Increasing the tension of a spring affects a wave on the spring because it increases the frequency. When the tension rises, so does the frequency.
Explanation:
If g= 10m/s²
Then 75kg=75×10=750N
Since Work =Force ×Distance
Work=750×30
=22500J
And Power°=Work÷time
=22500÷120
=187.5W
We know

How he find:-
The owner will measure speed of light through the index(Diamond or rutile).Then using calculations he fill find which is the velocity of diamond or rutile
<h3> For diamond</h3>





<h3>For rutile</h3>





To solve this problem we will apply the concepts related to the conservation of the Momentum. For this purpose we will define the momentum as the product between mass and velocity, and by conservation the initial momentum will be equal to the final momentum. Mathematically this is,

Here,
= Mass of Dan and Skateboard respectively
= Initial velocity of Dan and Skateboard respectively
= Final velocity of Dan and Skateboard respectively
Our values are:
Dan's mass

Mass of the skateboard

Both have the same initial velocity, then

Final velocity of Skateboard is

Rearranging to find the final velocity of Dan we have then,



Replacing,


Therefore Dan will touch the ground at a speed of 3.76m/s
Subtract the total mass of the tank and water by the mass of the empty tank. That will yield the mass of the water.
51.8 - 3.64 = 48.16.
Your answer is 48.16 kg