QUESTIONS
1.At what condition coin and feather fall together? What is acceleration of Coin and feather at that instant? Justify your answer.
2. What is gravitational constant? Write its value. Calculate gravitational force between two masses of 10 Kg and 20 Kg if they are 10m distance.
3.The mass of sun is 2 x 1024Kg and radius of sun is 6.96 x106 m. what isweight of one kilogram mass on the surface of sun?
4.A feather and coin fall simultaneously in the surface of moon why? If mass of moon is 7.2x1022Kg and its radius 1700 Km, what will be acceleration due to gravity of moon? What will be weight of a man of 60 Kg mass on moon?
5.What is acceleration due to gravity? Stone of 1Kg and 5Kg masses are dropped from same height at lunar surface, which one will reach surface fast and why? If the mass of moon is 7.2x1022Kg and radius 1.7x103m then how much gravity does act on one kilogram mass on the same surface?
6.What is weightlessness? Write the unit of universal gravitational constant in SI system. Calculate the force with which moon pulls every kilogram of water in koshi river given that the moon is 3 x Km away from the Koshi river and mass of moon is 7.2 x1022 Kg.
7.What is gravitational field intensity? Calculate the value of acceleration due to gravity on the top of Mount Everest of height 8848m. The mass of earth is 6 x 1024Kg and its radius is 6400Km.
8.The probability of getting hurt is more when man jumps from greater height why? The mass of earth is 6 x1024 Kg and its radius is 6400 Km. What is the mass of man weighting 977N in a spring balance?
9.Write the relation of gravitational force between two bodies and their distance. The mass of earth is 6 x 1024 Kg and the radius of moon is ;1700Km. Calculate the gravitational field intensity of new earth which is formed by compression of earth equal to size of moon.
10.What do you understand by weightlessness due to free fall? Calculate the value of acceleration due to gravity on the top of Mount Everest of height 8848m. The mass of earth is 6 x 1024Kg and its radius is 6400Km.
11.What is gravitational constant? Write its value. Calculate gravitational ;force between two masses of 20 kg and 50 kg are at a distance 500 cm apart.
12.State NewtonÃ¢â‚¬â„¢s universal law of gravitation. A piece of stone and feather are dropped from the same height at Lunar surface, Which one will reach the surface fast and why? Let mass of earth is 6xKg and its radius 6380 Km . What is gravitational force between earth and object of 400 Kg on the surface of earth?
13.What is meant by gravitational constant? The probability of getting man hurt is more when a man jumps from greater height why? A stone is dropped freely from 45m height, it reaches the ground in 3S. Calculate the acceleration due to gravity of stone.
14.What is gravitational constant? Write its value. Calculate gravitational force between two masses of 20 kg and 50 kg are at a distance 500 cm apart.
15.State NewtonÃ¢â‚¬â„¢s universal law of gravitation. An object with mass 6 x 1021Kg and other with mass 3 x1024 Kg are at distance 2 x m. Find the gravitational force between them.
16.What is weightlessness? Write the unit of universal gravitational constant in SI system. Calculate the force with which moon pulls every kilogram of water in koshi river given that the moon is 3 x Km away from the Koshi river and mass of moon is 7.2 x 1022Kg.
17.Where does body falls faster at polar region or at equatorial region why? The mass of earth is 6 x1021 Kg. Study the given diagram and calculate the gravitational field intensity at the point Ã¢â‚¬ËœAÃ¢â‚¬â„¢. Also calculate the weight of body of mass 50Kg at that point.
18.What is free fall? What will be the weight of body at this condition? The mass of earth is 6 x 1024 Kg and the radius of earth is 6400Km, what will be value of Ã¢â‚¬ËœgÃ¢â‚¬â„¢ at distance of 3600Km far from earthÃ¢â‚¬â„¢s surface.
19.What is gravitational force? What are two factors that affect gravitational force? The mass of Jupiter is 1.9x1027Kg and that of sun is 2 x 1030Kg. The distance between Jupiter and sun is 76.8 x108 Km. Calculate gravitational force that exists between them.
20.What are differences between fall of parachute on earth and that on the moon? What is effect of gravity on falling object? If two masses Ã¢â‚¬ËœXÃ¢â‚¬â„¢ Kg and 200Kg are at distance of 20m and gravitational force of attraction between them is 3.335xN. Calculate the value of Ã¢â‚¬ËœXÃ¢â‚¬â„¢ in gm.
21.Define acceleration due to gravity. Write SI unit of weight of an object. Calculate the weight of mass of the body of 20Kg which is at a distance 3x 105Km from the center of the earth with mass 6x1024 Kg
22.Give difference between gravitation and gravity. An apple of mass 5Kg fall from tree. If the mass and radius of earth are 6 x 1024Kg and 6400 Km respectively. Find acceleration of falling apple.
23.Write the relation of gravitational force between two bodies and their distance. The mass of earth is 6 x Kg and the radius of moon is 1700Km. Calculate the gravitational field intensity of new earth which is formed by compression of earth equal to size of moon.
24.The probability of getting hurt is more when man jumps from greater height, why? The mass of earth is 6 x1024 Kg and its radius is 6400Km. What is the mass of man weighting 977N in a spring balance?
25.What is free fall? What will be the weight of body at this condition? The mass of earth is 6 x 1024 Kg and the radius of earth is 6400Km, what will be value of Ã¢â‚¬ËœgÃ¢â‚¬â„¢ at distance of 3600Km far from earthÃ¢â‚¬â„¢s surface.
26.What do you understand by weightlessness due to free fall? Calculate the value of acceleration due to gravity on the top of Mount Everest of height 8848m. The mass of earth is 6 x 1024Kg and its radius is 6400Km.
27.What are the differences between gravity & gravitation? Find the acceleration due gravity on the top of the Mount Everest is 8848m above the sea level. The mass of the earth is 6x10 24 kg and its radius is 640000m.( ans : 9.74).
28.What is gravitational field intensity? Calculate the value of acceleration due to gravity on the top of Mount Everest of height 8848m. The mass of earth is 6 x Kg and its radius is 6400Km.
29.What is free fall? What effect will be on acceleration due to gravity if radius of the earth is decreased. A man of 100 kg mass on the surface of the earth which has 6x1024kg mass. If radius of the earth is 6400km then calculate the gravitational force between them.
30.Write down the effect due to gravitational force of sun & moon on the earth. At what condition the value of acceleration due to gravity is approximately zero, while getting down from the parachute. At what condition the gravitational force F, becomes 6.6x10-11N?
31.What is gravitational constant? Write its value. If mass of the earth is 6x1024 kg & radius is 6400km, what will be the weight of 300kg mass of an object on the surface of the earth?[ ans : 2931N]
32.What is gravity. We do not get hurt when we jump with parachute, why? Find out the change in gravitational force between two bodies of fixed arms, when placed at double distance.
33.What is gravitational force? What are two factors that affect gravitational force? The mass of Jupiter is 1.9x1048 Kg and that of sun is 2 x1027 Kg. The distance between Jupiter and sun is 76.8 x 1030 Km. Calculate gravitational force that exists between them.
34.What are two factors that affect force of gravitation? The weight of object is more at polar region than at equatorial region why? A man can lift 50kg mass on the surface of earth, how much mass can he lift on the surface of moon?
35.In which direction does the force of gravity act? Why do the satellites do not fall while revolving around the earth? To estimate the height of the Koshi bridge over a river, a stone is dropped freely in the river from the bridge. The stone takes 2 sec to touch the water surface. Calculate the height of the Koshi bridge.[19.6m]
36.In which condition do the feather and coin fall from the same height at the same speed, why? What change occurs on the gravitational force between two bodies when the mass of each are doubled and distance between their centers is halved? Calculate.
37.Write one effect seen on the sea due to gravitation of the sun & moon. Where If your weight is 50N on the earth, how far you should go from the center of the earth so that your weight will be 300N? (R=4.4x106m)
38.State NewtonÃ¢â‚¬â„¢s universal law of gravitation. An object with mass 6 x 1021Kg and other with mass 3 x1024 Kg are at distance 2 x105 m. Find the gravitational force between them.
39.What is gravity? What is value of Ã¢â‚¬ËœgÃ¢â‚¬â„¢ at equatorial region of earth? Write in SI unit. Calculate force Of gravitation between the earth and man having mass 80 Kg, if the mass of earth is 6 x 1023Kg and radius of earth is 6.38 x105 m.
40.What should be the distance between two bodies if the force acting between them is 5x10-18 N and mass of one body is one fourth ofanother one is equal to 2000 kg.
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