A) A small source emits sound waves with a power output of 180 W.
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Answer:
The energy which is expend by the person is .
Explanation:
The formula for the potential energy due to the height of the object is as follows as;
U= mgh
Here, h is the height of the person, m is the mass of the object and g is the acceleration due to gravity.
It is given in the problem that a person is 8850 m above the sea level. 78 kg climber would expend energy against the gravitational force in climbing to the summit from sea level. Here, the person has potential energy as he is above the sea level.
Put h= 8850 m, m= 78 kg and and in the above expression to get the value of energy.
U= (78)(9.8)(8850)
U= 6764940 J
Therefore, the energy which is expend by the person is .