Answer to Question #281802 in Mechanical Engineering for eyad allaban

Question

Given the wavefunction of a standing wave: y(x,t) = A sin(πx)cos(2πt), where x and y are in meters and

t is in seconds. The position of the second anti-node from the end x = 0 is at:

Answer 1

Given:

$y(x,t) = A \sin(πx)\cos(2πt)$

The positions of anti-nodes are given by the equation 

$\sin(\pi x)=\pm 1$

So 

$\pi x=\pi/2+\pi n, \quad n=0,1,2,...\\ x=1/2+n$

The position of second anti-node from origin

$x=1/2+1=3/2\:\rm m=1.5\: m$