What is the main cause of twice-daily tides around the world? Help me.

Physics

1 answer:

liraira [26]3 years ago

4 0

The main cause of twice-daily tides around the world are;

Gravitational pull of the moon

Tides are the rise and fall of water caused by gravitational forces of the moon and sun on the oceans of the earth.

The moons gravity is large enough to actually pull water out of the ocean from space. Just enough to create motion of the tides.

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3 years ago

The diagram shows waves of sound travelling through the air. By which factor is the sound intensity decreased at 3 meters?

SIZIF [17.4K]

The diagram is missing; however, we know that the intensity of a sound wave is inversely proportional to the square of the distance from the source:
$I(r)= \frac{1}{r^2}$
where I is the intensity and r is the distance from the source.

We can assume for instance that the initial distance from the source is r=1 m, so that we put
$I= \frac{1}{r^2}= \frac{1}{(1)^2}=1$
The intensity at r=3 m will be
$I= \frac{1}{r^2}= \frac{1}{(3)^2}= \frac{1}{9}$
Therefore, the sound intensity has decreased by a factor $1/9$ .