What is the kinetic energy of a 200 kg satellite as it follows a circular orbit of radius 8x106m around the earth?

Kinetic energy of satellite will be 4.98 × 10^9 J.

Explanation:

The velocity V of a satellite orbiting around the earth is given by  

                            V = √(GM/r)    ………. (i)

Where,  

G = gravitational constant = 6.67 × 10^-11 Nm^2/kg^2

M = mass of earth = 5.97 × 10^24 kg

r = radius of orbit = 8 × 10^6 m

By putting values in  equation (i),

                              V = √((6.67 × 10^-11)(5.97 × 10^24)/ 8 × 10^6)    

                              V = 7055.13 m/s

We know that,  

                            Kinetic energy = ½ mV^2

Where,

m = mass of satellite  

so,

                           Kinetic energy = ½ (200)(7055.13)^2

                           Kinetic energy = 4.98 × 10^9 J

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

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