MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

There are no items in this cart.
Continue Shopping
Menu
Simran Bhatia Grade: 11
        A travelling wave is produced on a long horizontal string by vibrating an end up and down sinusoidally. The amplitude of vibration is 1.0 cm and the displacement becomes zero 200 times per second. The linear mass density of the string is 0.10 kg m-1 and it is kept under a tension of 90 N. (a) Find the speed and the wavelength of the wave. (b) Assume that the wave moves in the positive x-direction and at t = 0, the end x = 0 is at its positive extreme position. Write the wave equations. (c) Find the velocity and acceleration of the particle at x = 50 cm at time t = 10 ms.
3 years ago

Answers : (1)

Jitender Pal
askIITians Faculty
365 Points
										Sol. Amplitude, A = 1 cm, Tension T = 90 N

Frequency, f = 200/2 = 100 Hz
Mass per unit length, m = 0.1 kg/mt
a) ⇒ V = √T /m = 30 m/s
λ = V/f = 30/100 = 0.3 m = 30 cm
b) The wave equation y = (1 cm) cos 2π (t/0.01 s) – (x/30 cm)
[because at x = 0, displacement is maximum]
c) y = 1 cos 2π(x/30 – t/0.01)
⇒ v = dy/dt = (1/0.01)2π sin 2π {(x/30) – (t/0.01)}
a = dv/dt = – {4π2 / (0.01)2} cos 2π {(x/30) – (t/0.01)}
When, x = 50 cm, t = 10 ms = 10 * 10–3 s
x = (2π / 0.01) sin 2π {(5/3) – (0.01/0.01)}
= (p/0.01) sin (2π * 2 / 3) = (1/0.01) sin (4π/3) = –200 π sin (π/3) = –200 πx (√ 3 / 2)
= 544 cm/s = 5.4 m/s
Similarly
a = {4π2 / (0.01)2} cos 2π {(5/3) – 1}
= 4π2 * 104 * ½ ⇒ 2 * 105 cm/s2 ⇒ 2 km/s2
3 years ago
Think You Can Provide A Better Answer ?
Answer & Earn Cool Goodies
  • Complete Physics Course - Class 12
  • OFFERED PRICE: Rs. 2,756
  • View Details
Get extra Rs. 413 off
USE CODE: COUPON10
  • Complete Physics Course - Class 11
  • OFFERED PRICE: Rs. 2,968
  • View Details
Get extra Rs. 445 off
USE CODE: COUPON10

Ask Experts

Have any Question? Ask Experts

Post Question

 
 
Answer ‘n’ Earn
Attractive Gift
Vouchers
To Win!!! Click Here for details