physics-9-chapter-4-turning-effect-of-force-5


1. The acceleration due to gravity on the surface of moon is 1.62 ms-2. The radius of moon is 1740 km. Find the mass of moon?




2. Which of the following will be equal in the action and reaction due to force of gravitation?




3. Calculate the value of g at a height of 3600 km above the surface of the Earth?




4. Which of the following will be different in the action and reaction due to force of gravitation?




5. With which law, the Newton’s law of gravitation is in consistent?




6. Which of the following law is in consistent with Newton’s third law of motion?




7. Which of the following law states that to every action there is always an equal but opposite reaction?




8. Two lead spheres each of mass 1000 kg are kept with their centres 1 m apart. Find the gravitational force with which they attract each other?




9. What is the formula of the gravitational force between a body of mass m and the Earth?




10. What is ‘Me’ in the formula: F = [G (m x Me)] / r2?




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