Answer:
v = 7.67 m/s
Explanation:
Given data:
horizontal distance 11.98 m
Acceleration due to gravity 9.8 m/s^2
Assuming initial velocity is zero
we know that
solving for t
we have
substituing all value for time t
t = 1.56 s
we know that speed is given as
v = 7.67 m/s
Answer:
I think the answer is b but i cannot confirm cuz this is a challenging question
The beat frequency (4 beat per second = 4 Hz ) corresponds to the difference between the frequencies of the two waves:
(1)
The frequency of the first wave can be written as
where v is the speed of sound in the gas and
is the wavelength of the first wave, while the frequency of the second wave is
where
is the wavelength of the second wave. If we substitute into the first equation (1), we find
and if we re-arrange it, we can find the velocity of the sound in the gas: