Universe: Stars And Galaxies
Universe: Stars And Galaxies
6th Edition
ISBN: 9781319115098
Author: Roger Freedman, Robert Geller, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 3, Problem 18Q
To determine

(a)

The time, the moon takes to move through an angle equal to its angular diameter against the background of stars.

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If city is located in 2.8° north latitude and 46.0° east longitude. From there, you want to fly to a city in 7° north latitude and 52° east longitude. How much is the arc length of the big circle at 11000 m when the earth's radius is 6370 km? The arc length is 14223 km. Give your answer rounded to one kilmetre. Your last answer was interpreted as follows: 14223 XAnswer is incorrect. Keep centre of Earth as origin and define vectors to cities. Try again.
This was somewhat helpful, but my radius is not 3.5km it's 5km. This is not the answer to my question, it is only similar to it. I can not interpret your handwriting to follow along to answer for my question.
A planet's speed in orbit is given by     V = (30 km/s)[(2/r)-(1/a)]0.5   where V is the planet's velocity, r is the distance in AU's from the Sun at that instant, and a is the semimajor axis of its orbit.  Calculate the Earth's velocity in its orbit (assume it is circular):        What is the velocity of Mars at a distance of 1.41 AU from the Sun?       What is the spacecraft's velocity when it is 1 AU from the Sun (after launch from the Earth)?       What additional velocity does the launch burn have to give to the spacecraft? (i.e. What is the difference between the Earth's velocity and the velocity the spacecraft needs to have?)        How fast will the spacecraft be traveling when it reaches Mars?       Does the spacecraft need to gain or lose velocity to go into the same orbit as Mars?
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