That's called a "geostationary" orbit. (Not "geosynchronous".)
It's the situation when the satellite's orbit is
-- perfectly circular,
-- exactly over the equator,
-- and at exactly the right distance from the center of the Earth
(<span>42,164 km or 26,199 mi).</span>
None of these conditions can ever be perfect, and in fact they change over time.
So every real geostationary satellite actually describes a little figure-8 in the sky
once a day. The better its orbit is, the smaller the figure-8.
In order to keep the orbit reasonably correct, it needs a puff from its onboard
thrusters every once in a while.
That's how a TV or weather satellite reaches its "end of life", if it doesn't get
smashed by a meteoroid first: Either its solar panels get too dusty and chipped
by micrometeoroids to generate enough power, or else it runs so low on fuel for
its onboard thrusters that it can't be kept in a useful orbit. At that point, the fuel
that remains is used to intentionally put it into a crazy orbit, where it will dip low
into the atmosphere and burn up.
Why destroy it ? To get it out of the geostationary orbital track, and open up one
of those precious slots for a new, young satellite to take its place. There are only
a few hundred slots available where a satellite can be geostationary. (And a slot
over the Indian Ocean doesn't do TV viewers in the US much good.)
Answer:
The Bulk density = 1.3 g/cm³
the porosity of the sample is 132 cm³
Explanation:
Given:
Volume of cylinder = 260 cm³
Mass of container and the soil = 403 g
Mass of the empty container = 65 g
Thus,
The mass of the soil is = 403 - 65 = 338 g
Now,
The Bulk density = 
or
The Bulk density = 
or
The Bulk density = 1.3 g/cm³
also,
average particle density for mineral soil is usually given as 2.65 g/cm³
i.e the air present in the given soil sample has reduced its density from 2.65 g/cm³ to 1.3 g/cm³
The mass of the whole sample = Volume × Density
= 260 × 2.65
= 689 gm
but,
The actual mass of the dry sample = 338 g
thus,
Mass of air in the sample = 689 - 338 = 351 g
Therefore,
the volume of 351 g soil = 
= 
= 132.45 cm³
so the porosity of the sample is 132 cm³
To maintain the same commuting vessal
The correct answer is c. More total rainfall from a slower moving storm.
When the the forward speed of the hurricanes and tropical storms slows down they tend to increase the rainfall. Because of the slow movement the storm can be for few days over a given region and produce rainfall without stopping, thus create major flooding, pilling up of the coastal water, and produce persistent strong winds even though they have decreased in their forward speed.
<span>It is important to protect our shores for environmental reasons. Just past the shores are grasses that provide habitat for birds and other animals. The shoreline is part of the ecosystem and disrupting vegetation throws the environment out of balance. In addition, the shoreline needs to be preserved to sustain economic vitality. Homes and businesses are often just past the shoreline. Without protection, an eroded shoreline will lower property values.</span>
