Which of the following measurements has three significant figures? A) 0.005 m B) 510 m C) 0.510 m D) 0.051 m E) 5100 m

The measurement that has three significant figures is C) 0.510 m.

Here's why:

A) 0.005 m - This has one significant figure. The leading zeros are not counted as significant figures.

B) 510 m - This has three significant figures, but all are whole numbers.

C) 0.510 m - This has three significant figures. The zero after the decimal point is counted as a significant figure because it is between two non-zero digits.

D) 0.051 m - This has two significant figures. The leading zeros are not counted as significant figures.

E) 5100 m - This has two significant figures. The trailing zero is not counted as a significant figure because there is no decimal point.