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B is the correct option.If a rock is brought from the surface of the moon to the earth, its weight will change but not its mass. Mass is an invariant physical quantity whereas weight of a body (w = mg) is variable as the value of acceleration due to gravity (g) changes
A body is weighed at the poles and then at the equator. The weight
A body weighs more at the poles than at the equator, because the earth is not a perfect square, but it is flattened at the poles. The distance between the equator and the center of the earth is less than at the poles; therefore the force of gravitation is more at the poles than at the equator; and so it weighs more at the poles than equator.
Hence, the weight of a body at the poles will be greater than at the equator.
Consider a satellite going round the earth in a circular orbit. Which of the following statements is wrong ?
Centripetal acceleration works on it.
A missile is launched with a velocity less than the escape velocity. The sum of its kinetic and potential energy is
In SI units, G has the value 6.67 × 1011 Newtons kg2 m2. The direction of the force is in a straight line between the two bodies and is attractive. Thus, an apple falls from a tree because it feels the gravitational force of the Earth and is therefore subject to “gravity”.
So all objects, regardless of size or shape or weight, free fall with the same acceleration. In a vacuum, a beach ball falls at the same rate as an airliner. ... The remarkable observation that all free falling objects fall with the same acceleration was first proposed by Galileo Galilei nearly 400 years ago.
At the center gravity is 0 ,gravity decreases as we go down into the earth ,also it decreases as we go above the surface of earth.
So weight w = mg is maximum on the surface because at surface the value of g is maximum.
If the distance between two masses be doubled, then the force between them will become
The Gravitational force between two objects is inversely proportional to the square of distance between them.
So, if the distance between two objects is doubled, then the gravitational force becomes 1 / 2x2.
That is ¼.
The correct answer is C as body falls freely towards the earth with uniform acceleration (g).
If the mass of a body is M on the surface of the earth, then its mass on the surface of the moon will be
The correct option is B.
Mass of the body is universally the same. It is not affected by acceleration due to gravity and thus is the same everywhere. Hence, mass of body will be same i.e. M at both earth surface & moon surface.
A geostationary satellite revolves around the earth with the same angular velocity and in the same sense as done by the earth about its own axis, i.e. westeast direction. A polar satellite revolves around the earth's pole in northsouth direction.
The correct answer is A as The force of gravitation exists Everywhere in the universe
Mass of oil is 11040 kg and volume is 12 m³, its density would be
Density,
ρ = M / V = 11040 / 12
= 920 kg/m³
The mass of the Jupiter is 1.9 × 10^{27} kg and that of the sun is 1.99 × 10^{38 }kg. The mean distance of the Jupiter from the sun is 7.8 × 10^{11} m. Speed of the Jupiter is (assuming that Jupiter moves in a circular orbit around the sun)
F = GMm / r²
= 6.67×10¹¹ × (1.99×10³⁰) × (1.9×10²⁷) / (7.8×10¹¹)²
= 4.14×10²³ N
Now let its speed of jupiter be v, then
F = mv² / R
⇒ v =√(FR / m)
=√{(7.8×10¹¹)×(4.10×10²³) / (1.9×10²⁷)}
= 1.304×10⁴ m/sec
Weight is nothing but the force of attraction exerted by the earth on a body.
Now since the SI unit of force is Newton and the weight is also a force, this means that the SI or weight is Newton as well.
Gravitational force which acts on 1 kg is 9.8 N.
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