Answer:
about 14.7°
Explanation:
The formula for the angle of the first minimum is ...
sin(θ) = λ/a
where θ is the angle relative to the door centerline, λ is the wavelength of the sound, and "a" is the width of the door.
The wavelength of the sound is the speed of sound divided by the frequency:
λ = (340 m/s)/(1300 Hz) ≈ 0.261538 m
Then the angle of interest is ...
θ = arcsin(0.261538/1.03) ≈ 14.7°
At an angle of about 14.7°, someone outside the room will hear no sound.
The answer is b the switch causes a break I'm the circut
Answer:
I know one way of refraction in this photo is how you can see a mirror like image of the man while he is under water on the waves on the surface
Explanation:
I hope that this helps
Answer:
n order to walk across the floor, you push backwards on the floor with your foot. Newton's Third Law says that the reaction force to this action force is "floor pushes you forward" (Action: You push floor backwards. Reaction: floor pushes you forward.) So, when you walk, it is the floor that pushes you along!
Explanation:
Answer:
The amount of effort needed to move the box is 187.5 N
Explanation:
weight of the box = load moved by the ramp, L = 750 N
mechanical advantage of the ramp, MA = 4
effort needed to move the box, E = ?
Mechanical advantage is given as = Load / Effort
Effort = Load / Mechanical advantage
Effort = 750 / 4
Effort = 187.5 N
Therefore, the amount of effort needed to move the box on to the truck using a ramp is 187.5 N