The spin-drier of a washing machine revolving at 900.RPM slows down uniformly to 300.RPM while making 60. revolutions. Find the
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Answer:
proper time taken by the person is 9.911 × 10⁻⁵ s
Explanation:
speed of the person in x- direction = 40,000 km/s
= 40,000 × 10³ m/s
= 4 × 10⁷ m/s
when the person just passes the street lamp is switched on which is at x =4 km
Lorentz factor =
=
= 1.009
time taken in your frame of reference,t =
=
proper time =
hence, proper time taken by the person is 9.911 × 10⁻⁵ s