Satellite Motion: Speed & Centripetal Accel.

[tjcreamer9]

An Earth satellite moves in a circular orbit 690 km above the Earth's surface. The period of the motion is 98.4 min.
(a) What is the speed of the satellite?
in m/s
(b) What is the magnitude of the centripetal acceleration of the satellite?

 

[hage567]

You need to show some effort to get help. What have you tried so far?

 

[tjcreamer9]

first i converted to meters...radius now equals 690000m. and converted 98.4 min to 5904 sec.
2pi 690000/ 111.667
i plugged that into the answer and was told that i had done it wrong.
i also came up wit 734 and 34 I am extremely confused

 

[hage567]

first i converted to meters...radius now equals 690000m. and converted 98.4 min to 5904 sec.
2pi 690000/ 111.667
i plugged that into the answer and was told that i had done it wrong.
i also came up wit 734 and 34 I am extremely confused

The satellite is 690 km above the surface of the earth. What is its distance from the centre of the earth? That's what the radius of the orbit is.