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Check whether the followings are null, spacelike or timelike [closed]

–2 votes
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(a)
$x^0=\int r^2+z^2d\tau$
$x^1=\int r\sin\theta d\tau$
$x^2=\int r\cos\theta d\tau$
$x^3=\int z d \tau$
(b)
$x^0= \sqrt3 ct$
$x^1=ct$
$x^2=ct_0 \sin(t/t_0)$
$x^3=ct_0 \cos(t/t_0)$
where $t_0$ is constant.

closed with the note: No effort.
asked Dec 9, 2018 in Physics Problems by GB (120 points)
closed Dec 24, 2018 by sammy gerbil
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