<span>It is important to use the Système Internationale (SI) units to describe motion, and other scientific concepts, firstly because the units are the most widely used. Unit choice is largely arbitrary, however, because many scientific units are derived from the base SI units, for example, the Newton is kg m s-2. Thus, secondly, more complex units are based on the bedrock of the SI units.</span>
Answer:
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Explanation:
cant help you if there is no question.
Answer:
1.) Check the explanation for the answer
2.) 10 MJ
Explanation:
Given that a coal power plant station generates electricity at night when it is not needed. Some of this energy is stored by pumping water up to a mountain lake. When there is high demand for electricity, the water is allowed to flow back through a turbine to generate electricity.1- Write down the forms of initial and final energy transfer.
Solution.
The initial conversion will be :
Chemical energy is converted to mechanical energy.
The final conversion will be :
Mechanical energy is converted to electrical energy. While the electrical energy is converted to light energy.
2- On one occasion, 2000 kg of water is pumped up through a vertical height of 500 m. Calculate the gravitational potential energy. (g= 10 m/s^2)
The gravitational potential energy can be calculated by using the formula
Energy = mgh.
Where
M = mass
H = height
g = acceleration due to gravity
Substitute all the parameters into the formula
Potential Energy = 2000 × 500 × 10
Potential energy = 10000000 Joule
Potential energy = 10 MJ
Positive acceleration is a parabola pointing upwards.
Negative acceleration is a parabola pointing downwards.
I am not sure what you mean by the balanced forces. But I guess it means no acceleration which is a straight line. It can be a horizontal line or an inclined line.
The next time the string will have the same appearance that it did at t=0s is 2.29 s.
<h3>
Frequency of the wave</h3>
v = fλ
f = v/λ
where;
half of the upward pulse is a quarter of wavelength = ¹/₄ x 4 m = 1 m
f = 3.5/1
f = 3.5 Hz
<h3>Time of motion when the pulse is at 4 m</h3>
t1 = 4/3.5 = 1.143 s
The next time the string will have the same appearance that it did at t=0s.
d = 4 m x 2 = 8 m
t2 = 8/3.5
t2 = 2.29 s
Thus, the next time the string will have the same appearance that it did at t=0s is 2.29 s.
Learn more about time of motion here: brainly.com/question/2364404
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