A wave has a frequency of 540 Hz and is traveling at 340 m/s. What is its wavelength?
1 answer:
Answer:
wavelength of wave = 62.69 cm
Explanation:
Given
frequency of wave = 540 Hz = 540
Speed of wave = 340 m
wavelength of wave = ?
We know that for all waves, the relationship between wavelength λ, frequency f and speed v is same and given by the equation:
v = fλ
Hence wavelength λ = v/f
= 340 m / 540
= 0.6296 m
= 62.69 cm
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Answer:
w = 0.189 rad/ s
Explanation:
This exercise we work with the conservation of the moment, the system is made up of the merry-go-round and the child, for which we write the moment of two instants
Initial
L₀ = I₀ w₀
Final
= I w
L₀ = L_{f}
I₀ w₀ = I_{f} w
.w = I₀/I_{f} w₀
The initial moment of inertia is
I₀ = 500 kg. m2
The final moment of inertia
= 500 + m r²
I_{f} = 500 + 20 1.5
I_{f} = 530 kg m²
Initial angular velocity
w₀ = 0.20 rad / s
Let's calculate
w = 500/530 0.20
w = 0.189 rad / s