PHYSICS
posted by MYRA
What major obstacle did Henry Cavendish face when measuring the gravitational force between two objects on Earth?
A) The masses required had to be very small.
B) The gravitational force between the two masses
was very small.
C) The distance between the two masses had to be
extremely large.
D) The gravitational force between the two masses
was extremely large.

Elena
B) The gravitational force between the two masses was very small.

myra
can u pls explain to me y is it the and B)
....thank you very much elena .... :) 
Elena
Gravitational force is F=G•m1•m2/R²,
where the gravitational constant G = 6.67•10^11 N•m²/kg².
This constant is very small, therefore, the gravitational interaction between usual objects is very small too.
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