Physics

Problem

A transverse wave described by an equation

y = 0.02 \sin (x + 30t)

, where

x

and

t

are in metre and second, is travelling along a wire of area of cross-section

1 \text{ mm}^2

and density

8000 \text{ kgm}^{-3}

. What is the tension in the string? a. 20 N b. 7.2 N c. 30 N d. 14.4 N