Give scientific reasons for:-
Why dams are constructed on rivers
It is easy to swim in swimming pool than in river
A raised hammer can penetrate a nail in a wooden
No work is done by planet while moving around the sun
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1. A dam is built to control water through placement of a blockage of earth, rock and/or concrete across a stream or river. Dams are usuallyconstructed to store water in a reservoir, which is then used for a variety of applications.
2. This makes swimming a bit easier in salt water than fresh water. You never swim on top of the water like a boat. ... Sea water is more densethan fresh river water because of its dissolved salts.
3. there's the issue of acceleration. Hammers are very hard and solid, so when you hit the nail head with the hammer, the energy and force of the blow is delivered at almost an instant.
4.Newton realized that the reason theplanets orbit the Sun is related to why objects fall to Earth when we drop them. The Sun's gravity pullson the planets, just as Earth's gravity pulls down anything that is not held up by some other force and keeps you and me on the ground.
hope this will help you :-))
2. This makes swimming a bit easier in salt water than fresh water. You never swim on top of the water like a boat. ... Sea water is more densethan fresh river water because of its dissolved salts.
3. there's the issue of acceleration. Hammers are very hard and solid, so when you hit the nail head with the hammer, the energy and force of the blow is delivered at almost an instant.
4.Newton realized that the reason theplanets orbit the Sun is related to why objects fall to Earth when we drop them. The Sun's gravity pullson the planets, just as Earth's gravity pulls down anything that is not held up by some other force and keeps you and me on the ground.
hope this will help you :-))
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Dams is a barrier across the following water. It is used to stop the flow of water of a river. If dams are not constructed on it than it will led to tsunami. The water which is stop by the dams is also used for making hydroelectricity.
This is because the density of swimming pool is equal to 1 cm cube so we easy to swim in it but in river the density is more than 1cm cube so it is not so easy to swim in river and also due to more or less amount of salt
This is because the density of swimming pool is equal to 1 cm cube so we easy to swim in it but in river the density is more than 1cm cube so it is not so easy to swim in river and also due to more or less amount of salt
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