0

HETAV PATEL

Grade 11,

Courses New

Two identical waves (except for direction of travel) oscillate through a springs and yield a superposition according to the equation y’ = (0.50 cm) sin What are the amplitude and speed of the two waves? What is the distance between nodes? What is the transverse speed of a particle of the string at the positon x = 1.5 cm when t =9/8 s?

Two identical waves (except for direction of travel) oscillate through a springs and yield a superposition according to the equation
 y’ = (0.50 cm) sin
  1. What are the amplitude and speed of the two waves?
  2. What is the distance between nodes?
  3. What is the transverse speed of a particle of the string at the positon x = 1.5 cm when t =9/8 s?

Grade:12th pass

1 Answers

Arun
25750 Points
6 years ago
Dear student
Yes, you do have to take the derivative of this. This is a partial differential equation because y' = (0.005 cm) sin[(π/3)x] cos[(45π)t] is a function of x and t. We need the speed, so that equation represents displacement along the y direction. Take dy'/dt, treating terms with x as constants. 
First I'm going to convert the cm to m. 
y' = (0.005) sin[(100π)/3)x] * cos[(45π)t] 
Now derive using product rule and chain rule. 
dy'/dt = 0.005 * sin[(100π)/3)x] * [-sin((45π)t)] * (45π) 
= -0.225π * sin[(100π)/3)x] * sin[(45π)t] 
Subbing in x = 0.015m and t = 9/8s gives v = -0.65m/s = -65cm/s. 
You can check that this works by subbing the the values of x where there are nodes, and your speed should equal 0.
Regards
Arun (askIITians forum expert)

Think You Can Provide A Better Answer ?

Other Related Questions on Wave Motion

View all Questions »

ASK QUESTION

Get your questions answered by the expert for free

Answer and earn gift vouchers

Win Gift vouchers upto Rs 500/-

View courses by askIITians

Design classes One-on-One in your own way with Top IITians/Medical Professionals

Click Here Know More

Complete Self Study Package designed by Industry Leading Experts

Click Here Know More

Live 1-1 coding classes to unleash the Creator in your Child

Click Here Know More

a Complete All-in-One Study package Fully Loaded inside a Tablet!

Click Here Know More