20. Suppose the AC voltage from power company is 17,000 V. Two transformers are used to step down the voltage. The first transformer has 5000 turns in the primary coil and 250 turns in the secondary coil; the second transformer has 4000 turns in the primary coil and 800 turns in the secondary coil. If the output of the first transformer is connected to the input of the second transformer, what will be the output of the second transformer? a. 120 V b. 1700 V c. 170 V d. 1200 V

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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.