In which situation is the gravitational force between two objects hard to detect?
A. if the mass of one of the objects is very great
B. if the mass of both objects is very great
C. if the objects are very close together
D. if the mass of each object is very small
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D.

Explanation:

Newton's Law of Gravitation states that:

If the masses of each object is small, then would be very small, making the gravitational force between the two objects hard to detect - as it itself would be very small.

Answer&Explanation:

According to the Newton gravitational law is directly proportional to the Product between masses and inversely proportional to the square of the distance..

Hence from the law and corresponding question the correct answer is D:if the mass of each object is very small

Thus it would make it undetectable

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.