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An airplane has a length of 60 $\mathrm{m}$ when measured at rest. Whenthe airplane is moving at 180 $\mathrm{m} / \mathrm{s}(400 \mathrm{mph})$ in the alternate uni-verse, how long would it appear to be to a stationary observer?A. 24 $\mathrm{m}$B. 36 $\mathrm{m}$C. 48 $\mathrm{m}$D. 60 $\mathrm{m}$E. 75 $\mathrm{m}$

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$$=48 \mathrm{m}$$

Physics 101 Mechanics

Chapter 27

Relativity

Gravitation

Cornell University

University of Michigan - Ann Arbor

University of Sheffield

Lectures

03:55

In physics, orbital motion is the motion of an object around another object, which is often a star or planet. Orbital motion is affected by the gravity of the central object, as well as by the resistance of deep space (which is negligible at the distances of most orbits in the Solar System).

03:18

Sir Isaac Newton described the law of universal gravitation in his work "Philosophiæ Naturalis Principia Mathematica" (1687). The law states that every point mass attracts every single other point mass by a force pointing along the line intersecting both points. The force is proportional to the product of the two masses and inversely proportional to the square of the distance between them.

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An airplane has a length o…

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An airplane has rest lengt…

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An airplane flies from San…

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An aeroplane was flying at…

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A plane is sitting on a ru…

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A ground-based observer me…

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An airplane, flying horizo…

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An airplane starts from re…

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How fast must a plane $50 …

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A spaceship is moving at a…

Okay, So we know from the previous question that the speed of light in the alternate universe is just 300 meters per second. And if we want to calculate how long will be the Yeah, Deac cling moving that's 100 moving with a speed off 180 meters per second. We just need to use the length contraction formula, which should be l equals l zero. The multiplies one minus V divided by CVS Crash C square All this in this crab rich. So if we use this formula, we can see that we have the l zero, which is the real length off the off the airplane. 60 meters. So we have l equals 60 multiplies one miners one 80 divided by 300 a square in this crab ridge. So if we calculated this, we're going to get for the lens. Ah, 48 meters already eight meters. So the correct alternative is alternative. See, that's all. Thanks for watching

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