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A wave has a frequency of 45 Hz. What is its period in seconds? Round to 3 nonzero digits.

If the gravitational force between two objects is 3.5 x 10-11 N and the distance between them is increased by a factor of 4, what is the new gravitational force? Type in the power of ten.

If the gravitational force between two objects is 3.5 x 10-11 N and the distance between them is increased by a factor of 4, what is the new gravitational force? Type in the prefix.

If M1 is increased by a factor of 8 and M2 is increased by a factor of 5 while the distance between them is doubled (x2), what is the new force?