plz answer them correctly I beg u no tricks plz
Answers
1-It is the equilibrium between centrifugal force caused by the rotation of moon and the gravitational force between moon and earth which helds moon in its orbit.the life on earth will change and there will be a confusion in day and night
2-Applications of Archimedes principle:-
1. Archimedes principle is used to determining the relative density of the substance.
2. Archimedes principle is used in designing ships and submarines.
3-The Earth attracts all objects with the same acceleration due to gravity g. it is g which is responsible for increase of decrease of velocity. The velocity determines the height
More mass or more inertia requires more force to make the object move with the same speed. So small object requires small force to move at speed, Big object requires larger force to throw, if you give it same initial speed. Muscles give more pain. Because you give more force. But as Force = mass * acceleration, the acceleration is same.
4-Archimedes' principle states that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the weight of the fluid that the body displaces and acts in the upward direction at the Centre of mass of the displaced fluid.
5-b-Pressure is the total force per unit area.The ends of the nails and pins are made sharp in order to minimize the area which in turn increases the pressure.So when you hit the nail on its head , even a small force converts into a large pressure due to the small area of the tail and the nail is able to insert in the wall.
a-school bags are provided with broad straps because as larger the area as lesser the pressure
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