The value of a , b , c , e and the coordinates of the center of the Sun if the center of the hyperbolic orbit is (0,0) and the Sun lies on the positive x axis.
It has been determined that a=1440 , b=600 , c=1560 and e≈1.083 .
It has also been determined that the coordinates of the center of the Sun are (1560,0) .
Given:
A comet following a hyperbolic path about the Sun has a perihelion of 120 Gm. When the line from the comet to the Sun is perpendicular to the focal axis of the orbit, the comet is 250 Gm from the Sun.
Concept used:
The perihelion distance of a hyperbola is c−a .
Calculation:
It is given that a comet follows a hyperbolic path about the Sun such that the center of the hyperbolic orbit is (0,0) and the Sun lies on the positive x axis.
Then, the equation of the hyperbola is given as x2a2−y2b2=1 .
As discussed, the perihelion distance of a hyperbola is c−a .
It is given that the comet following a hyperbolic path about the Sun has a perihelion of 120 Gm.
Then, c−a=120 .
Now, for a hyperbola, c2=a2+b2 .
Put x=c in x2a2−y2b2=1 to get,
c2a2−y2b2=1y2b2=c2a2−1y2=b2(c2a2−1)
Put c2=a2+b2 in y2=b2(c2a2−1) to get,
y2=b2(a2+b2a2−1)=b2(1+b2a2−1)=b2(b2a2)=b4a2
So, y=±b2a .
It is given that when the line from the comet to the Sun is perpendicular to the focal axis of the orbit, the comet is 250 Gm from the Sun.
This implies that b2a=250 .
Simplifying,
b2=250a
Put b2=250a in c2=a2+b2 to get,
c2=a2+250a
Simplifying,
c2−a2=250a
On further simplification,
(c−a)(c+a)=250a
Put c−a=120 in the above equation to get,
120(c+a)=250a
Simplifying,
120c+120a=250a
On further simplification,
120c=130a
Now, c−a=120 . Then, c=120+a .
Put c=120+a in 120c=130a to get,
120(120+a)=130a14400+120a=130a10a=14400a=1440
So, a=1440 .
Put a=1440 in b2=250a to get,
b2=250(1440)
Simplifying,
b=±600
Taking the positive value, b=600 .
Put a=1440 in c=120+a to get,
c=1560
Put c=1560 and a=1440 in e=ca to get,
e=15601440
Simplifying,
e≈1.083
Now, the Sun is at the focus, which is the point (c,0) .
Then, the coordinates of the center of the Sun are (1560,0) .
Conclusion:
It has been determined that a=1440 , b=600 , c=1560 and e≈1.083 .
It has also been determined that the coordinates of the center of the Sun are (1560,0) .
Chapter 8 Solutions
PRECALCULUS:GRAPHICAL,...-NASTA ED.
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