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प्रश्न
Give one example each of central force and non-central force.
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उत्तर
Examples of central force:
- Gravitational force due to point mass.
- Electrostatic force on the point charge.
Examples of non-central force:
- The nuclear force depends upon the spin of particles.
- Magnetic systems act between two current carrying loops.
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संबंधित प्रश्न
State Kepler's law of orbit and law of equal areas.
In the Following figure shows the elliptical path of a planet about the sun. The two shaded parts have equal area. If t1 and t2 be the time taken by the planet to go from a to b and from c to d respectively,
Answer the following question.
State Kepler’s law of the period.
The square of its period of revolution around the sun is directly proportional to the _______ of the mean distance of a planet from the sun.
Write the Kepler's laws.
State Kepler’s laws.
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- all three of Kepler’s laws would still be valid.
- only the third law will be valid.
- the second law will not change.
- the first law will still be valid.
A star like the sun has several bodies moving around it at different distances. Consider that all of them are moving in circular orbits. Let r be the distance of the body from the centre of the star and let its linear velocity be v, angular velocity ω, kinetic energy K, gravitational potential energy U, total energy E and angular momentum l. As the radius r of the orbit increases, determine which of the above quantities increase and which ones decrease.
Earth’s orbit is an ellipse with eccentricity 0.0167. Thus, earth’s distance from the sun and speed as it moves around the sun varies from day to day. This means that the length of the solar day is not constant through the year. Assume that earth’s spin axis is normal to its orbital plane and find out the length of the shortest and the longest day. A day should be taken from noon to noon. Does this explain variation of length of the day during the year?
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How can an ellipse be drawn using pins and thread?
What is at one focus of the elliptical orbit of a planet?
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