Answer:
When the sound wave enters the water its wavelength increase.
Explanation:
Given:
Speed of sound in air 
Speed of sound in fresh water 
We know that when wave travel into one medium to another medium frequency doesn't change.
Velocity is given by,
In above equation frequency is constant,
So when sound wave enters the water wavelength increase because speed sound is increase in water as compare to air.
Therefore, when the sound wave enters the water its wavelength increase.
The question is oversimplified, and pretty sloppy.
Relative to the Earth . . .
The Moon is in an elliptical orbit around us, with a period of
27.32... days, and with the Earth at one focus of the ellipse.
Relative to the Sun . . .
The Moon is in an elliptical orbit around the Sun, with a period
of 365.24... days, and with the Sun at one focus of the ellipse,
and the Moon itself makes little dimples or squiggles in its orbit
on account of the gravitational influence of the nearby Earth.
I'm sorry if that seems complicated. You know that motion is
always relative to something, and the solar system is not simple.
Answer:
a).11.546J
b).2.957kW
Explanation:
Using Inertia and tangential velocity
a).
Now using Inertia an w
average power=
b).
power=t*w
P=
P=2.957 kW
To act as the Sun' was accepted but if you put 'sunlight' alone it was not accepted. The examiner wanted you to state that the infra red radiation was needed to warm up the water.
