A wave has an amplitude of .25m, a wavelength of .68m and a frequency of 3.2 hz. Find it's velocity? To solve I just used v=3.2 * .68=2.176m/s because amplitude doesn't factor into velocity. Is this right?thanks.

You are right.

A force of 40 N is applied at an angle of 30oabove the horizon to a 5 kg block that is at rest on a rough horizontal surface. After the block starts to move with an acceleration of 3 m/s2, what is the coefficient of kinetic friction between the block and the horizontal surface?

How you solve a friction question without knowing the coefficient and vice versa? Please help.

Thanks, drwls!

Angela's question has been answered in a separate "string":

http://www.jiskha.com/display.cgi?id=1242403375.

To find the velocity of a wave, you need to use the equation v = λ * f, where v represents velocity, λ represents wavelength, and f represents frequency.

In your case, the given wavelength is 0.68m and the frequency is 3.2 Hz.

Using the formula, v = 0.68 * 3.2, you correctly calculated the velocity as 2.176 m/s.

However, it's important to note that frequency and wavelength are directly related to each other, and the product of frequency and wavelength gives you the velocity of the wave, as shown by the equation v = λ * f.

The amplitude of the wave, on the other hand, represents the maximum displacement of the wave from its equilibrium position, but it does not affect the velocity of the wave. Therefore, your calculation is correct. The amplitude does not need to be considered when finding the velocity of the wave in this case.