At a given instant, the geocentric equatorial position vector of an earth satellite is r1 ¼ 3600^i þ 4600^j þ 3600^k ðkmþ thirty minutes later, the position is r2 ¼ 5500^i þ 6240^j 5200^k ðkmþ find the specific energy of the orbit.

Ten students stand in a circle and are told to make a transverse wave. what best describes the motion of the students? each student bumps the shoulder of his or her neighbor. at the exact time, all students take a step to the right. the students skip clockwise, going in a circular motion. one at a time, each student lifts his or her hands up and then down.

Which of the following is not a transverse wave? a) soundb) lightc) radiod) all of thesee) none of these

What is the role of the water cycle in maintaining freshwater levels in lake and rivers?