I'll give for fast answers A gravity wave produced by two orbiting neutrons stars travels at the speed of light, c = 300,000 km/sec. If the period of the orbital motion is 10 seconds, what is the distance between crests of the gravity wave?

The experiment done in lab is repeated, using a ball that has unknown mass m. you plot your data in the form of f 2 versus m/l, with f in rev/s, m in kg, and l in m. your data falls close to a straight line that has slope 3.19 m/(kg · s2). use g = 9.80 m/s2 and calculate the mass m of the ball.