Force of Gravity
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Define gravitational mass. The mass of the earth is 6×1024 kg and that of the moon is 7.4×1022 kg. If the distance between the earth and the moon be 3.84×105 km, calculate the force exerted by the earth on the moon. (G=6.7×10−11 Nm2kg−2)
[3 MARKS]
- Gravitational Force
- Electrostatic Force
- Frictional Force
- Nuclear Force
The gravitational force of attraction between two bodies of masses 40 kg and 80 kg separated by a distance of 15 m is:
(Take Gravitational constant, G=6.673×10−11Nm2kg−2)
9.49×10−10 N
8.49×10−10 N
7.49×10−10 N
6.49×10−10 N
- Gravitational force
- Rotation of earth
- Sun's attraction
- Moon's attraction
Two spherical balls of mass 10 kg each are placed with their centers 10 cm apart. Find the gravitational force of attraction between them. Take G=6.67×10−11 Nm2kg−2
6.67×10−9 N
6.67×10−8 N
6.67×10−7 N
6.67×10−6 N
The force of attraction between two unit point masses separated by a unit distance is called
gravitational potential
acceleration due to gravity
gravitational field
universal gravitational constant
- 46.69×10−11 N
- 13.34×10−11 N
- 0
- 33.5×10−11 N
Calculate the force between two point masses of 50 kg and 100 kg separated by a distance of 10 m.
444.5×10−10 N
3.335×10−9 N
6.67×10−10 N
2.27×10−11 N
- 0
- 33.5×10−11 N
- 46.69×10−11 N
- 13.34×10−11 N
- After 2 s, the pillow is at a height of 6.4 m.
- The pillow reaches a maximum height of 11 m.
- After 2 s, the pillow is at a height of 9.8 m.
- The pillow is thrown up with a velocity of 14.7 m s−1.
- 4πr2dG
- 4πRdG3
- 34πRdG
- 4πr2G
- 4πr2dG
- 4πr2G
- 34πRdG
- 4πRdG3
- 0
- 33.5×10−11 N
- 46.69×10−11 N
- 13.34×10−11 N
( Given for x<<1 , assume 1(1−x)2≈1+2x)
- 16%
- 8%
- 2%
- 4%
- 50 N
- 100 N
- Zero
- 150 N
- magnetic field
- wind
- gravity
- clouds
- Hammer
- Coin
- Both will reach at the same time
- Insufficient information
When an object is dropped from a height, it accelerates and falls down. The force which accelerates the object is
Frictional force
Buoyant force
Gravitational force
Magnetic force
- 4πRdG3
- 4πr2G
- 34πRdG
- 4πr2dG
Weight of an object in free fall is zero. Why?
Two objects of masses 100 kg and 200 kg are placed at a distance of 10 meters from each other. Calculate the gravitational force between them.
- 4 s
20 m - 5 s
25 m - 4 s
24 m - 5 s
30 m
- weight
- horizontal displacement
- momentum
- altitude
- 33.5×10−11 N
- 0
- 46.69×10−11 N
- 13.34×10−11 N