A spacecraft with a proper length of 300 m passes by an AMT observer o

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A spacecraft with a proper length of 300 m passes by an AMT observer on the Earth. According to this observer, it takes 0.750 μs for the spacecraft to pass a fixed point. Determine the speed of the spacecraft as measured by the Earth-based observer. A spacecraft with a proper length of Lp passes by an observer S on the Earth. According to this observer, it takes a time interval Δt for the spacecraft to pass a fixed point. Determine the speed of the object as measured by the Earth-based observer.

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A spacecraft with a proper length of $300 m$ passes by an AMT observer on the Earth. According to this observer, it takes T $0.750 μ s$ for the spacecraft to pass a fixed point. Determine the speed of the spacecraft as measured by the Earth-based observer.
A spacecraft with a proper length of $L_{p}$ passes by an observer $S$ on the Earth. According to this observer, it takes a time interval $Δ t$ for the spacecraft to pass a fixed point. Determine the speed of the object as measured by the Earthbased observer.