Oilbirds are nocturnal birds. As they fly, they produce a high-pitched clicking sound to locate obstacles using a pulse-echo technique.
(a) Describe how the oilbirds use the pulse-echo technique to locate obstacles. Answered.
(b) The frequency of sound in an oilbird's click is 2.0 kHz and a click is 2.0 ms in duration.
Determine whether these clicks can be used to locate obstacles at a distance of 50 cm.
speed of sound = 330 m s-1
?​

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

= initial pressure

= final pressure = 2

= initial volume

= final volume = /4

= initial temperature = 20 c = 20 + 273 = 293 k

= final temperature = ?

using the equation