Haylie wanted to see if the type of paper changed how far a paper airplane flew. She made two paper airplanes, one with construction paper and one with lined notebook paper. What scientific tool would she need to conduct her experiment? (btw this is science, I just cant find science)

Determine the time it takes for a satellite to orbit the earth in a circular "near-earth" orbit. the definition of "near-earth" orbit is one which is at a height above the surface of the earth which is small compared to the radius of the earth, so that you may take the acceleration due to gravity as essentially the same as that on the surface. does your result depend on the mass of the satellite?