The period of a wave is 20 ms (milliseconds) and its wavelength is 4 cm. Calculate: a) The frequency of the wave

b) The velocity of the wave​

What property is a characteristic of a substance that can be observed and does not change the identity of the substance

In which of the following cases is work being done on an object? question 2 options: pulling a trailer up a hill carrying a box down a corridor suspending a heavy weight with a strong chain pushing against a locked door

A1-lb collar is attached to a spring and slides without friction along a circular rod in a vertical plane. the spring has an undeformed length of 5 in. and a constant k =25 lb/ft. knowing that the collar is released from being held at a determine, the speed of the collar and the normal force between the collar and the rod as the collar passes through b.