Divide the distance by the speed:
(18 m) / (42 m/s) = 3/7 s ≈ 0.43 s
The reason behind the barking of the group of neighborhood dogs could be <u>Territorial/Protective</u> or <u>Alarm/Fear</u>.
What is bark or barking?
Dogs are known for making the most prevalent barking noises. Wolves, coyotes, foxes, seals, and barking owls are a few other creatures that make this sounds. The most typical onomatopoeia for this sound in English, particularly for large dogs, is "woof." The word "bark" can also be used to describe the sound made by numerous canids. A bark is a brief vocalization, as per the researchers at the University of Massachusetts Amherst.
Territorial/Protective: When a person or another animal enters their perceived area, your dog may bark excessively, depending on the breed. The barking frequently gets louder as the threat draws closer. When your dog barks in this manner, he will appear vigilant and sometimes even hostile.
Alarm/Fear: Some dogs will bark in alarm or fear at any sound or item that draws their attention or alarmed them. It's not just in their home country where this can occur. When they are afraid, their tails will be tucked and their ears will be pulled back.
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The total momentum of the system is equal to 50 Kgm/s.
<u>Given the following data:</u>
To determine the total momentum of the system:
Mathematically, momentum is given by the formula;

<u>For Football player 1:</u>

Momentum 1 = 160 Kgm/s.
<u>For Football player 2:</u>

Momentum 1 = 210 Kgm/s.
Now, we can calculate the total momentum of the system:

Total momentum = 50 Kgm/s.
<u>Note:</u> We subtracted because the football players were moving in opposite directions.
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The speed of sound in gases is represented mathematically as:
v(sound) = √γRT/M
where γ = adiabatic constant which is the ratio of the heat capacities at constant pressure and constant volume; Cp/Cv
R = gas constant
T = temperature
M = molar mass of the gas
Hence, the speed of sound in gas is directly proportional to the square root of temperature.
Ans: c) temperature
I think you can weigh it 3 and 3.
If they balance, choose set not used.
If not balanced, take the heavier side
then weigh 1 and 1
if balanced, stone not used, if not balanced, take the heavier side
hope this helps