Q1. Planet Zero has a mass of 5.0 ´ 1023 kg and a radius of 2.0 ´ 106 m. A space probe is launched perpendicularly from the surface of Zero with an initial speed of 4.0 km/s. What is the speed of the probe when it is 3.0 ´ 106 m from Zero's center?
Q2. A guitar string is 90cm long and has a mass of 3.6g from the bridge to support post (L) is 60cm and the string is under the tension of 560. What are the frequencies of fundamental and first two overtones?