Find the frequencies of the first three harmonics of a 1.0-m long string which has a mass per unit length of 2.0  10–3 kg/m and a tension of 80 n when both ends are fixed in place.

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination. at the turning point, how far is the second student from the destination?