A guitar string 66 cm long vibrates with a standing wave that has two antinodes.
1.Which harmonic is this
2.what is the wavelength

This is in the 2nd harmonic

The wavelength of the harmonic is λ=66

Explanation:

Given data

length= 66cm  antinodes= 2

1.To find the harmonic

We have the formula,

No of antinodes= No of harmonic

2=2

This is in the 2nd harmonic

2.The wavelength of the harmonic

We have the formula,

λ=2L/n=2 66/2

λ=66

The wavelength of the harmonic is λ=66

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

hope this ! : )

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s