The tension in a guitar string is decreased by 36%. Compared to the string oscillating in its 1st harmonic before, the new 1st harmonic frequency , and the 1st harmonic wavelength .

The roller coaster from problem #1 then tops a second hill at 15.0 m/s, how high is the second hill? 91.5 m 79.2 m 80.0 m 68.5 m

By what factor does the drag force on a car increase as it goes from 65 to 110 km/h?

Suppose that three astronomical objects, 1, 2, and 3 are observed to lie on a line, and the distance from object 1 to object 3 is d. object 1 has four times the mass of object 3, and seven times the mass of object 2. find the distance between objects 1 and 2 for which the net force on object 2 is zero.