The student observed a different sidewalk that was in the shade. Several hours after the storm ended, this sidewalk was still wet.
Explain why water was still on the sidewalk that was in the shade.

Aradio signal from a gps satellite take only about 0.067 seconds to reach a gps reciever. if the speed of light is about 300,000km/s, then approximately how far away is the reciever from from the satellite?

What is the percentage of hydrogen in nitrogen trihydride

Which of the following has wavelength longer than the wavelength of viable light? a) x rays b) gamma rays c) radios waves d) ultraviolet waves