The vertical displacement of a string is given by y(x,t) = (6.00 ...

[nevelica]

The vertical displacement of a string is given by y(x,t) = (6.00 mm) cos(3.25 m-1)x - (7.22 s-1)t. What is the amplitude of the wave?
 
  A)
 
  6.00 mm
  B)
 
  12.0 mm
  C)
 
  3.00 mm
  D)
 
  2.00 mm
  E)
 
  None of the other choices is correct.

Question 2

Because Earth's orbit is slightly elliptical, Earth actually gets closer to the Sun during part of the year. When Earth is closer to the Sun its orbital speed is
 
  A)
 
  less than when Earth is farthest away from the Sun.
  B)
 
  the same as when Earth is farthest away from the Sun.
  C)
 
  greater than when Earth is farthest away from the Sun.
  D)
 
  sometimes greater sometimes smaller than when Earth is farthest away from the Sun.

[Briannahope]

Answer to Question 1

A

Answer to Question 2

C

[nevelica]

TYSM

[ebonylittles]

Thanks for the timely response, appreciate it