A sound wave with a frequency of 100Hz travels in water with a speed of 1,500 m/s and then travels in air with a speed of 340m/s. Approximately how many time larger is the wavelength in water than in air?

What is the angular momentum of the bar about the axle?

The man of mass m1 and the woman of mass m2 are standing on opposite ends of the platform of mass m0 which moves with negligible friction and is initially at rest with s = 0. the man and woman begin to approach each other. derive an expression for the displacement s of the platform when the two meet in terms of the displacement x1 of the man relative to the platform.

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled? a. the field does not change b. the field strength decreases by half. c. the field strength doubles d. the field strength quadruples