see 2080 model questions science with answer (chapter: Force and Motion)

 

1. Mass of the moon is 7x10 ²²kg and its radius is 17km. If the moon is 3.82x10⁵km away form the earth calculate:  i). Gravitational force between the moon and 10 kg water of Narayani River.  ii). Acceleration due to gravity on the moon surface.
2. A heavenly  body has mass half less than that of the earth its radius is half as that of the earth. If the stone wights 100N on the earth' surface, finds its weight on the heavenly body   {Ans: 200N}
3. The mass of the moon is 7.4x10 ²²kg. Its radius is 1140 km. Calculate the acceleration due to gravity on the moon surface.
4. Mass of  planet is 6x10 ²⁰ kg and its radius is 3x10⁵m. Calculate the acceleration due to gravity on the surface of the planet.
5. Calculate the weight of the mass of a body of 20kg which is at a distance 3x10⁵ km from the center of the earth with mass 6x10 ²⁴kg.       {Ans: 8.89x10 ^-2 N}
6. If the mass of moon is 7.2x10 ²²kg radius 1.7x10⁶m then how much gravity does act on 1 kg mass on the same surface?       { Ans: 1.6N}
7. A body weights 63 N on the surface of the earth. What is the gravitational force on it due to the earth at a height 3200 km from the earth's surface( Radius of the earth is 6400 Km)
8. A heavenly body has a mass half that of the earth and its radius half as that of the earth. If a stone weighs 100N on the surface of the earth, find its weight on the heavenly body.
9. The mass of the moon is 7.2x10 ²²kg and its radius is 1.7x10 6m. What will be the gravity of the moon to a body of mass 1kg on the surface of the moon?
10. Earth has the mass of 6x10 ²⁴ kg and a radius of 6380 km. What will be the gravity of the earth to a body of mass 1kg on the surface of the earth?

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