Ch 6 Physics Class 9
Important easy to understand Notes of Ch 6 Physics Class 9 English Medium written by Professor Sulman Arif Suib. These notes are very helpful in the preparation of Physics for students of the 9th class Physics English Medium and these are according to the paper patterns of all Sindh Book Boards.
Summary and Contents:
Topics which are discussed in the notes are given below:
- State and explain Newton's law of gravitational.
- Differentiate between G and g.
- Give characteristics of gravitational force.
- Define gravitational field.
- Different between natural and artificial satellite.
- Define orbital velocity.
- List where the artificial satellite is being used.
- List the orbits where artificial satellite been launched.
- Derive relation for mass of earth with the help of Newton's Law of gravitational formula. Also calculate the mathematical value of mass of Earth.
- Solved Numerical of the exercise Ch 6 Physics Class 9.
- Determine the gravitational force of attraction between two spherical bodies of masses 500km and 800km. Distance between their centres is 2 metres.
- Calculate the weight of Rumaisa, who has a mass of 65kg standing at the ground. The strength of the gravitational field on Rumaisa is 10 Newton per kilogram?
- Calculate the acceleration due to gravity on a planet that has mass two times to the mass of earth and radius 1.5 times to the radius of Earth. If the acceleration due to gravity on the surface of earth is 10ms-2. Calculate the acceleration due to gravity on the planet?
- Calculate the speed of a satellite which orbits the earth at an altitude of 1000 km above the earth's surface?
- Determine the gravitational force of attraction between Urwa and Ayesha standing at a distance of 50m apart. The mass of Urwa is 60km and that of Ayesha is 70km.
- Weight of Rani is a 450N at the surface of Earth. Find her mass?
- The weight of Naveera is 700N on the Earth's surface. What will be Naveera's weight at the surface of moon? (gm = 1.62ms-2).
- A planet has mass four times of earth and radius two times that of Earth. If the value of g on the surface of earth is 10ms-2. Calculate the acceleration due to gravity on the planet.
- Calculate the speed of a satellite which orbits the earth at an altitude of 400kilometers above the earth's surface.