cardboard is pulled quickly, the coin will slide off the cardboard due to the force exerted on it.
Why does water does not fall from glass when covered with paper and place inertly?
The water stays in the glass when covered with paper and inverted due to air pressure. The air pressure pushing up on the paper is greater than the force of gravity trying to pull the water out, creating a seal that prevents the water from falling out.
Explain why the cardboard did not fall to the ground when the glass of water was tipped upside down?
The cardboard did not fall to the ground when the glass of water was tipped upside down because the air pressure on the top surface of the cardboard was greater than the water pressure holding it down. This created a force that pushed the cardboard against the glass and prevented it from falling.
When we take a glass of half filled water and a small piece of cardboard on the top press then invert it.the cardbord remains attached with glass water doesn't falls.why is it so?
The air pressure in the air under the cardboard is pushing up, thus keeping the cardboard and water in the glass.
When an empty glass is inverted into a tub of water. Why the water does not enter the glass?
The air pressure inside the glass is stronger than the water pressure outside, creating a barrier that prevents the water from entering the glass. This is due to atmospheric pressure pushing down on the surface of the water and keeping it from filling the inverted glass.
How do you turn a glass full of water upside down without spilling it?
One way to turn a glass full of water upside down without spilling it is to place a piece of cardboard or a small plate over the mouth of the glass, then flip the glass upside down while holding the plate/cardboard in place. Once the glass is upside down, carefully remove the plate/cardboard to reveal the water remaining in the glass.
What happens to the cardboard and the water inside the glass?
when water is filled up to the brim then water and cardboard are in complete contact with each other , there is no space for air to enter in ...... so it creates a sort of cacuum....and when glass is turned upside down then that created vacuum leads to the hanging of cardboard on its own
The depth to which an inverted drinking glass must be pushed beneath the surface of water so that the volume of enclosed air is squeezed to half is?
The inverted drinking glass must be pushed to a depth where the water level inside the glass is halfway between the original water level and the top of the glass. This ensures that the volume of enclosed air is squeezed to half.
What will happen if one glass inked cold water placed inverted over another inked hot water glass?
It would make a warm inked water! (I think this may not be true)
A glass is inverted over a basin of water and slowly inserted into the water. however the water does not enter the glass. this experiment proves that water cannot be compressed?
The experiment demonstrates that water cannot enter the inverted glass due to air pressure. As the glass is submerged, the air inside it prevents water from filling the space, creating a seal. This illustrates that liquids, like water, are incompressible under normal conditions, as they cannot be squeezed into the glass while the air pressure remains. Therefore, the inability of water to enter the glass is a result of air pressure rather than a direct proof of water's incompressibility.
What happens to the match box case as you pull the cardboard abruptly to the side explain?
the ping-pong ball is drown in the glass filled with water, or maybe it will join the cardboard..
What happened according to Newton's Law of Inertia and Law of Motion when you slowly pulled the cardboard that had a coin sitting on it with the cardboard covering a glass of water Explain?
According to Newton's Law of Inertia, the coin on the cardboard would tend to stay at rest when the cardboard is pulled slowly due to its inertia. As you pull the cardboard, the coin will initially stay in place relative to the glass of water due to its inertia. However, when the force increases or the cardboard is pulled quickly, the coin will slide off the cardboard due to the force exerted on it.
What are 4 things you can safely recycle?
* Paper * Plastic water bottles (but not the cap) * Cardboard * Glass bottles
