Amolniya orbit is a highly eccentric orbit of a communication satellite so as to provide continuous communications coverage for scandinavian countries and adjacent russia. the orbit is positioned so that these countries have the satellite in view for extended periods in time (see below). if a satellite in such an orbit has an apogee at 48,000.0 km as measured from the center of earth and a velocity at apogee of 3.7 km/s, what would be its velocity (in km/s) at perigee measured at 740.0 km altitude? (enter the magnitude.)

The velocity of the satellite at the perigee is .

Explanation:

The velocity of the satellite at the perigee can be found by means of the angular momentum:

 (1)

Since there is no torque acting on the system, it can be express in the following  way:

  (2)

Replacing equation 1 in equation 2 it is gotten:

 (3)

Where m is the mass of the comet, is the orbital radius at the apogee, is the speed at the apogee, is the orbital radius at the perigee and is the speed at the perigee.        

From equation 3 will be isolated:    

 (4)

Before using equation 4 it is necessary to found the orbital radius of the satellite at the perigee, that can be determined from the sum of the Earth's radius and the height of the satellite above the surface at this point (740.0 km).

Finally, equation 4 can be used:

Hence, the velocity of the satellite at the perigee is .

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form