Force of gravitation is
Always the force of attraction
Always the force of repulsion
Either attraction or repulsion
None of these
When you put an object on a spring balance,do you get mass of an object or its weight ?
weight
force
mass
acceleration
The equation for the Universal Law of Gravitation is :
F = Gm1m2/r2
F = Gr2/ m1m2
F = G(m1/m2)r2
F = (m1m2/r2)
Two protons are kept at a separation of 1 femtometre (1 femtometre = 10-15 m ).The mass of a proton is 1.67 x 10-27 kg.The gravitational force between them is :
1.86 x 10-34 N
5.86 X 10-34 N
2.8 X 10-34 N
4.86 X 10-34 N
The earth attracts a body of mass 2kg kept on its surface with a force of
9.8 N
6.67 x 10-11 N
1 /9.8 N
19.6 N
Kepler’s concept propounded that the
Sun was stationary at the centre of the universe with the planets revolving around it in orbits.
The earth is stationary and is at the centre of the Universe, with the sun , moon, planets and stars, revolving around the earth.
Planets revolving around the sun in elliptical orbits with the sun at one of the foci of the ellipse.
For a freely falling body (falling vertically downwards) acceleration due to gravity, 'g' is
negative
positive
zero
none of these
Every body in the universe attracts every other body with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. The force acts between the line joining the two bodies. Which law is this?
Universal Law of Gravitation
Universal Law of Attraction
Universal Law of Repulsion
Law of Conservation of Energy
Heliocentric Theory was proposed by
Ptolemy
Copernicus
Tycho Brahe
Kepler
Newton analysed that objects fall to the ground because of
gravity
inertia
