Show that a covariant definition of the energy (valid in any reference frame) is E = -P#Uµ. (This involves an inner product between four-vectors, an invariant quantity. Is there a partic- ular reference frame that simplifies the expression?) dra dra = y (c, u) dt Uª dī
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Q: How much energy in terms of U is stored when spring is compress twice as much?
A: Given information: The compression in the spring = x0 The potential energy stored in the spring = U0
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