The density of copper is 8.9 g cm-3.Calculate the relative density of copper.
9.8
8.9
7.5
1
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
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
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
S.I unit of gravitation constant 'G' is
Nm2 kg2
Nm2/kg2
N/m2 kg2
N/m2 kg-2
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
For a freely falling body (falling vertically down wards) 'g' is
Negative
Positive
Zero
None of these
The mass of a body is measured to be 12kg on earth. If it is taken to moon, the mass will be:
72kg
2kg
12kg
24kg
According to Kepler's Laws of Planetary Motion :
r2 α T3
r α T2
r3 α T2
r3 α 1/ T2
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
