A satellite with a mass of 1000 kg is placed in Earth orbit at an orbit of 500 km above the surface. Assuming a circular orbit, a)  How long does the satellite take to complete one orbit? b)  What is the satellite’s orbital speed? c)  What is the minimum energy necessary to place this satellite in orbit (assume there is no air resistance)? d)  For how many miles would this energy power an automobile? (Assume 1 gal. of gasoline produces 1.1*108 J of energy, and this energy is sufficient to operate a car for 25 miles)

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Relativistic Energy and Momentum

According to classical physics, time flow is the same for every observer. But according to einstein's theory, time flow is different for different observers. The idea that time flow is not the same for all may sound strange because we may not experience this effect in everyday life. This effect is only observed when an object moves with some velocity comparable to the velocity of light. This velocity is termed relativistic velocity.