Why would it not be sensible to record distance measurement as 55.125 +- 0.1 m? What would be a more appropriate way to write this distance measurement

The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?

How is coal extracted from mountaintop removal mines? a. dynamite is used to create underground tunnels where miners go to extract the coal. b. dynamite is used to break apart rocks and then draglines are used to remove the broken rock and reach the coal. c. coal in mountaintops is extracted by digging strips in the landscape to reach the coal. d. placer deposits in mountain river bottoms are removed by

Which of the following is the phase that results when the moon is on the opposite side of the earth from the sun? a. quarter moon b. crescent moon c. new moon d. full moon