15. What is the solar altitude on the 4th of July in Washington, D.C., at latitude 39"N? a.22.7 b.73.7 c.23.5 d.51° e.90° 16. Th
rough the whole year, the sun's declination migrates through a total of a. 23.5° b.30° с.470 d.66.5° e. 133
1 answer:
Answer:
answer 15 correct option is b. 73.7°
answer 16 correct option is с. 47°
Explanation:
we know that on 4th july Northen hemisphere have summer and Washington, D.C also in Northen hemisphere
and sun present at 23.5° latitude
so latitude of sun is calculate as given figure below
= 90° - ( 39° - 23.5° )
= 74.5°
so correct option is b.73.7
this difference if because we take latitude 23.5° that is approx on 24 july
but july 4 latitude will be some low
and
we know during summer declination angle is + 23.5 in N.H.
and during winder declination angle is - 23.5 in N.H.
and at spring and autumn sun is at equator
the declination angle change is
declination angle change = 27.5 + 27.5 = 47°
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The distance of the satellite form the earth is:
9,608,000 m (Option C) in Standard form, this is written as 9.6 x 10.
An Orbiting Satellite is a satellite that goes around the earth in an elliptical path known as an orbit.
To calculate the distance of the satellite from the earth we must equalize the force of Gravity to Centripetal Force given that these are the two forces that are at play here.
Step 1:
Equation that equalizes Gravity to Centripetality is:
G = mM/r² = m(v²/r)
Note that G = 6.67 x 10 (This is a gravitational constant.)
m is the Mass of the Satellite
M is Mass of the Earth
r is the distance of the satellite from the center of the earth
v is the satellites tangential velocity
Step 2 - Rearrange the formula and substitute the numbers above to get r
r = G (m/v²) = (6.67 x 10) (6 x10
/5000²) =
= 1.6 x 10m
Recall that form our postulation above, this is the satellites distance form the center of the earth.
To get it's distance form the earth's surface, we must know remove the value of the radius of the earth from the calculation. Where radius of the earth is given a r'
Hence,
r' = r - R = 1.6 x 10m - 6.4 x 10
m
= 9.6 x m or 9,608,000 m
Learn more about orbiting satellites at: