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
If the masses of both the object are doubled, the gravitational force of attraction is
Doubled
Halved
Becomes 4times
Becomes (1/4)th
The weight of a body on the moon is one - sixth of its weight on the earth.How will the mass of the body vary ?
becomes 1/6 th
remains the same
becomes 6 times
becomes 1/8 th
For a freely falling body (falling vertically down wards) 'g' is
Negative
Positive
Zero
None of these
S.I unit of gravitation constant 'G' is
Nm2 kg2
Nm2/kg2
N/m2 kg2
N/m2 kg-2
A ball is thrown up with a speed of 15 m/s.How high will it go before it begins to fall? (g = 9.8 m/s2)
13.4 m
12.4 m
11.4 m
14.5 m
Every object in the universe attracts every other object with a force which is inversly proportional to
square of the distance
cube of the distance
distance
two times the distance
An apple falls towards the earth because the earth attracts it.The apple also attracts the earth by the same force.Why do we not see the earth rising towards the apple?
Acceleration of the earth is very large when compared to that of apple
Acceleration of the earth is equal to that of apple
Acceleration of the earth is neither high nor too low
Acceleration of the earth is very small when compared to that of apple
S.I unit of pressure is
pascal
torr
tesla
bar
Who gave three laws of planetary motion?
Newton
Kepler
Einstein
Galileo
