Answer:
The dolphins average speed is 3.51 
Explanation:
First of all, the following rules of three should be applied:
- If 1 mile is equal to 1609 meters, 20 miles are equal to how many meters?

distance=32,180 meters
- If 1 minute is equal to 60 seconds, 153 minutes is equal to how many seconds?

time= 9,180 seconds
Speed is a physical quantity that expresses the relationship between the space traveled by an object and the time used for it. That is, speed implies the change of position of an object in space within a certain amount of time and is calculated as:

So in this case the velocity is calculated as:

Solving, you get:
Speed= 3.51 
<u><em>The dolphins average speed is 3.51 </em></u>
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Answer:
Explanation:
One CH4 molecules = 10 electrons ( Carbon 6e + 4Hydrogen 4e)
A mole of any substance witll have = 6.023*10^23 atom/ molecuels,
One mole of any substnce is equal is nothing but its moalr mass
Molar mass of CH4 = 16.04
It mean,
16.04 g of CH4 has = 6.023*10^23 molecules of methane
but
4.2 gram of CH4 = 6.023*10^23 * 4.2 /16.04 = 1.58*10^23 molecuels of CH4
So one molecule has =10 electrons
1.58*10^23 molecuels will have = 1.58*10^23 * 10 = 1.58*10^24
Hope this help you
Answer:
127.013 C
Explanation:
-We apply Faraday's First Law of Electrolysis which states that the mass,m of a substance deposited is directly proportional to the current,Q passed through it:

Where Z is the proportionality constant(g/C)
-The current can therefore be calculated as:

Hence, the amount of current through the circuit is 127.013 C
The person on top is very correct have a beautiful lovely day:)