Which of the following is NOT a source of energy used by living things?
2 answers:
Answer:
<u>Option-(D):</u> Wind energy.
Explanation:
<u> Wind energy:</u>
The wind energy is a form of solar energy which is used to transmit the amount of energy present in the molecules of the solar rays which originates from the Sun surface moving towards the planet earth. As these molecules are carried in air from one point inside the earth's atmosphere in form of air.
As, there are different machinery and advanced form of structures being made to catch these molecules, and then turn them into the mechanical energy, and at last the electrical form of energy is obtained as a result.
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We have the equation of motion , where s is the displacement, a is the acceleration, u is the initial velocity and t is the time taken.
Here s = 300 m, u = 0 m/s, a = 9.81
Substituting
Now we have v = u+at, where v is the final velocity
Here u = 0 m/s, a= 9.81 and t = 7.82 seconds
Substituting
v = 0+9.8*7.82 = 76.68 m/s
The speed with which the penny strikes the ground = 76.68 m/s.