The density of copper is 8.9 g cm-3.Calculate the relative density of copper.
9.8
8.9
7.5
1
The earth attracts a body of mass 2kg kept on its surface with a force of
9.8 N
19.6 N
6.67 x 10-11N
1/9.8 N
S.I unit of weight is:
kg
N
N/kg
N/m
If the distance between two objects is halved ,then the gravitational force of attraction is
Doubled
Halved
4 times
Becomes(1/4)th
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
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
A solid of weight 22 N is dipped in water.If the weight of the solid in water is 20 N,what is the relative density of the solid ?
2
5
11
14
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
The weight of a body of mass 5 kg is
69.0 N
79.0 N
49.0 N
39.0 N
According to Kepler's Laws of Planetary Motion :
r2 α T3
r α T2
r3 α T2
r3 α 1/ T2
