What is the wavelength of an earthquake wave if it has a speed of 7km/s and a frequency of 8hz

A10.0 kg cart and a 15kg cart are locked together with a compressed spring between them. they are then released so that the spring pushes the two carts apart. the 10.0 kg cart is moving at 4.5 m/s afterward. how fast is the 15kg cart moving? 3.0 m/s 2.0 m/s 4.5 m/s 5.0 m/s

Frequency of electromagnetic waves that a radio station is assigned is called

Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?