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Kepler’s 1st Law: Law of Orbits
Statement: - The orbit of every planet is an ellipse around the sun with sun at one of the two foci of ellipse.
Kepler’s 2nd law: Law of Areas
Statement:-The line that joins a planet to the sun sweeps out equal areas in equal intervals of time.
Kepler’s 3rdLaw: Law of periods
Statement: -
- According to this law the square of time period of a planet is ∝ to the cube of the semi-major axisof its orbit.
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- Robert Hooke was the scientist who gave Hooke’s law.
- Hooke’s law states that within the elastic limit, stress developed is directly proportional to the strain produced in a body.
- Consider a scenario where we apply external force to the body. As a result stress develops in the body due to this stress there will be a strain produced in the body which implies that there will be some deformation in the body.
- Because of stress, strain is produced.
- According to Hooke’s law, if strain increases the stress will increase and vice-versa.
- The Hooke’s law is applicable to all elastic substances.
- It does not apply to plastic deformation.
- Mathematically :
- stress ∝ strain
- stress = k × strain
- Where k is the proportionality constant and is known as modulus of elasticity.
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Thermodynamics
- It is the branch of physics which deals with process involving heat, work and internal energy.
- Thermodynamics is concerned with macroscopic behavior rather than microscopic behavior of the system.
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