Question

A wave on a string can be described by the following equation: y(x,t)=9.2cos(4.2x+0.85t) where y and x are in meters and t is in seconds.

1)

What is the speed of the wave?

0.79 m/s

1.27 m/s

0.2 m/s

4.94 m/s

0.03 m/s

2)

What is its wavelength?

0.2 m

0.67 m

7.39 m

5.34 m

1.5 m

3)

What is the acceleration of the string in the y direction at x=1.7 m and t=7 seconds?

3.91 m/s2

7.97 m/s2

-5.76 m/s2

-6.65 m/s2

5.76 m/s2

4)

Which direction is the wave traveling?

Right (positive x direction)

Perpendicular to x

Left (negative x direction)

Answer 1