Asked by NH

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.
Answered by drwls
You are right.
Answered by Angela
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.
Answered by NH
Thanks, drwls!
Answered by drwls
Angela's question has been answered in a separate "string":
http://www.jiskha.com/display.cgi?id=1242403375.
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