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What is so important about quadratics? |
2008-11-29 |
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zoe pose la question :
what is so important about quadratics?
Harley Weston lui répond. |
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A surveillance satellite |
2008-09-04 |
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Rita pose la question :
A surveillance satellite circles Earth at a height of h miles above the surface. Suppose that d is the distance, in miles, on the surface of Earth that can be observed from the satellite.
(a) Find an equation that relates the central angle theta to the height h.
(b) Find an equation that relates the observable distance d and theta.
(c) Find an equation that relates d and h.
Penny Nom lui répond. |
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How high is the satellite above the earth? |
2006-11-13 |
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Naomi pose la question :
If the linear speed of a satellite in synchronous orbit is 1000 mi/h, how high is the satellite above the earth?
Stephen La Rocque lui répond. |
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The radius of a planet |
2001-07-30 |
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Jessica pose la question :
A satellite is orbiting the earth at an altitude of 100 miles. If the angle of depression from the satellite to the horizon is 50 degrees, what is the radius (to the nearest mile) of the planet?
Harley Weston lui répond. |
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Networks of satellites and linear spaces |
2000-12-08 |
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David pose la question :
Let us suppose some companies have collaborated to place several satellites in orbit. Let us call the set of all satellites that a given company helped place in orbit a network. Finally let us assume the following 4 rules. - There are at least two distinct satellites.
- For each pair of satellites there is exactly one network containing them.
- Each network contains at least two distinct satellites.
- For each network, there is a satellite not in it.
What is the least number of satellites. what is the least number of networks?
Penny Nom lui répond. |
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Satellite dishes |
1999-02-10 |
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Katherine Shaw pose la question :
I have read your information on 'Why are satellite dishes parabolic", and I know the reciever should be placed at the focus of the parabola. Could you test this with lights beams and a parabolic mirror, or would light beams behave differently. Thanks.
Jack LeSage and Harley Weston lui répond. |
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