## Beyond Einstein's Unified Field: Gravity & Electro-Magnetism

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The second observer has constant velocity v 21 relative to the first, and measures the object to have velocity v 2 = v 1 − v 21. dv 2 dv 1 =. dt dt This is the same as that measured by the first observer. P11.5 P11.6 The cross-product vector must be perpendicular to both of the factors, so its dot product with either factor must be zero: e je j Does 2 i − 3 j + 4k ⋅ 4i + 3 j − k = 0?...