Answer:
<h2>The answer is 9 kg</h2>
Explanation:
The mass of an object can be found by using the formula

f is the force
a is the acceleration
From the question we have

We have the final answer as
<h3>9 kg</h3>
Hope this helps you
I haven´t learned that yet I´m sorry.

. Your net force will be the crate's weight multiplied 2. and force in the x-direction will be 500N. You can then solve the equation for the friction force.
Correct your answer is perfect.
Answer
given,
frequency = 600 Hz
speed of sound = 343 m/s
wavelength =


λ = 0.572 m
for destructive interference
path difference = 
path difference = 
path difference = 0.286 m
b)
path difference will be equal to 0.286 m
the sound distance from the λ/2 from the first speaker will be out of phase with the sound at that first speaker.
Since the second speaker is described as being out of phase with the first, placing them λ/2 apart will make their sound constructively interfere.