The average power produced by the soccer player is 710 Watts.
Given the data in the question;
- Mass of the soccer player;
- Energy used by the soccer player;
- Time;
Power;
Power is simply the amount of energy converted or transferred per unit time. It is expressed as:
We substitute our given values into the equation
Therefore, the average power produced by the soccer player is 710 Watts.
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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
The given statement "An astronaut's mass is the same on the International Space Station as it is on Earth" is true.
Answer: Option D
<u>Explanation:</u>
There is usually a slight difference between mass and the weight of an object. The difference is that the mass of any object is independent of its acceleration due to gravity or gravitational influence of the planet where it is present.
Similarly, the weight of any object will be influenced by the gravitational force of that planet as the weight is directly proportional to the acceleration due to gravity of that planet.
So, the other three options are false and those three options states that weight of an object on Earth is equal to the weight of that object on any other planet. This is not true. So, the fourth option related to the mass of an astronaut in and outside Earth is true as it is equal theoretically.