When an astronaut experiences weightlessness in deep outer space,  is she at equilibrium?  She may be stationary with respect to her spaceship, and at the same time traveling at a high speed with respect to the stars. Which law of motion offers explanation to this situation? Is she also massless?

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Q: 3. Ten resistors, each having a resistance of 12 Ohms, are arranged in series parallel combinations ...

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Q: What is the physical meaning of the slope?

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Q: What is the ratio(in lowest terms) of the magnitudes of charges q1 and q2? q1/q2 = 92

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Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.