Because when light enters a denser medium it is refracted towards normal. The same effect is seen when a straight stick is placed at an angle half into water. The stick appears bent at the point it enters the water. This phenomenon is called 'real and apparent depth', if you are interested.
Their mass was greater than that of the water.
it is because the view we are seeing the coin is from rarer to denser that is from air to water so the refractive index differs so the view we so the coin at the bottom of the cointer appears to be raised
As the coin submerged in water and kept at the bottom of the vessel and if it is looked right from the top then it will appear to be lifted up by a small distance such that the actual depth / apparent depth = refractive index of water. If suppose the actual height of level of water is 12 cm then the coim will be shifted up by 3 cm. So the apparent depth will be 9 cm. Hence refractive index of water = 12/9 = 4/3 = 1.333.
Friction is a sticky force that appears when 2 objects rub against each other. If you push or pull slowly friction helps pull or push the tower along with the bottom coin. If you push or pull quickly, the coins still rub, but the friction force doesn't have time to get the stack moving. So the coin shoots out without pulling the tower with it.
It is an optical illusion due to the fact that water is more dense than air and so slows the speed of light. When light travels from a less dense to a more dense material, it slows down and 'bends'.
It is recommended that you put sand or pebbles at the bottom of a terrarium to allow drainage when watering plants.
Their mass was greater than that of the water.
The small pebbles are more likely to fall through the gaps between bigger pebbles than the other way around.
At the riverbed, as it is called, are pebbles, sand, stones etc
At the riverbed, as it is called, are pebbles, sand, stones etc
Sand grains settle faster because, pebbles require more energy within the river to keep them off the bottom.
the deepening of a stream bed by pebbles rolling along the bottom of the stream
It appears to decrease
Garden soil sand is more absorbent and retains the level of moisture for a longer period of time than pebbles. Pebbles or gravel should be put at the bottom of potted plants about 1/2 - 3 inches depending on the size of the pot for drainage.
In its simplest form, erosion. More specifically, the pebbles can undergo saltation or particle transport (bottom hopping) when there is little silt in the water.
he's wiser than he appears BY A LOT
They can just live in an aquarium with the normal pebbles on the bottom that all fish live in.